rgw/admin: add ability to mock HTTP Client

We can now use a mocked client to be consumed by unit tests as well as
various users of the API.

Signed-off-by: Sébastien Han <seb@redhat.com>

rgw/admin/mock.go

@@ -0,0 +1,18 @@
+package admin
+
+import (
+	"net/http"
+)
+
+// MockClient is the mock of the HTTP Client
+// It can be used to mock HTTP request/response from the rgw admin ops API
+type MockClient struct {
+	// MockDo is a type that mock the Do method from the HTTP package
+	MockDo MockDoType
+}
+
+// MockDoType is a custom type that allows setting the function that our Mock Do func will run instead
+type MockDoType func(req *http.Request) (*http.Response, error)
+
+// Do is the mock client's `Do` func
+func (m *MockClient) Do(req *http.Request) (*http.Response, error) { return m.MockDo(req) }

rgw/admin/user_test.go

@@ -1,10 +1,13 @@
 package admin
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io/ioutil"
+	"net/http"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -135,3 +138,24 @@ func (suite *RadosGWTestSuite) TestUser() {
 		assert.NoError(suite.T(), err)
 	})
 }
+
+func TestGetUserMockAPI(t *testing.T) {
+	r := ioutil.NopCloser(bytes.NewReader(fakeUserResponse))
+	mockClient := &MockClient{
+		MockDo: func(req *http.Request) (*http.Response, error) {
+			if req.URL.RawQuery == "format=json&uid=dashboard-admin" && req.Method == http.MethodGet && req.URL.Path == "127.0.0.1/admin/user" {
+				return &http.Response{
+					StatusCode: 200,
+					Body:       r,
+				}, nil
+			}
+			return nil, fmt.Errorf("unexpected request: %q. method %q. path %q", req.URL.RawQuery, req.Method, req.URL.Path)
+		},
+	}
+
+	api, err := New("127.0.0.1", "accessKey", "secretKey", mockClient)
+	assert.NoError(t, err)
+	u, err := api.GetUser(context.TODO(), User{ID: "dashboard-admin"})
+	assert.NoError(t, err)
+	assert.Equal(t, "dashboard-admin", u.DisplayName, u)
+}