You can partially mock the interface. For example I want to simulate AWS S3:
// real S3 client
type realAWSClient struct {
s3iface.S3API
}
func processMyBuckets(s3 *s3iface.S3API) {
list := s3.ListBuckets(...)
// work with list
}
func main() {
cli := &realAWSClient{S3API: s3.New(...)}
processMyBuckets(cli)
}
// mock struct in _test.go code
type mockAWSClient struct {
s3iface.S3API
}
func (mock *mockAWSClient) ListBuckets(*s3.ListBucketsOutput, error) {
out := createMockOutput()
return out, nil
}
func TestMyBuckets() {
cli := &mockAWSClient{}
processMyBuckets(cli)
}
S3API interface has many methods, but in this case I mock only ListBuckets
method.
If my code will call other methods then I'll get nil pointer error and I'll
mock new methods as needed.
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