Backend: Add unit tests for internal/mutex

internal/mutex/busy_test.go

@@ -21,3 +21,21 @@ func TestBusy_Busy(t *testing.T) {
 	assert.False(t, b.Canceled())
 	assert.False(t, b.Busy())
 }
+
+func TestBusy_Start(t *testing.T) {
+	t.Run("cancelled true", func(t *testing.T) {
+		b := Busy{canceled: true}
+
+		assert.Error(t, b.Start(), "still running")
+	})
+	t.Run("busy true", func(t *testing.T) {
+		b := Busy{busy: true}
+
+		assert.Error(t, b.Start(), "already running")
+	})
+	t.Run("success", func(t *testing.T) {
+		b := Busy{}
+
+		assert.Nil(t, b.Start())
+	})
+}

internal/mutex/mutex_test.go

@@ -0,0 +1,11 @@
+package mutex
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWorkersBusy(t *testing.T) {
+	assert.False(t, WorkersBusy())
+}