diff --git a/tests/test_kms/test_kms_boto3.py b/tests/test_kms/test_kms_boto3.py
index 20bae139c..b5814e27d 100644
--- a/tests/test_kms/test_kms_boto3.py
+++ b/tests/test_kms/test_kms_boto3.py
@@ -9,7 +9,6 @@ import os
 
 import boto3
 import botocore.exceptions
-import sure  # noqa # pylint: disable=unused-import
 from botocore.exceptions import ClientError
 from freezegun import freeze_time
 import pytest
@@ -37,10 +36,10 @@ def test_create_key_without_description():
     conn = boto3.client("kms", region_name="us-east-1")
     metadata = conn.create_key(Policy="my policy")["KeyMetadata"]
 
-    metadata.should.have.key("AWSAccountId").equals(ACCOUNT_ID)
-    metadata.should.have.key("KeyId")
-    metadata.should.have.key("Arn")
-    metadata.should.have.key("Description").equal("")
+    assert metadata["AWSAccountId"] == ACCOUNT_ID
+    assert "KeyId" in metadata
+    assert "Arn" in metadata
+    assert metadata["Description"] == ""
 
 
 @mock_kms
@@ -53,58 +52,56 @@ def test_create_key():
         Tags=[{"TagKey": "project", "TagValue": "moto"}],
     )
 
-    key["KeyMetadata"]["Arn"].should.equal(
-        f"arn:aws:kms:us-east-1:{ACCOUNT_ID}:key/{key['KeyMetadata']['KeyId']}"
+    assert (
+        key["KeyMetadata"]["Arn"]
+        == f"arn:aws:kms:us-east-1:{ACCOUNT_ID}:key/{key['KeyMetadata']['KeyId']}"
     )
-    key["KeyMetadata"]["AWSAccountId"].should.equal(ACCOUNT_ID)
-    key["KeyMetadata"]["CreationDate"].should.be.a(datetime)
-    key["KeyMetadata"]["CustomerMasterKeySpec"].should.equal("SYMMETRIC_DEFAULT")
-    key["KeyMetadata"]["KeySpec"].should.equal("SYMMETRIC_DEFAULT")
-    key["KeyMetadata"]["Description"].should.equal("my key")
-    key["KeyMetadata"]["Enabled"].should.equal(True)
-    key["KeyMetadata"]["EncryptionAlgorithms"].should.equal(["SYMMETRIC_DEFAULT"])
-    key["KeyMetadata"]["KeyId"].should.match("[-a-zA-Z0-9]+")
-    key["KeyMetadata"]["KeyManager"].should.equal("CUSTOMER")
-    key["KeyMetadata"]["KeyState"].should.equal("Enabled")
-    key["KeyMetadata"]["KeyUsage"].should.equal("ENCRYPT_DECRYPT")
-    key["KeyMetadata"]["Origin"].should.equal("AWS_KMS")
-    key["KeyMetadata"].should_not.have.key("SigningAlgorithms")
+    assert key["KeyMetadata"]["AWSAccountId"] == ACCOUNT_ID
+    assert key["KeyMetadata"]["CustomerMasterKeySpec"] == "SYMMETRIC_DEFAULT"
+    assert key["KeyMetadata"]["KeySpec"] == "SYMMETRIC_DEFAULT"
+    assert key["KeyMetadata"]["Description"] == "my key"
+    assert key["KeyMetadata"]["Enabled"] is True
+    assert key["KeyMetadata"]["EncryptionAlgorithms"] == ["SYMMETRIC_DEFAULT"]
+    assert key["KeyMetadata"]["KeyManager"] == "CUSTOMER"
+    assert key["KeyMetadata"]["KeyState"] == "Enabled"
+    assert key["KeyMetadata"]["KeyUsage"] == "ENCRYPT_DECRYPT"
+    assert key["KeyMetadata"]["Origin"] == "AWS_KMS"
+    assert "SigningAlgorithms" not in key["KeyMetadata"]
 
     key = conn.create_key(KeyUsage="ENCRYPT_DECRYPT", KeySpec="RSA_2048")
 
-    sorted(key["KeyMetadata"]["EncryptionAlgorithms"]).should.equal(
-        ["RSAES_OAEP_SHA_1", "RSAES_OAEP_SHA_256"]
-    )
-    key["KeyMetadata"].should_not.have.key("SigningAlgorithms")
+    assert sorted(key["KeyMetadata"]["EncryptionAlgorithms"]) == [
+        "RSAES_OAEP_SHA_1",
+        "RSAES_OAEP_SHA_256",
+    ]
+    assert "SigningAlgorithms" not in key["KeyMetadata"]
 
     key = conn.create_key(KeyUsage="SIGN_VERIFY", KeySpec="RSA_2048")
 
-    key["KeyMetadata"].should_not.have.key("EncryptionAlgorithms")
-    sorted(key["KeyMetadata"]["SigningAlgorithms"]).should.equal(
-        [
-            "RSASSA_PKCS1_V1_5_SHA_256",
-            "RSASSA_PKCS1_V1_5_SHA_384",
-            "RSASSA_PKCS1_V1_5_SHA_512",
-            "RSASSA_PSS_SHA_256",
-            "RSASSA_PSS_SHA_384",
-            "RSASSA_PSS_SHA_512",
-        ]
-    )
+    assert "EncryptionAlgorithms" not in key["KeyMetadata"]
+    assert sorted(key["KeyMetadata"]["SigningAlgorithms"]) == [
+        "RSASSA_PKCS1_V1_5_SHA_256",
+        "RSASSA_PKCS1_V1_5_SHA_384",
+        "RSASSA_PKCS1_V1_5_SHA_512",
+        "RSASSA_PSS_SHA_256",
+        "RSASSA_PSS_SHA_384",
+        "RSASSA_PSS_SHA_512",
+    ]
 
     key = conn.create_key(KeyUsage="SIGN_VERIFY", KeySpec="ECC_SECG_P256K1")
 
-    key["KeyMetadata"].should_not.have.key("EncryptionAlgorithms")
-    key["KeyMetadata"]["SigningAlgorithms"].should.equal(["ECDSA_SHA_256"])
+    assert "EncryptionAlgorithms" not in key["KeyMetadata"]
+    assert key["KeyMetadata"]["SigningAlgorithms"] == ["ECDSA_SHA_256"]
 
     key = conn.create_key(KeyUsage="SIGN_VERIFY", KeySpec="ECC_NIST_P384")
 
