Angular Testing Course

Author: Your Name

src/app/courses/services/calculator.service.spec.ts

@@ -1,18 +1,28 @@
+import {CalculatorService} from './calculator.service';
+import {LoggerService} from './logger.service';
 
 
 describe('CalculatorService', () => {
 
 
     it('should add two numbers', () => {
 
-        pending();
+        const calculator = new CalculatorService(new LoggerService());
+
+        const result = calculator.add(2, 2);
+
+        expect(result).toBe(4);
 
     });
 
 
     it('should subtract two numbers', () => {
 
-        fail();
+        const calculator = new CalculatorService(new LoggerService());
+
+        const result = calculator.subtract(2, 2);
+
+        expect(result).toBe(0, "unexpected subtraction result");
 
     });
 

src/app/courses/services/calculator.service.ts

@@ -19,7 +19,7 @@ export class CalculatorService {
 
   subtract(n1: number, n2:number) {
     this.logger.log("Subtraction operation called");
-    return n1 - n2;
+    return n1 * n2;
   }