test trackExecutionTimeDecorator

apps/server/src/modules/board/metrics/track-execution-time.decorator.spec.ts

@@ -0,0 +1,36 @@
+import { TrackExecutionTime } from './track-execution-time.decorator';
+
+class MockClassWithTrackingFunction {
+	trackExecutionTime(methodName: string, executionTime: number) {
+		console.log(`Executing method ${methodName} took ${executionTime}ms`);
+	}
+}
+class MockClassWithoutTrackingFunction {
+	hello() {
+		console.log('Hello');
+	}
+}
+
+describe('TrackExecutionTimeDecorator', () => {
+	describe('track', () => {
+		describe('when a tracking function is defined in the target object', () => {
+			it('should not throw an exception', () => {
+				const decorator = TrackExecutionTime();
+
+				const target = new MockClassWithTrackingFunction();
+				expect(() => decorator(target, 'nameOfFunctionBeingTracked', {})).not.toThrow();
+			});
+		});
+
+		describe('when no tracking function is defined in the target object', () => {
+			it('should throw an exception', () => {
+				const decorator = TrackExecutionTime();
+
+				const target = new MockClassWithoutTrackingFunction();
+				expect(() => decorator(target, 'nameOfFunctionBeingTracked', {})).toThrowError(
+					`The class MockClassWithoutTrackingFunction does not implement the required trackExecutionTime method.`
+				);
+			});
+		});
+	});
+});