Testing in Go

go/hello_test.go

@@ -0,0 +1,34 @@
+package main
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	assertCorrectMessage := func(t testing.TB, got string, want string) {
+		t.Helper()
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	}
+
+	t.Run("saying hello to people", func (t *testing.T) {
+		got := Hello("Oliver", "")
+		want := "Hello, Oliver"
+
+		assertCorrectMessage(t, got, want)
+	})
+
+	t.Run("say 'Hello, World' when an empty string is supplied", func (t *testing.T) {
+		got := Hello("", "")
+		want := "Hello, World"
+
+		assertCorrectMessage(t, got, want)
+	})
+
+	t.Run("in Welsh", func (t *testing.T) {
+		got := Hello("Oliver", "Welsh")
+		want := "Helo, Oliver"
+
+		assertCorrectMessage(t, got, want)
+	})
+}