Create calculator.service.spec.ts

Author: amrohit

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

@@ -0,0 +1,23 @@
+import { CalculatorService } from "./calculator.service";
+import { LoggerService } from "./logger.service";
+
+// Test suit
+describe("CalculatorService", () => {
+  // Specification
+  it("should add two number", () => {
+    const calculator = new CalculatorService(new LoggerService());
+
+    const result = calculator.add(2, 2);
+
+    expect(result).toBe(4);
+  });
+
+  // Specification
+  it("should subtract two number", () => {
+    const calculator = new CalculatorService(new LoggerService());
+
+    const result = calculator.subtract(2, 2);
+
+    expect(result).toBe(0);
+  });
+});