-    key["KeyMetadata"].should_not.have.key("EncryptionAlgorithms")
-    key["KeyMetadata"]["SigningAlgorithms"].should.equal(["ECDSA_SHA_384"])
+    assert "EncryptionAlgorithms" not in key["KeyMetadata"]
+    assert key["KeyMetadata"]["SigningAlgorithms"] == ["ECDSA_SHA_384"]
 
     key = conn.create_key(KeyUsage="SIGN_VERIFY", KeySpec="ECC_NIST_P521")
 
-    key["KeyMetadata"].should_not.have.key("EncryptionAlgorithms")
-    key["KeyMetadata"]["SigningAlgorithms"].should.equal(["ECDSA_SHA_512"])
+    assert "EncryptionAlgorithms" not in key["KeyMetadata"]
+    assert key["KeyMetadata"]["SigningAlgorithms"] == ["ECDSA_SHA_512"]
 
 
 @mock_kms
@@ -118,8 +115,8 @@ def test_create_multi_region_key():
         Tags=[{"TagKey": "project", "TagValue": "moto"}],
     )
 
-    key["KeyMetadata"]["KeyId"].should.match("^mrk-")
-    key["KeyMetadata"]["MultiRegion"].should.equal(True)
+    assert key["KeyMetadata"]["KeyId"].startswith("mrk-")
+    assert key["KeyMetadata"]["MultiRegion"] is True
 
 
 @mock_kms
@@ -133,8 +130,8 @@ def test_non_multi_region_keys_should_not_have_multi_region_properties():
         Tags=[{"TagKey": "project", "TagValue": "moto"}],
     )
 
-    key["KeyMetadata"]["KeyId"].should_not.match("^mrk-")
-    key["KeyMetadata"]["MultiRegion"].should.equal(False)
+    assert not key["KeyMetadata"]["KeyId"].startswith("mrk-")
+    assert key["KeyMetadata"]["MultiRegion"] is False
 
 
 @mock_kms
@@ -169,11 +166,11 @@ def test_create_key_deprecated_master_custom_key_spec():
     conn = boto3.client("kms", region_name="us-east-1")
     key = conn.create_key(KeyUsage="SIGN_VERIFY", CustomerMasterKeySpec="ECC_NIST_P521")
 
-    key["KeyMetadata"].should_not.have.key("EncryptionAlgorithms")
-    key["KeyMetadata"]["SigningAlgorithms"].should.equal(["ECDSA_SHA_512"])
+    assert "EncryptionAlgorithms" not in key["KeyMetadata"]
+    assert key["KeyMetadata"]["SigningAlgorithms"] == ["ECDSA_SHA_512"]
 
-    key["KeyMetadata"]["CustomerMasterKeySpec"].should.equal("ECC_NIST_P521")
-    key["KeyMetadata"]["KeySpec"].should.equal("ECC_NIST_P521")
+    assert key["KeyMetadata"]["CustomerMasterKeySpec"] == "ECC_NIST_P521"
+    assert key["KeyMetadata"]["KeySpec"] == "ECC_NIST_P521"
 
 
 @pytest.mark.parametrize("id_or_arn", ["KeyId", "Arn"])
@@ -185,19 +182,18 @@ def test_describe_key(id_or_arn):
 
     response = client.describe_key(KeyId=key_id)
 
-    response["KeyMetadata"]["AWSAccountId"].should.equal("123456789012")
-    response["KeyMetadata"]["CreationDate"].should.be.a(datetime)
-    response["KeyMetadata"]["CustomerMasterKeySpec"].should.equal("SYMMETRIC_DEFAULT")
-    response["KeyMetadata"]["KeySpec"].should.equal("SYMMETRIC_DEFAULT")
-    response["KeyMetadata"]["Description"].should.equal("my key")
-    response["KeyMetadata"]["Enabled"].should.equal(True)
-    response["KeyMetadata"]["EncryptionAlgorithms"].should.equal(["SYMMETRIC_DEFAULT"])
-    response["KeyMetadata"]["KeyId"].should.match("[-a-zA-Z0-9]+")
-    response["KeyMetadata"]["KeyManager"].should.equal("CUSTOMER")
-    response["KeyMetadata"]["KeyState"].should.equal("Enabled")
-    response["KeyMetadata"]["KeyUsage"].should.equal("ENCRYPT_DECRYPT")
-    response["KeyMetadata"]["Origin"].should.equal("AWS_KMS")
-    response["KeyMetadata"].should_not.have.key("SigningAlgorithms")
+    assert response["KeyMetadata"]["AWSAccountId"] == "123456789012"
+    assert response["KeyMetadata"]["CreationDate"] is not None
+    assert response["KeyMetadata"]["CustomerMasterKeySpec"] == "SYMMETRIC_DEFAULT"
+    assert response["KeyMetadata"]["KeySpec"] == "SYMMETRIC_DEFAULT"
+    assert response["KeyMetadata"]["Description"] == "my key"
+    assert response["KeyMetadata"]["Enabled"] is True
+    assert response["KeyMetadata"]["EncryptionAlgorithms"] == ["SYMMETRIC_DEFAULT"]
+    assert response["KeyMetadata"]["KeyManager"] == "CUSTOMER"
+    assert response["KeyMetadata"]["KeyState"] == "Enabled"
+    assert response["KeyMetadata"]["KeyUsage"] == "ENCRYPT_DECRYPT"
+    assert response["KeyMetadata"]["Origin"] == "AWS_KMS"
+    assert "SigningAlgorithms" not in response["KeyMetadata"]
 
 
 @mock_kms
@@ -210,21 +206,19 @@ def test_get_key_policy_default():
     policy = client.get_key_policy(KeyId=key_id, PolicyName="default")["Policy"]
 
