Implement #4442 , goctl generate unit test files for api handler and logic (#4443)

tools/goctl/api/gogen/handler_test.tpl

@@ -0,0 +1,81 @@
+package {{.PkgName}}
+
+import (
+	"bytes"
+	{{if .HasRequest}}"encoding/json"{{end}}
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	{{.ImportPackages}}
+)
+
+{{if .HasDoc}}{{.Doc}}{{end}}
+func Test{{.HandlerName}}(t *testing.T) {
+	// new service context
+	c := config.Config{}
+	svcCtx := svc.NewServiceContext(c)
+    // init mock service context here
+
+	tests := []struct {
+		name       string
+		reqBody    interface{}
+		wantStatus int
+		wantResp   string
+		setupMocks func()
+	}{
+		{
+			name:    "invalid request body",
+			reqBody: "invalid",
+			wantStatus: http.StatusBadRequest,
+			wantResp:   "unsupported type", // Adjust based on actual error response
+			setupMocks: func() {
+				// No setup needed for this test case
+			},
+		},
+		{
+			name: "handler error",
+			{{if .HasRequest}}reqBody: types.{{.RequestType}}{
+				//TODO: add fields here
+			},
+			{{end}}wantStatus: http.StatusBadRequest,
+			wantResp:  "error", // Adjust based on actual error response
+			setupMocks: func() {
+				// Mock login logic to return an error
+			},
+		},
+		{
+			name: "handler successful",
+			{{if .HasRequest}}reqBody: types.{{.RequestType}}{
+				//TODO: add fields here
+			},
+			{{end}}wantStatus: http.StatusOK,
+			wantResp:   `{"code":0,"msg":"success","data":{}}`, // Adjust based on actual success response
+			setupMocks: func() {
+				// Mock login logic to return success
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.setupMocks()
+			var reqBody []byte
+			{{if .HasRequest}}var err error
+			reqBody, err = json.Marshal(tt.reqBody)
+			require.NoError(t, err){{end}}
+			req, err := http.NewRequest("POST", "/ut", bytes.NewBuffer(reqBody))
+			require.NoError(t, err)
+			req.Header.Set("Content-Type", "application/json")
+
+			rr := httptest.NewRecorder()
+			handler := {{.HandlerName}}(svcCtx)
+			handler.ServeHTTP(rr, req)
+			t.Log(rr.Body.String())
+			assert.Equal(t, tt.wantStatus, rr.Code)
+			assert.Contains(t, rr.Body.String(), tt.wantResp)
+		})
+	}
+}