Schema Compare tests addition (#5136)

* initial tests for schema compare

* Adding schema compare integration test

* Adding code to fix some build issues

* DB compare test

* Adding some CR comments

* db creation and deletion as per CR comments

extensions/schema-compare/src/test/testSchemaCompareService.ts

@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as azdata from 'azdata';
+
+export class SchemaCompareTestService implements azdata.SchemaCompareServicesProvider {
+
+	testOperationId: string = 'Test Operation Id';
+
+	schemaComparePublishChanges(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> {
+		throw new Error('Method not implemented.');
+	}
+
+	schemaCompareGetDefaultOptions(): Thenable<azdata.SchemaCompareOptionsResult> {
+		throw new Error('Method not implemented.');
+	}
+
+	schemaCompareIncludeExcludeNode(operationId: string, diffEntry: azdata.DiffEntry, IncludeRequest: boolean, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> {
+		throw new Error('Method not implemented.');
+	}
+
+	schemaCompare(sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.SchemaCompareResult> {
+		let result: azdata.SchemaCompareResult = {
+			operationId: this.testOperationId,
+			areEqual: true,
+			differences: [],
+			success: true,
+			errorMessage: ''
+		};
+
+		return Promise.resolve(result);
+	}
+
+	schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.DacFxResult> {
+		return undefined;
+	}
+
+	handle?: number;
+	readonly providerId: string = 'MSSQL';
+
+	registerOnUpdated(handler: () => any): void {
+	}
+}