     # then
-    json.loads(policy).should.equal(
-        {
-            "Version": "2012-10-17",
-            "Id": "key-default-1",
-            "Statement": [
-                {
-                    "Sid": "Enable IAM User Permissions",
-                    "Effect": "Allow",
-                    "Principal": {"AWS": f"arn:aws:iam::{ACCOUNT_ID}:root"},
-                    "Action": "kms:*",
-                    "Resource": "*",
-                }
-            ],
-        }
-    )
+    assert json.loads(policy) == {
+        "Version": "2012-10-17",
+        "Id": "key-default-1",
+        "Statement": [
+            {
+                "Sid": "Enable IAM User Permissions",
+                "Effect": "Allow",
+                "Principal": {"AWS": f"arn:aws:iam::{ACCOUNT_ID}:root"},
+                "Action": "kms:*",
+                "Resource": "*",
+            }
+        ],
+    }
 
 
 @mock_kms
@@ -235,7 +229,7 @@ def test_describe_key_via_alias():
     client.create_alias(AliasName="alias/my-alias", TargetKeyId=key_id)
 
     alias_key = client.describe_key(KeyId="alias/my-alias")
-    alias_key["KeyMetadata"]["Description"].should.equal("my key")
+    assert alias_key["KeyMetadata"]["Description"] == "my key"
 
 
 @mock_kms
@@ -251,9 +245,11 @@ def test__create_alias__can_create_multiple_aliases_for_same_key_id():
 
     for name in alias_names:
         alias_arn = f"arn:aws:kms:us-east-1:{ACCOUNT_ID}:{name}"
-        aliases.should.contain(
-            {"AliasName": name, "AliasArn": alias_arn, "TargetKeyId": key_id}
-        )
+        assert {
+            "AliasName": name,
+            "AliasArn": alias_arn,
+            "TargetKeyId": key_id,
+        } in aliases
 
 
 @mock_kms
@@ -271,14 +267,16 @@ def test_list_aliases():
     default_alias_names = list(default_alias_target_keys.keys())
 
     aliases = client.list_aliases()["Aliases"]
-    aliases.should.have.length_of(14)
+    assert len(aliases) == 14
     for name in default_alias_names:
         full_name = f"alias/{name}"
         arn = f"arn:aws:kms:{region}:{ACCOUNT_ID}:{full_name}"
         target_key_id = default_alias_target_keys[name]
-        aliases.should.contain(
-            {"AliasName": full_name, "AliasArn": arn, "TargetKeyId": target_key_id}
-        )
+        assert {
+            "AliasName": full_name,
+            "AliasArn": arn,
+            "TargetKeyId": target_key_id,
+        } in aliases
 
 
 @mock_kms
@@ -292,10 +290,12 @@ def test_list_aliases_for_key_id():
     client.create_alias(AliasName=my_alias, TargetKeyId=key_id)
 
     aliases = client.list_aliases(KeyId=key_id)["Aliases"]
-    aliases.should.have.length_of(1)
-    aliases.should.contain(
-        {"AliasName": my_alias, "AliasArn": alias_arn, "TargetKeyId": key_id}
-    )
+    assert len(aliases) == 1
+    assert {
+        "AliasName": my_alias,
+        "AliasArn": alias_arn,
+        "TargetKeyId": key_id,
+    } in aliases
 
 
 @mock_kms
@@ -312,12 +312,14 @@ def test_list_aliases_for_key_arn():
     client.create_alias(AliasName=arn_alias, TargetKeyId=key_arn)
 
     aliases = client.list_aliases(KeyId=key_arn)["Aliases"]
-    aliases.should.have.length_of(2)
+    assert len(aliases) == 2
     for alias in [id_alias, arn_alias]:
         alias_arn = f"arn:aws:kms:{region}:{ACCOUNT_ID}:{alias}"
-        aliases.should.contain(
-            {"AliasName": alias, "AliasArn": alias_arn, "TargetKeyId": key_id}
-        )
+        assert {
+            "AliasName": alias,
+            "AliasArn": alias_arn,
+            "TargetKeyId": key_id,
+        } in aliases
 
 
 @pytest.mark.parametrize(
@@ -344,9 +346,9 @@ def test_list_keys():
         k2 = client.create_key(Description="key2")["KeyMetadata"]
 
     keys = client.list_keys()["Keys"]
-    keys.should.have.length_of(2)
-    keys.should.contain({"KeyId": k1["KeyId"], "KeyArn": k1["Arn"]})
-    keys.should.contain({"KeyId": k2["KeyId"], "KeyArn": k2["Arn"]})
+    assert len(keys) == 2
+    assert {"KeyId": k1["KeyId"], "KeyArn": k1["Arn"]} in keys
+    assert {"KeyId": k2["KeyId"], "KeyArn": k2["Arn"]} in keys
 
 
 @pytest.mark.parametrize("id_or_arn", ["KeyId", "Arn"])
@@ -355,19 +357,13 @@ def test_enable_key_rotation(id_or_arn):
     client = boto3.client("kms", region_name="us-east-1")
     key_id = create_simple_key(client, id_or_arn=id_or_arn)
 
-    client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"].should.equal(
-        False
-    )
+    assert client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"] is False
 
     client.enable_key_rotation(KeyId=key_id)
-    client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"].should.equal(
-        True
-    )
+    assert client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"] is True
 
     client.disable_key_rotation(KeyId=key_id)
-    client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"].should.equal(
-        False
-    )
+    assert client.get_key_rotation_status(KeyId=key_id)["KeyRotationEnabled"] is False
 
 
 @mock_kms
@@ -379,8 +375,8 @@ def test_enable_key_rotation_with_alias_name_should_fail():
     with pytest.raises(ClientError) as ex:
         client.enable_key_rotation(KeyId="alias/my-alias")
     err = ex.value.response["Error"]
-    err["Code"].should.equal("NotFoundException")
-    err["Message"].should.equal("Invalid keyId alias/my-alias")
+    assert err["Code"] == "NotFoundException"
+    assert err["Message"] == "Invalid keyId alias/my-alias"
 
 
 @mock_kms
@@ -400,7 +396,7 @@ def test_generate_data_key():
     with pytest.raises(Exception):
         base64.b64decode(response["Plaintext"], validate=True)
 
-    response["KeyId"].should.equal(key_arn)
+    assert response["KeyId"] == key_arn
 
