feat: update go workflow

.github/workflows/ci-cd.yaml

@@ -1,11 +1,19 @@
 name: Test CI/CD Pipeline
-on: push
+on: 
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
 jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: '1.25.4'
       - name: Run tests
-        run: echo "Running tests..."
+        run: go test -v ./...
 
 

mathops.go

@@ -14,3 +14,7 @@ func Multiply(a, b int) int {
 func IsEven(n int) bool {
 	return n%2 == 0
 }
+
+func displayName(name string) string {
+	return "Hello, " + name + "!"
+}

mathops_test.go

@@ -66,3 +66,23 @@ func TestIsEven(t *testing.T) {
 		})
 	}
 }
+
+func TestDisplayName(t *testing.T) {
+	tests := []struct {
+		name string
+		input string
+		want string
+	}{
+		{name: "regular name", input: "Alice", want: "Hello, Alices!"},
+		{name: "empty name", input: "", want: "Hello, !"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := displayName(tt.input)
+			if got != tt.want {
+				t.Fatalf("displayName(%q) = %q, want %q", tt.input, got, tt.want)
+			}
+		})
+	}
+}