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/schemaCompareResult.ts

@@ -160,12 +160,18 @@ export class SchemaCompareResult {
 
 			await view.initializeModel(this.flexModel);
 		});
+		this.editor.openEditor();
 	}
 
 	public start(): void {
 		this.editor.openEditor();
 	}
 
+	// only for test
+	public getComparisionResult(): azdata.SchemaCompareResult {
+		return this.comparisonResult;
+	}
+
 	private async execute(): Promise<void> {
 		if (this.schemaCompareOptionDialog && this.schemaCompareOptionDialog.deploymentOptions) {
 			// take updates if any