c.Param called in handler test returns empty string

[DGuhr]

I have the following code:

main.go

func main() {
	// Echo instance
	e := echo.New()

	e.Use(middleware.Logger())
	e.Use(middleware.Recover())

	// Routes
	e.GET("/", handler.HelloHandler)
	//userAccess
	e.GET("/tenant/:tenant/user", handler.GetUsers)

	// Start server
	e.Logger.Fatal(e.Start(":3000"))
}

userHandler.go:

...
func GetUsers(c echo.Context) error {
	ctx := context.Background()
	
	callingName := c.QueryParam("callingName") //this works
        ...
	tenantId := c.Param("tenant") //this fails
        ...

Now I try to write a test for this handler like this:

func TestGetUsers(t *testing.T) {
	ctx := context.Background()
	...
	e := echo.New()

	req := httptest.NewRequest(http.MethodGet, "/tenant/customer1/user?callingName=owner1", strings.NewReader(""))
	rec := httptest.NewRecorder()
	echoCtx := e.NewContext(req, rec)

	if assert.NoError(t, GetUsers(echoCtx)) {
		assert.Equal(t, http.StatusOK, rec.Code)
		assert.Contains(t, rec.Body.String(), "Connection to spiceDB successfully established")
	}
}

Can anyone tell me what I am doing wrong here, so that c.Param("tenant") always returns an empty string instead of the expected "customer1"? Very new to using echo, so maybe I understand routing wrong :)

printing out the routes in TestGetUsers into a routes.json as per the doc shows an empty array, also adding the same routes to my test as defined in my main class does not help, routes.json now has the routes, but the Param is still empty. so I am a bit out of ideas here. Any help is highly appreciated :)

[DGuhr]

ok, thanks to this StackOverflow answer it seems I figured it out:

after initializing the context inside the test, you have to define the path, the pathparam and the actual value, too, so the test code for me looks now like:

  echoCtx := e.NewContext(req, rec)
  echoCtx.SetPath("/tenant/:tenant/user")
  echoCtx.SetParamNames("tenant")
  echoCtx.SetParamValues("customer1")

Would be nice to know if this is really the idiomatic way.

[aldas]

This is because context Params are filled during routing. In tests, when you execute handler/middleware directly you circumvent the routing part and therefore need to fill params +some other fields manually. Tests that use e.ServeHTTP(rec, req) also do routing, so params does not need to be filled manually.