diff --git a/gwp_test.go b/gwp_test.go
new file mode 100644
index 0000000..84342ff
--- /dev/null
+++ b/gwp_test.go
@@ -0,0 +1,27 @@
+package gwp
+
+import (
+	"sync/atomic"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBasic(t *testing.T) {
+	for i := 0; i < 10; i++ {
+		wp := New(i)
+
+		count := new(int64)
+
+		for j := 0; j < 100; j++ {
+			wp.Add(func() error {
+				atomic.AddInt64(count, 1)
+				return nil
+			})
+		}
+
+		wp.CloseAndWait()
+
+		assert.EqualValues(t, 100, *count)
+	}
+}