test: add more tests (#1106)

* style: format code

* test: add more tests

* fix: staticcheck errors

core/syncx/resourcemanager_test.go

@@ -47,14 +47,28 @@ func TestResourceManager_GetResourceError(t *testing.T) {
 
 func TestResourceManager_Close(t *testing.T) {
 	manager := NewResourceManager()
-
 	for i := 0; i < 10; i++ {
 		_, err := manager.GetResource("key", func() (io.Closer, error) {
 			return nil, errors.New("fail")
 		})
 		assert.NotNil(t, err)
 	}
-	err := manager.Close()
-	assert.NoError(t, err)
-	assert.Equal(t, 0, len(manager.resources))
+
+	if assert.NoError(t, manager.Close()) {
+		assert.Equal(t, 0, len(manager.resources))
+	}
+}
+
+func TestResourceManager_UseAfterClose(t *testing.T) {
+	manager := NewResourceManager()
+	_, err := manager.GetResource("key", func() (io.Closer, error) {
+		return nil, errors.New("fail")
+	})
+	assert.NotNil(t, err)
+	if assert.NoError(t, manager.Close()) {
+		_, err = manager.GetResource("key", func() (io.Closer, error) {
+			return nil, errors.New("fail")
+		})
+		assert.NotNil(t, err)
+	}
 }