 
 @pytest.mark.parametrize(
@@ -567,20 +563,20 @@ def test_unknown_tag_methods():
     with pytest.raises(ClientError) as ex:
         client.tag_resource(KeyId="unknown", Tags=[])
     err = ex.value.response["Error"]
-    err["Message"].should.equal("Invalid keyId unknown")
-    err["Code"].should.equal("NotFoundException")
+    assert err["Message"] == "Invalid keyId unknown"
+    assert err["Code"] == "NotFoundException"
 
     with pytest.raises(ClientError) as ex:
         client.untag_resource(KeyId="unknown", TagKeys=[])
     err = ex.value.response["Error"]
-    err["Message"].should.equal("Invalid keyId unknown")
-    err["Code"].should.equal("NotFoundException")
+    assert err["Message"] == "Invalid keyId unknown"
+    assert err["Code"] == "NotFoundException"
 
     with pytest.raises(ClientError) as ex:
         client.list_resource_tags(KeyId="unknown")
     err = ex.value.response["Error"]
-    err["Message"].should.equal("Invalid keyId unknown")
-    err["Code"].should.equal("NotFoundException")
+    assert err["Message"] == "Invalid keyId unknown"
+    assert err["Code"] == "NotFoundException"
 
 
 @mock_kms
@@ -599,7 +595,7 @@ def test_list_resource_tags_after_untagging():
     client.untag_resource(KeyId=key_id, TagKeys=["key2"])
 
     tags = client.list_resource_tags(KeyId=key_id)["Tags"]
-    tags.should.equal([{"TagKey": "key1", "TagValue": "s1"}])
+    assert tags == [{"TagKey": "key1", "TagValue": "s1"}]
 
 
 @pytest.mark.parametrize(
@@ -691,9 +687,7 @@ def test_generate_data_key_all_valid_key_ids(prefix, append_key_id):
         target_id += key_id
 
     resp = client.generate_data_key(KeyId=target_id, NumberOfBytes=32)
-    resp.should.have.key("KeyId").equals(
-        f"arn:aws:kms:us-east-1:123456789012:key/{key_id}"
-    )
+    assert resp["KeyId"] == f"arn:aws:kms:us-east-1:123456789012:key/{key_id}"
 
 
 @mock_kms
@@ -715,8 +709,8 @@ def test_generate_random(number_of_bytes):
 
     response = client.generate_random(NumberOfBytes=number_of_bytes)
 
-    response["Plaintext"].should.be.a(bytes)
-    len(response["Plaintext"]).should.equal(number_of_bytes)
+    assert isinstance(response["Plaintext"], bytes)
+    assert len(response["Plaintext"]) == number_of_bytes
 
 
 @pytest.mark.parametrize(
@@ -828,7 +822,7 @@ def test_get_key_policy(id_or_arn):
     #   PolicyName: Specifies the name of the key policy. The only valid name is default .
     # But.. why.
     response = client.get_key_policy(KeyId=key_id, PolicyName="default")
-    response["Policy"].should.equal("my awesome key policy")
+    assert response["Policy"] == "my awesome key policy"
 
 
 @pytest.mark.parametrize("id_or_arn", ["KeyId", "Arn"])
@@ -840,7 +834,7 @@ def test_put_key_policy(id_or_arn):
     client.put_key_policy(KeyId=key_id, PolicyName="default", Policy="policy 2.0")
 
     response = client.get_key_policy(KeyId=key_id, PolicyName="default")
-    response["Policy"].should.equal("policy 2.0")
+    assert response["Policy"] == "policy 2.0"
 
 
 @mock_kms
@@ -854,11 +848,11 @@ def test_put_key_policy_using_alias_shouldnt_work():
             KeyId="alias/my-alias", PolicyName="default", Policy="policy 2.0"
         )
     err = ex.value.response["Error"]
-    err["Code"].should.equal("NotFoundException")
-    err["Message"].should.equal("Invalid keyId alias/my-alias")
+    assert err["Code"] == "NotFoundException"
+    assert err["Message"] == "Invalid keyId alias/my-alias"
 
     response = client.get_key_policy(KeyId=key_id, PolicyName="default")
-    response["Policy"].should.equal("my policy")
+    assert response["Policy"] == "my policy"
 
 
 @mock_kms
@@ -867,7 +861,7 @@ def test_list_key_policies():
     key_id = create_simple_key(client)
 
     policies = client.list_key_policies(KeyId=key_id)
-    policies["PolicyNames"].should.equal(["default"])
+    assert policies["PolicyNames"] == ["default"]
 
 
 @pytest.mark.parametrize(
@@ -882,8 +876,8 @@ def test__create_alias__raises_if_reserved_alias(reserved_alias):
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName=reserved_alias, TargetKeyId=key_id)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("NotAuthorizedException")
-    err["Message"].should.equal("")
+    assert err["Code"] == "NotAuthorizedException"
+    assert err["Message"] == ""
 
 
 @pytest.mark.parametrize(
@@ -897,9 +891,10 @@ def test__create_alias__raises_if_alias_has_restricted_characters(name):
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName=name, TargetKeyId=key_id)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        f"1 validation error detected: Value '{name}' at 'aliasName' failed to satisfy constraint: Member must satisfy regular expression pattern: ^[a-zA-Z0-9:/_-]+$"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == f"1 validation error detected: Value '{name}' at 'aliasName' failed to satisfy constraint: Member must satisfy regular expression pattern: ^[a-zA-Z0-9:/_-]+$"
     )
 
 
@@ -912,10 +907,8 @@ def test__create_alias__raises_if_alias_has_restricted_characters_semicolon():
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName="alias/my:alias", TargetKeyId=key_id)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "alias/my:alias contains invalid characters for an alias"
-    )
+    assert err["Code"] == "ValidationException"
+    assert err["Message"] == "alias/my:alias contains invalid characters for an alias"
 
 
 @pytest.mark.parametrize("name", ["alias/my-alias_/", "alias/my_alias-/"])
@@ -938,8 +931,8 @@ def test__create_alias__raises_if_target_key_id_is_existing_alias():
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName=name, TargetKeyId=name)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal("Aliases must refer to keys. Not aliases")
+    assert err["Code"] == "ValidationException"
+    assert err["Message"] == "Aliases must refer to keys. Not aliases"
 
 
 @mock_kms
@@ -950,8 +943,8 @@ def test__create_alias__raises_if_wrong_prefix():
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName="wrongprefix/my-alias", TargetKeyId=key_id)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal("Invalid identifier")
+    assert err["Code"] == "ValidationException"
+    assert err["Message"] == "Invalid identifier"
 
