first test for hello world

go.mod

@@ -0,0 +1,3 @@
+module hello
+
+go 1.22.5

hello.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func Hello() string {
+	return "Hello world"
+}
+
+func main() {
+	fmt.Println(Hello())
+}

hello_test.go

@@ -0,0 +1,11 @@
+package main
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	got := Hello()
+	exp := "Hello world"
+	if got != exp {
+		t.Errorf("got %q expected %q", got, exp)
+	}
+}