How to unit test extraction from cookie in Gin Gonic - unit-testing

Question

I'm using gin gonic. I've a function that extracts a token from a cookie, which actually works. I'm using this function in a route handler and want to test the handler function, but I don't know how.
Function:
// Extracts token from a cookie
func tokenFromCookie(c *gin.Context, name string) (string, error) {
token, err := c.Cookie(name)
if err != nil {
return "", err
}
return token, nil
}
Route:
func RefreshTokenHandler(accessTokenKey string, refreshTokenKey string) gin.HandlerFunc {
fn := func(c *gin.Context) {
token, err := tokenFromCookie(c, "refresh_token")
if err != nil {
_ = c.Error(err).SetMeta(noCookie)
return
}
c.JSON(http.StatusOK, gin.H{
"token": token,
})
})
Route definition:
func CreateRoutes(r *gin.Engine) *gin.Engine {
r.Use(errorHandler)
// Auth
auth := r.Group("/auth")
{
auth.GET("/refresh-token", RefreshTokenHandler(accessTokenSignatureKey, refreshTokenSignatureKey))
}
return r
}
Unit test:
func TestRefreshTokenHandler(t *testing.T) {
req, _ := http.NewRequest("GET", "/auth/refresh-token", nil)
req.AddCookie(&http.Cookie{
Name: "refresh_token",
Value: "token",
MaxAge: 604800,
Expires: time.Now().Add(time.Hour * 24 * 7),
Path: "/",
Domain: "127.0.0.1",
HttpOnly: true,
SameSite: http.SameSiteNoneMode,
Secure: secure
}
)
w := httptest.NewRecorder()
router.ServeHTTP(w, req)
got := w.Code
if gotCode != 200 {
t.Errorf("GET /auth/refresh-token; got %d, want 200", got)
}
}
The tokenFromCookie() function throws an error though:
http: named cookie not present
This is a similar unit test that I found in the gin gonic repo:
func TestContextGetCookie(t *testing.T) {
c, _ := CreateTestContext(httptest.NewRecorder())
c.Request, _ = http.NewRequest("GET", "/get", nil)
c.Request.Header.Set("Cookie", "user=gin")
cookie, _ := c.Cookie("user")
assert.Equal(t, "gin", cookie)
_, err := c.Cookie("nokey")
assert.Error(t, err)
}
Yet I don't understand why my code doesn't work and how to re-write it.

Answer 1

To view the list cookies you can try this:
fmt.Println(c.Request.Cookies())
I don't understand the point of creating new function tokenFromCookie.
func RefreshTokenHandler(accessTokenKey string, refreshTokenKey string) gin.HandlerFunc {
fn := func(c *gin.Context) {
//token, err := tokenFromCookie(c, "refresh_token")
token, err := c.Cookie("refresh_token")
if err != nil {
_ = c.Error(err).SetMeta(noCookie)
return
}
c.JSON(http.StatusOK, gin.H{
"token": token,
})
})