 
 @mock_kms
@@ -965,9 +958,10 @@ def test__create_alias__raises_if_duplicate():
     with pytest.raises(ClientError) as ex:
         client.create_alias(AliasName=alias, TargetKeyId=key_id)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("AlreadyExistsException")
-    err["Message"].should.equal(
-        f"An alias with the name arn:aws:kms:us-east-1:{ACCOUNT_ID}:alias/my-alias already exists"
+    assert err["Code"] == "AlreadyExistsException"
+    assert (
+        err["Message"]
+        == f"An alias with the name arn:aws:kms:us-east-1:{ACCOUNT_ID}:alias/my-alias already exists"
     )
 
 
@@ -994,8 +988,8 @@ def test__delete_alias__raises_if_wrong_prefix():
     with pytest.raises(ClientError) as ex:
         client.delete_alias(AliasName="wrongprefix/my-alias")
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal("Invalid identifier")
+    assert err["Code"] == "ValidationException"
+    assert err["Message"] == "Invalid identifier"
 
 
 @mock_kms
@@ -1005,9 +999,10 @@ def test__delete_alias__raises_if_alias_is_not_found():
     with pytest.raises(ClientError) as ex:
         client.delete_alias(AliasName="alias/unknown-alias")
     err = ex.value.response["Error"]
-    err["Code"].should.equal("NotFoundException")
-    err["Message"].should.equal(
-        f"Alias arn:aws:kms:us-east-1:{ACCOUNT_ID}:alias/unknown-alias is not found."
+    assert err["Code"] == "NotFoundException"
+    assert (
+        err["Message"]
+        == f"Alias arn:aws:kms:us-east-1:{ACCOUNT_ID}:alias/unknown-alias is not found."
     )
 
 
@@ -1091,9 +1086,9 @@ def test_sign_happy(plaintext):
         KeyId=key_id, Message=plaintext, SigningAlgorithm=signing_algorithm
     )
 
-    sign_response["Signature"].should_not.equal(plaintext)
-    sign_response["SigningAlgorithm"].should.equal(signing_algorithm)
-    sign_response["KeyId"].should.equal(key_arn)
+    assert sign_response["Signature"] != plaintext
+    assert sign_response["SigningAlgorithm"] == signing_algorithm
+    assert sign_response["KeyId"] == key_arn
 
 
 @mock_kms
@@ -1109,9 +1104,10 @@ def test_sign_invalid_signing_algorithm():
     with pytest.raises(ClientError) as ex:
         client.sign(KeyId=key_id, Message=message, SigningAlgorithm=signing_algorithm)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value 'INVALID' at 'SigningAlgorithm' failed to satisfy constraint: Member must satisfy enum value set: ['RSASSA_PKCS1_V1_5_SHA_256', 'RSASSA_PKCS1_V1_5_SHA_384', 'RSASSA_PKCS1_V1_5_SHA_512', 'RSASSA_PSS_SHA_256', 'RSASSA_PSS_SHA_384', 'RSASSA_PSS_SHA_512']"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value 'INVALID' at 'SigningAlgorithm' failed to satisfy constraint: Member must satisfy enum value set: ['RSASSA_PKCS1_V1_5_SHA_256', 'RSASSA_PKCS1_V1_5_SHA_384', 'RSASSA_PKCS1_V1_5_SHA_512', 'RSASSA_PSS_SHA_256', 'RSASSA_PSS_SHA_384', 'RSASSA_PSS_SHA_512']"
     )
 
 
@@ -1132,7 +1128,7 @@ def test_sign_and_verify_ignoring_grant_tokens():
         GrantTokens=["my-ignored-grant-token"],
     )
 
-    sign_response["Signature"].should_not.equal(message)
+    assert sign_response["Signature"] != message
 
     verify_response = client.verify(
         KeyId=key_id,
@@ -1142,7 +1138,7 @@ def test_sign_and_verify_ignoring_grant_tokens():
         GrantTokens=["my-ignored-grant-token"],
     )
 
-    verify_response["SignatureValid"].should.equal(True)
+    assert verify_response["SignatureValid"] is True
 
 
 @mock_kms
@@ -1172,7 +1168,7 @@ def test_sign_and_verify_digest_message_type_256():
         SigningAlgorithm=signing_algorithm,
     )
 
-    verify_response["SignatureValid"].should.equal(True)
+    assert verify_response["SignatureValid"] is True
 
 
 @mock_kms
@@ -1188,9 +1184,10 @@ def test_sign_invalid_key_usage():
     with pytest.raises(ClientError) as ex:
         client.sign(KeyId=key_id, Message=message, SigningAlgorithm=signing_algorithm)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        f"1 validation error detected: Value '{key_id}' at 'KeyId' failed to satisfy constraint: Member must point to a key with usage: 'SIGN_VERIFY'"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == f"1 validation error detected: Value '{key_id}' at 'KeyId' failed to satisfy constraint: Member must point to a key with usage: 'SIGN_VERIFY'"
     )
 
 
@@ -1207,9 +1204,10 @@ def test_sign_invalid_message():
     with pytest.raises(ClientError) as ex:
         client.sign(KeyId=key_id, Message=message, SigningAlgorithm=signing_algorithm)
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value at 'Message' failed to satisfy constraint: Member must have length greater than or equal to 1"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value at 'Message' failed to satisfy constraint: Member must have length greater than or equal to 1"
     )
 
 
@@ -1236,9 +1234,9 @@ def test_verify_happy(plaintext):
         SigningAlgorithm=signing_algorithm,
     )
 
-    verify_response["SigningAlgorithm"].should.equal(signing_algorithm)
-    verify_response["KeyId"].should.equal(key_arn)
-    verify_response["SignatureValid"].should.equal(True)
+    assert verify_response["SigningAlgorithm"] == signing_algorithm
+    assert verify_response["KeyId"] == key_arn
+    assert verify_response["SignatureValid"] is True
 
 
 @mock_kms
@@ -1257,9 +1255,9 @@ def test_verify_happy_with_invalid_signature():
         SigningAlgorithm=signing_algorithm,
     )
 
