Fix: DeleteCluster behavior with SkipFinalClusterSnapshot

Original code was trying to raise a ClientError directly.  Change to
appropriate Redshift exception class.

* Fix test assertion for `boto`.
* Add test coverage for `boto3`.

moto/redshift/exceptions.py

@@ -143,3 +143,10 @@ class ClusterAlreadyExistsFaultError(RedshiftClientError):
         super(ClusterAlreadyExistsFaultError, self).__init__(
             "ClusterAlreadyExists", "Cluster already exists"
         )
+
+
+class InvalidParameterCombinationError(RedshiftClientError):
+    def __init__(self, message):
+        super(InvalidParameterCombinationError, self).__init__(
+            "InvalidParameterCombination", message
+        )

moto/redshift/models.py

@@ -4,7 +4,7 @@ import copy
 import datetime
 
 from boto3 import Session
-from botocore.exceptions import ClientError
+
 from moto.compat import OrderedDict
 from moto.core import BaseBackend, BaseModel, CloudFormationModel
 from moto.core.utils import iso_8601_datetime_with_milliseconds
@@ -17,6 +17,7 @@ from .exceptions import (
     ClusterSnapshotAlreadyExistsError,
     ClusterSnapshotNotFoundError,
     ClusterSubnetGroupNotFoundError,
+    InvalidParameterCombinationError,
     InvalidParameterValueError,
     InvalidSubnetError,
     ResourceNotFoundFaultError,
@@ -655,10 +656,8 @@ class RedshiftBackend(BaseBackend):
                 cluster_skip_final_snapshot is False
                 and cluster_snapshot_identifer is None
             ):
-                raise ClientError(
-                    "InvalidParameterValue",
-                    "FinalSnapshotIdentifier is required for Snapshot copy "
-                    "when SkipFinalSnapshot is False",
+                raise InvalidParameterCombinationError(
+                    "FinalClusterSnapshotIdentifier is required unless SkipFinalClusterSnapshot is specified."
                 )
             elif (
                 cluster_skip_final_snapshot is False

tests/test_redshift/test_redshift.py

@@ -424,7 +424,7 @@ def test_delete_cluster():
     )
 
     conn.delete_cluster.when.called_with(cluster_identifier, False).should.throw(
-        AttributeError
+        boto.exception.JSONResponseError
     )
 
     clusters = conn.describe_clusters()["DescribeClustersResponse"][
@@ -1363,3 +1363,74 @@ def test_create_duplicate_cluster_fails():
     client.create_cluster.when.called_with(**kwargs).should.throw(
         ClientError, "ClusterAlreadyExists"
     )
+
+
+@mock_redshift
+def test_delete_cluster_with_final_snapshot():
+    client = boto3.client("redshift", region_name="us-east-1")
+
+    with pytest.raises(ClientError) as ex:
+        client.delete_cluster(ClusterIdentifier="non-existent")
+    ex.value.response["Error"]["Code"].should.equal("ClusterNotFound")
+    ex.value.response["Error"]["Message"].should.match(r"Cluster .+ not found.")
+
+    cluster_identifier = "my_cluster"
+    client.create_cluster(
+        ClusterIdentifier=cluster_identifier,
+        ClusterType="single-node",
+        DBName="test",
+        MasterUsername="user",
+        MasterUserPassword="password",
+        NodeType="ds2.xlarge",
+    )
+
+    with pytest.raises(ClientError) as ex:
+        client.delete_cluster(
+            ClusterIdentifier=cluster_identifier, SkipFinalClusterSnapshot=False
+        )
+    ex.value.response["Error"]["Code"].should.equal("InvalidParameterCombination")
+    ex.value.response["Error"]["Message"].should.contain(
+        "FinalClusterSnapshotIdentifier is required unless SkipFinalClusterSnapshot is specified."
+    )
+
+    snapshot_identifier = "my_snapshot"
+    client.delete_cluster(
+        ClusterIdentifier=cluster_identifier,
+        SkipFinalClusterSnapshot=False,
+        FinalClusterSnapshotIdentifier=snapshot_identifier,
+    )
+
+    resp = client.describe_cluster_snapshots(ClusterIdentifier=cluster_identifier)
+    resp["Snapshots"].should.have.length_of(1)
+    resp["Snapshots"][0]["SnapshotIdentifier"].should.equal(snapshot_identifier)
+    resp["Snapshots"][0]["SnapshotType"].should.equal("manual")
+
+    with pytest.raises(ClientError) as ex:
+        client.describe_clusters(ClusterIdentifier=cluster_identifier)
+    ex.value.response["Error"]["Code"].should.equal("ClusterNotFound")
+    ex.value.response["Error"]["Message"].should.match(r"Cluster .+ not found.")
+
+
+@mock_redshift
+def test_delete_cluster_without_final_snapshot():
+    client = boto3.client("redshift", region_name="us-east-1")
+    cluster_identifier = "my_cluster"
+    client.create_cluster(
+        ClusterIdentifier=cluster_identifier,
+        ClusterType="single-node",
+        DBName="test",
+        MasterUsername="user",
+        MasterUserPassword="password",
+        NodeType="ds2.xlarge",
+    )
+    client.delete_cluster(
+        ClusterIdentifier=cluster_identifier, SkipFinalClusterSnapshot=True
+    )
+
+    resp = client.describe_cluster_snapshots(ClusterIdentifier=cluster_identifier)
+    resp["Snapshots"].should.have.length_of(0)
+
+    with pytest.raises(ClientError) as ex:
+        client.describe_clusters(ClusterIdentifier=cluster_identifier)
+    ex.value.response["Error"]["Code"].should.equal("ClusterNotFound")
+    ex.value.response["Error"]["Message"].should.match(r"Cluster .+ not found.")