Add tests, update readme

.devcontainer/devcontainer.json

@@ -45,7 +45,7 @@
 	// },
 
 	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "go version",
+	"postCreateCommand": "go install -v github.com/cweill/gotests/gotests@latest",
 
 	// Uncomment to connect as a non-root user. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "vscode"

README.md

@@ -71,9 +71,8 @@ Some things to try:
 6. **Refactoring - extract:**
    - Open `hello.go` and select string, press <kbd>F1</kbd> and run the **Go: Extract to variable** command.
    - Open `hello.go` and select line with return statement, press <kbd>F1</kbd> and run the **Go: Extract to function** command.
-7. **Generate tests:**
-    - Open `hello.go` and press <kbd>F1</kbd> and run the **Go: Generate Unit Tests For File** command.
-    - Implement a test case: Open file `hello_test.go` and edit the line with the `TODO` comment: `{"hello without name", "Hello, "},` 
+7. **Execute tests:**
+    - Open `hello_test.go` and press <kbd>F1</kbd> and run the **Go: Test file** command.
     - You can toggle between implementation file and test file with press <kbd>F1</kbd> and run the **Go: Toggle Test File**
     - Tests can also run as benchmarks: Open file `hello_test.go`, press <kbd>F1</kbd> and run the **Go: Benchmark File**
 8. **Stub generation:** ( [details](https://github.com/josharian/impl))

hello/hello_test.go

@@ -0,0 +1,21 @@
+package hello
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestHelloWithoutName(t *testing.T) {
+	want := "Hello, "
+	if got := Hello(); want != got {
+		t.Errorf("Hello() = %q, want = %q", got, want)
+	}
+}
+
+func TestHelloWithName(t *testing.T) {
+	alex.Name = "Alex"
+	want := fmt.Sprintf("Hello, %s", alex.Name)
+	if got := Hello(); want != got {
+		t.Errorf("Hello() = %q, want = %q", got, want)
+	}
+}

server_test.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHandle(t *testing.T) {
+	req, err := http.NewRequest(http.MethodGet, "/", nil)
+	if err != nil {
+		t.Fatal("Failed to create 'GET /' request")
+	}
+
+	res := httptest.NewRecorder()
+
+	want := "Hello, "
+
+	handle(res, req)
+	if got := res.Body.String(); want != got {
+		t.Errorf("Handle() = %q, want = %q", got, want)
+	}
+}