-    verify_response["SigningAlgorithm"].should.equal(signing_algorithm)
-    verify_response["KeyId"].should.equal(key_arn)
-    verify_response["SignatureValid"].should.equal(False)
+    assert verify_response["SigningAlgorithm"] == signing_algorithm
+    assert verify_response["KeyId"] == key_arn
+    assert verify_response["SignatureValid"] is False
 
 
 @mock_kms
@@ -1281,9 +1279,10 @@ def test_verify_invalid_signing_algorithm():
             SigningAlgorithm=signing_algorithm,
         )
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value 'INVALID' at 'SigningAlgorithm' failed to satisfy constraint: Member must satisfy enum value set: ['RSASSA_PKCS1_V1_5_SHA_256', 'RSASSA_PKCS1_V1_5_SHA_384', 'RSASSA_PKCS1_V1_5_SHA_512', 'RSASSA_PSS_SHA_256', 'RSASSA_PSS_SHA_384', 'RSASSA_PSS_SHA_512']"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value 'INVALID' at 'SigningAlgorithm' failed to satisfy constraint: Member must satisfy enum value set: ['RSASSA_PKCS1_V1_5_SHA_256', 'RSASSA_PKCS1_V1_5_SHA_384', 'RSASSA_PKCS1_V1_5_SHA_512', 'RSASSA_PSS_SHA_256', 'RSASSA_PSS_SHA_384', 'RSASSA_PSS_SHA_512']"
     )
 
 
@@ -1304,9 +1303,10 @@ def test_verify_invalid_message():
         )
 
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value at 'Message' failed to satisfy constraint: Member must have length greater than or equal to 1"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value at 'Message' failed to satisfy constraint: Member must have length greater than or equal to 1"
     )
 
 
@@ -1329,9 +1329,10 @@ def test_verify_empty_signature():
             SigningAlgorithm=signing_algorithm,
         )
     err = ex.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value at 'Signature' failed to satisfy constraint: Member must have length greater than or equal to 1"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value at 'Signature' failed to satisfy constraint: Member must have length greater than or equal to 1"
     )
 
 
@@ -1342,11 +1343,12 @@ def test_get_public_key():
     key_id = key["KeyMetadata"]["KeyId"]
     public_key_response = client.get_public_key(KeyId=key_id)
 
-    public_key_response.should.contain("PublicKey")
-    public_key_response["SigningAlgorithms"].should.equal(
-        key["KeyMetadata"]["SigningAlgorithms"]
+    assert "PublicKey" in public_key_response
+    assert (
+        public_key_response["SigningAlgorithms"]
+        == key["KeyMetadata"]["SigningAlgorithms"]
     )
-    public_key_response.shouldnt.contain("EncryptionAlgorithms")
+    assert "EncryptionAlgorithms" not in public_key_response
 
 
 def create_simple_key(client, id_or_arn="KeyId", description=None, policy=None):
diff --git a/tests/test_kms/test_kms_encrypt.py b/tests/test_kms/test_kms_encrypt.py
index a1b4c8aea..d745a3266 100644
--- a/tests/test_kms/test_kms_encrypt.py
+++ b/tests/test_kms/test_kms_encrypt.py
@@ -1,7 +1,6 @@
 import base64
 
 import boto3
-import sure  # noqa # pylint: disable=unused-import
 from botocore.exceptions import ClientError
 import pytest
 
@@ -16,9 +15,10 @@ def test_create_key_with_empty_content():
     with pytest.raises(ClientError) as exc:
         client_kms.encrypt(KeyId=metadata["KeyId"], Plaintext="")
     err = exc.value.response["Error"]
-    err["Code"].should.equal("ValidationException")
-    err["Message"].should.equal(
-        "1 validation error detected: Value at 'plaintext' failed to satisfy constraint: Member must have length greater than or equal to 1"
+    assert err["Code"] == "ValidationException"
+    assert (
+        err["Message"]
+        == "1 validation error detected: Value at 'plaintext' failed to satisfy constraint: Member must have length greater than or equal to 1"
     )
 
 
@@ -32,13 +32,13 @@ def test_encrypt(plaintext):
     key_arn = key["KeyMetadata"]["Arn"]
 
     response = client.encrypt(KeyId=key_id, Plaintext=plaintext)
-    response["CiphertextBlob"].should_not.equal(plaintext)
+    assert response["CiphertextBlob"] != plaintext
 
     # CiphertextBlob must NOT be base64-encoded
     with pytest.raises(Exception):
         base64.b64decode(response["CiphertextBlob"], validate=True)
 
-    response["KeyId"].should.equal(key_arn)
+    assert response["KeyId"] == key_arn
 
 
 @mock_kms
@@ -116,8 +116,8 @@ def test_decrypt(plaintext):
     with pytest.raises(Exception):
         base64.b64decode(decrypt_response["Plaintext"], validate=True)
 
-    decrypt_response["Plaintext"].should.equal(_get_encoded_value(plaintext))
-    decrypt_response["KeyId"].should.equal(key_arn)
+    assert decrypt_response["Plaintext"] == _get_encoded_value(plaintext)
+    assert decrypt_response["KeyId"] == key_arn
 
 
 @pytest.mark.parametrize("plaintext", PLAINTEXT_VECTORS)
@@ -128,7 +128,7 @@ def test_kms_encrypt(plaintext):
     response = client.encrypt(KeyId=key["KeyMetadata"]["KeyId"], Plaintext=plaintext)
 
     response = client.decrypt(CiphertextBlob=response["CiphertextBlob"])
-    response["Plaintext"].should.equal(_get_encoded_value(plaintext))
+    assert response["Plaintext"] == _get_encoded_value(plaintext)
 
 
 @pytest.mark.parametrize("plaintext", PLAINTEXT_VECTORS)
@@ -158,24 +158,24 @@ def test_re_encrypt_decrypt(plaintext):
     with pytest.raises(Exception):
         base64.b64decode(re_encrypt_response["CiphertextBlob"], validate=True)
 
