英文:
Passing mock as argument in Golang test
问题
这是我正在测试的代码：
func listObjects(cli *client.Client, options clientOptions) ([]BlobObjects, error) {
objects, err := cli.ListBlobObjects(...)
}
在我的测试设置中，我这样做：
type MockClient struct {
MockListBlobObjects func() ([]BlobObjects, error)
}
func (m *MockClient) ListBlobObjects(...) ([]BlobObjects, error) {
// 返回一些模拟的响应
}
这是我的测试用例：
func TestBlobObjects(t *testing.T) {
tests := map[string]struct {
client *MockClient
...
}{
"Test case 1": {
client: &MockClient{
MockListBlobObjects: ...,
},
...
},
...
}
for testName, test := range tests {
blobs, err := listObjects(test.client, clientOptions{})
// 在这里进行断言
}
}
问题是test.client。编译器告诉我：
无法将类型为*MockClient的test.client作为参数传递给listObjects中类型为*client.Client的变量
我希望我有一个模拟客户端，如果我调用被测试的函数，那么传递的模拟客户端将调用模拟的listObjects函数。在Python中，我会这样做。
在Golang中我该怎么做？
英文:
This is the code I am testing
func listObjects(cli *client.Client, options clientOptions) ([]BlobObjects, error) {
objects, err := cli.ListBlobObjects(...)
}
In my test setup I do this
type MockClient struct {
MockListBlobObjects func() ([]BlobObjects, error)
}
func (m *MockClient) ListBlobObjects(....) ([]BlobObjects, error) {
// return some mock response
}
And this is my test case
func TestBlobObjects(t *testing.T) {
tests := map[string]struct {
client *MockClient
...
}{
"Test case 1": {
client: &MockClient{
MockListBlobObjects: ....,
},
....
},
....
for testName, test := range tests {
blobs, err := (test.client, clientOptions{})
// make assertions here
}
The problem is test.client. Compiler is telling me
cannot use test.client (variable of type *MockClient) as *client.Client value in argument to listObjects
My hope was I have a mock client and if I call the function under test, then the mock client passed will call the mocked listObjects. This is how I would do in Python.
What should I do in Golang?
答案1
得分: 2
你需要创建一个公共接口，这个接口将由两种类型实现。
type Client interface {
ListBlobObjects() ([]BlobObjects, error)
}
type RealClient struct {
}
func (c *RealClient) ListBlobObjects(....) ([]BlobObjects, error) {
// 返回一些响应
}
type MockClient struct {
// 注意：不要在函数体中放置方法签名
}
func (m *MockClient) ListBlobObjects(....) ([]BlobObjects, error) {
// 返回一些模拟响应
}
然后
var client client.Client
client = &RealClient{}
// 或者
client = &MockClient{}
英文:
You need to create a common interface, which will be implemented by both types
type Client interface {
ListBlobObjects func() ([]BlobObjects, error)
}
type RealClient struct {
}
func (c *RealClient) ListBlobObjects(....) ([]BlobObjects, error) {
// return some response
}
type MockClient struct {
// note: don't put method signature in function body
}
func (m *MockClient) ListBlobObjects(....) ([]BlobObjects, error) {
// return some mock response
}
and then
var client client.Client
client = &RealClient{}
// or
client = &MockClient{}
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