Add unit test

Author: devlights

runner/loop_test.go

@@ -0,0 +1,30 @@
+package runner_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/devlights/try-golang/mapping"
+	"github.com/devlights/try-golang/runner"
+)
+
+func TestLoop(t *testing.T) {
+	r := new(runner.SilentRegister)
+
+	m := mapping.NewSampleMapping()
+	m.MakeMapping(r)
+
+	buf := new(bytes.Buffer)
+	buf.WriteString("silent\n")
+
+	a := runner.NewLoopArgs(buf, true, m)
+	e := runner.NewLoop(a)
+
+	if err := e.Run(); err != nil {
+		t.Errorf("should not raise error (%s)", err)
+	}
+
+	if !r.Target.Called {
+		t.Errorf("never called the target example")
+	}
+}