-    re_encrypt_response["SourceKeyId"].should.equal(key_1_arn)
-    re_encrypt_response["KeyId"].should.equal(key_2_arn)
+    assert re_encrypt_response["SourceKeyId"] == key_1_arn
+    assert re_encrypt_response["KeyId"] == key_2_arn
 
     decrypt_response_1 = client.decrypt(
         CiphertextBlob=encrypt_response["CiphertextBlob"],
         EncryptionContext={"encryption": "context"},
     )
-    decrypt_response_1["Plaintext"].should.equal(_get_encoded_value(plaintext))
-    decrypt_response_1["KeyId"].should.equal(key_1_arn)
+    assert decrypt_response_1["Plaintext"] == _get_encoded_value(plaintext)
+    assert decrypt_response_1["KeyId"] == key_1_arn
 
     decrypt_response_2 = client.decrypt(
         CiphertextBlob=re_encrypt_response["CiphertextBlob"],
         EncryptionContext={"another": "context"},
     )
-    decrypt_response_2["Plaintext"].should.equal(_get_encoded_value(plaintext))
-    decrypt_response_2["KeyId"].should.equal(key_2_arn)
+    assert decrypt_response_2["Plaintext"] == _get_encoded_value(plaintext)
+    assert decrypt_response_2["KeyId"] == key_2_arn
 
-    decrypt_response_1["Plaintext"].should.equal(decrypt_response_2["Plaintext"])
+    assert decrypt_response_1["Plaintext"] == decrypt_response_2["Plaintext"]
 
 
 @mock_kms
diff --git a/tests/test_kms/test_kms_grants.py b/tests/test_kms/test_kms_grants.py
index 0a9575c5a..e1b11ab5d 100644
--- a/tests/test_kms/test_kms_grants.py
+++ b/tests/test_kms/test_kms_grants.py
@@ -1,5 +1,4 @@
 import boto3
-import sure  # noqa # pylint: disable=unused-import
 import pytest
 from cryptography.hazmat.primitives.asymmetric import rsa
 from unittest import mock
@@ -24,8 +23,8 @@ def test_create_grant():
         Operations=["DECRYPT"],
         Name="testgrant",
     )
-    resp.should.have.key("GrantId")
-    resp.should.have.key("GrantToken")
+    assert "GrantId" in resp
+    assert "GrantToken" in resp
 
 
 @mock_kms
@@ -33,7 +32,7 @@ def test_list_grants():
     client = boto3.client("kms", region_name="us-east-1")
     key_id = create_key(client)
 
-    client.list_grants(KeyId=key_id).should.have.key("Grants").equals([])
+    assert client.list_grants(KeyId=key_id)["Grants"] == []
 
     grant_id1 = client.create_grant(
         KeyId=key_id,
@@ -51,33 +50,33 @@ def test_list_grants():
 
     # List all
     grants = client.list_grants(KeyId=key_id)["Grants"]
-    grants.should.have.length_of(2)
+    assert len(grants) == 2
     grant_1 = [grant for grant in grants if grant["GrantId"] == grant_id1][0]
     grant_2 = [grant for grant in grants if grant["GrantId"] == grant_id2][0]
 
-    grant_1.should.have.key("KeyId").equals(key_id)
-    grant_1.should.have.key("GrantId").equals(grant_id1)
-    grant_1.should.have.key("Name").equals("testgrant")
-    grant_1.should.have.key("GranteePrincipal").equals(grantee_principal)
-    grant_1.should.have.key("Operations").equals(["DECRYPT"])
+    assert grant_1["KeyId"] == key_id
+    assert grant_1["GrantId"] == grant_id1
+    assert grant_1["Name"] == "testgrant"
+    assert grant_1["GranteePrincipal"] == grantee_principal
+    assert grant_1["Operations"] == ["DECRYPT"]
 
-    grant_2.should.have.key("KeyId").equals(key_id)
-    grant_2.should.have.key("GrantId").equals(grant_id2)
-    grant_2.shouldnt.have.key("Name")
-    grant_2.should.have.key("GranteePrincipal").equals(grantee_principal)
-    grant_2.should.have.key("Operations").equals(["DECRYPT", "ENCRYPT"])
-    grant_2.should.have.key("Constraints").equals(
-        {"EncryptionContextSubset": {"baz": "kaz", "foo": "bar"}}
-    )
+    assert grant_2["KeyId"] == key_id
+    assert grant_2["GrantId"] == grant_id2
+    assert "Name" not in grant_2
+    assert grant_2["GranteePrincipal"] == grantee_principal
+    assert grant_2["Operations"] == ["DECRYPT", "ENCRYPT"]
+    assert grant_2["Constraints"] == {
+        "EncryptionContextSubset": {"baz": "kaz", "foo": "bar"}
+    }
 
     # List by grant_id
     grants = client.list_grants(KeyId=key_id, GrantId=grant_id2)["Grants"]
-    grants.should.have.length_of(1)
-    grants[0]["GrantId"].should.equal(grant_id2)
+    assert len(grants) == 1
+    assert grants[0]["GrantId"] == grant_id2
 
     # List by unknown grant_id
     grants = client.list_grants(KeyId=key_id, GrantId="unknown")["Grants"]
-    grants.should.have.length_of(0)
+    assert len(grants) == 0
 
 
 @mock_kms
@@ -114,9 +113,9 @@ def test_list_retirable_grants():
 
     # List only the grants from the retiring principal
     grants = client.list_retirable_grants(RetiringPrincipal="principal")["Grants"]
-    grants.should.have.length_of(1)
-    grants[0]["KeyId"].should.equal(key_id2)
-    grants[0]["GrantId"].should.equal(grant2_key2)
+    assert len(grants) == 1
+    assert grants[0]["KeyId"] == key_id2
+    assert grants[0]["GrantId"] == grant2_key2
 
 
 @mock_kms
@@ -125,7 +124,7 @@ def test_revoke_grant():
     client = boto3.client("kms", region_name="us-east-1")
     key_id = create_key(client)
 
-    client.list_grants(KeyId=key_id).should.have.key("Grants").equals([])
+    assert client.list_grants(KeyId=key_id)["Grants"] == []
 
     grant_id = client.create_grant(
         KeyId=key_id,
@@ -136,7 +135,7 @@ def test_revoke_grant():
 
     client.revoke_grant(KeyId=key_id, GrantId=grant_id)
 
-    client.list_grants(KeyId=key_id)["Grants"].should.have.length_of(0)
+    assert len(client.list_grants(KeyId=key_id)["Grants"]) == 0
 
