Support create_table with PAY_PER_REQUEST billing mode of DynamoDB

moto/dynamodb2/responses.py

@@ -156,7 +156,15 @@ class DynamoHandler(BaseResponse):
         body = self.body
         # get the table name
         table_name = body['TableName']
-        # get the throughput
+        # check billing mode and get the throughput
+        if "BillingMode" in body.keys() and body["BillingMode"] == "PAY_PER_REQUEST":
+            if "ProvisionedThroughput" in body.keys():
+                er = 'com.amazonaws.dynamodb.v20111205#ValidationException'
+                return self.error(er,
+                                  'ProvisionedThroughput cannot be specified \
+                                   when BillingMode is PAY_PER_REQUEST')
+            throughput = None
+        else:         # Provisioned (default billing mode)
             throughput = body["ProvisionedThroughput"]
         # getting the schema
         key_schema = body['KeySchema']

tests/test_dynamodb2/test_dynamodb.py

@@ -949,6 +949,33 @@ def test_bad_scan_filter():
         raise RuntimeError('Should of raised ResourceInUseException')
 
 
+@mock_dynamodb2
+def test_create_table_pay_per_request():
+    client = boto3.client('dynamodb', region_name='us-east-1')
+    client.create_table(
+        TableName='test1',
+        AttributeDefinitions=[{'AttributeName': 'client', 'AttributeType': 'S'}, {'AttributeName': 'app', 'AttributeType': 'S'}],
+        KeySchema=[{'AttributeName': 'client', 'KeyType': 'HASH'}, {'AttributeName': 'app', 'KeyType': 'RANGE'}],
+        BillingMode="PAY_PER_REQUEST"
+    )
+
+
+@mock_dynamodb2
+def test_create_table_error_pay_per_request_with_provisioned_param():
+    client = boto3.client('dynamodb', region_name='us-east-1')
+
+    try:
+        client.create_table(
+            TableName='test1',
+            AttributeDefinitions=[{'AttributeName': 'client', 'AttributeType': 'S'}, {'AttributeName': 'app', 'AttributeType': 'S'}],
+            KeySchema=[{'AttributeName': 'client', 'KeyType': 'HASH'}, {'AttributeName': 'app', 'KeyType': 'RANGE'}],
+            ProvisionedThroughput={'ReadCapacityUnits': 123, 'WriteCapacityUnits': 123},
+            BillingMode="PAY_PER_REQUEST"
+        )
+    except ClientError as err:
+        err.response['Error']['Code'].should.equal('ValidationException')
+
+
 @mock_dynamodb2
 def test_duplicate_create():
     client = boto3.client('dynamodb', region_name='us-east-1')