 
 @mock_kms
@@ -148,9 +147,10 @@ def test_revoke_grant_raises_when_grant_does_not_exist():
     with pytest.raises(client.exceptions.NotFoundException) as ex:
         client.revoke_grant(KeyId=key_id, GrantId=not_existent_grant_id)
 
-    ex.value.response["Error"]["Code"].should.equal("NotFoundException")
-    ex.value.response["Error"]["Message"].should.equal(
-        f"Grant ID {not_existent_grant_id} not found"
+    assert ex.value.response["Error"]["Code"] == "NotFoundException"
+    assert (
+        ex.value.response["Error"]["Message"]
+        == f"Grant ID {not_existent_grant_id} not found"
     )
 
 
@@ -170,7 +170,7 @@ def test_retire_grant_by_token():
 
     client.retire_grant(GrantToken=grant_token)
 
-    client.list_grants(KeyId=key_id)["Grants"].should.have.length_of(2)
+    assert len(client.list_grants(KeyId=key_id)["Grants"]) == 2
 
 
 @mock_kms
@@ -189,7 +189,7 @@ def test_retire_grant_by_grant_id():
 
     client.retire_grant(KeyId=key_id, GrantId=grant_id)
 
-    client.list_grants(KeyId=key_id)["Grants"].should.have.length_of(2)
+    assert len(client.list_grants(KeyId=key_id)["Grants"]) == 2
 
 
 def create_key(client):
diff --git a/tests/test_kms/test_kms_policy_enforcement.py b/tests/test_kms/test_kms_policy_enforcement.py
index da450f8a5..f08e22f41 100644
--- a/tests/test_kms/test_kms_policy_enforcement.py
+++ b/tests/test_kms/test_kms_policy_enforcement.py
@@ -46,7 +46,7 @@ class TestKMSPolicyEnforcement:
         with pytest.raises(ClientError) as exc:
             self.client.describe_key(KeyId=self.key_id)
         err = exc.value.response["Error"]
-        err["Code"].should.equal("AccessDeniedException")
+        assert err["Code"] == "AccessDeniedException"
 
     @pytest.mark.parametrize("actions", [["kms:unknown"], ["kms:describestuff"]])
     def test_policy__allow_based_on_actions(self, actions):
@@ -67,7 +67,7 @@ class TestKMSPolicyEnforcement:
             Policy=json.dumps(policy), PolicyName="default", KeyId=self.key_id
         )
         key = self.client.describe_key(KeyId=self.key_id)["KeyMetadata"]
-        key["Description"].should.equal("t")
+        assert key["Description"] == "t"
 
 
 class TestKMSPolicyValidator:
diff --git a/tests/test_kms/test_server.py b/tests/test_kms/test_server.py
index 33b4d8984..5927564da 100644
--- a/tests/test_kms/test_server.py
+++ b/tests/test_kms/test_server.py
@@ -1,5 +1,4 @@
 import json
-import sure  # noqa # pylint: disable=unused-import
 
 import moto.server as server
 from moto import mock_kms
@@ -15,7 +14,6 @@ def test_list_keys():
     test_client = backend.test_client()
 
     res = test_client.get("/?Action=ListKeys")
+    body = json.loads(res.data.decode("utf-8"))
 
-    json.loads(res.data.decode("utf-8")).should.equal(
-        {"Keys": [], "NextMarker": None, "Truncated": False}
-    )
+    assert body == {"Keys": [], "NextMarker": None, "Truncated": False}
diff --git a/tests/test_kms/test_utils.py b/tests/test_kms/test_utils.py
index e8a0e4391..3aea1d3e6 100644
--- a/tests/test_kms/test_utils.py
+++ b/tests/test_kms/test_utils.py
@@ -1,4 +1,3 @@
-import sure  # noqa # pylint: disable=unused-import
 import pytest
 
 from moto.kms.exceptions import (
@@ -60,40 +59,40 @@ CIPHERTEXT_BLOB_VECTORS = [
 def test_generate_data_key():
     test = generate_data_key(123)
 
-    test.should.be.a(bytes)
-    len(test).should.equal(123)
+    assert isinstance(test, bytes)
+    assert len(test) == 123
 
 
 def test_generate_master_key():
     test = generate_master_key()
 
-    test.should.be.a(bytes)
-    len(test).should.equal(MASTER_KEY_LEN)
+    assert isinstance(test, bytes)
+    assert len(test) == MASTER_KEY_LEN
 
 
 @pytest.mark.parametrize("raw,serialized", ENCRYPTION_CONTEXT_VECTORS)
 def test_serialize_encryption_context(raw, serialized):
     test = _serialize_encryption_context(raw)
-    test.should.equal(serialized)
+    assert test == serialized
 
 
 @pytest.mark.parametrize("raw,_serialized", CIPHERTEXT_BLOB_VECTORS)
 def test_cycle_ciphertext_blob(raw, _serialized):
     test_serialized = _serialize_ciphertext_blob(raw)
     test_deserialized = _deserialize_ciphertext_blob(test_serialized)
-    test_deserialized.should.equal(raw)
+    assert test_deserialized == raw
 
 
 @pytest.mark.parametrize("raw,serialized", CIPHERTEXT_BLOB_VECTORS)
 def test_serialize_ciphertext_blob(raw, serialized):
     test = _serialize_ciphertext_blob(raw)
-    test.should.equal(serialized)
+    assert test == serialized
 
 
 @pytest.mark.parametrize("raw,serialized", CIPHERTEXT_BLOB_VECTORS)
 def test_deserialize_ciphertext_blob(raw, serialized):
     test = _deserialize_ciphertext_blob(serialized)
-    test.should.equal(raw)
+    assert test == raw
 
 
 @pytest.mark.parametrize(
@@ -110,15 +109,15 @@ def test_encrypt_decrypt_cycle(encryption_context):
         plaintext=plaintext,
         encryption_context=encryption_context,
     )
-    ciphertext_blob.should_not.equal(plaintext)
+    assert ciphertext_blob != plaintext
 
     decrypted, decrypting_key_id = decrypt(
         master_keys=master_key_map,
         ciphertext_blob=ciphertext_blob,
         encryption_context=encryption_context,
     )
-    decrypted.should.equal(plaintext)
-    decrypting_key_id.should.equal(master_key.id)
+    assert decrypted == plaintext
+    assert decrypting_key_id == master_key.id
 
 
 def test_encrypt_unknown_key_id():