Even more tests, crossed 50% coverage

helpers.go

@@ -79,8 +79,7 @@ func (t *TraefikOidc) handleLogout(rw http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	rw.WriteHeader(http.StatusForbidden)
-	rw.Write([]byte("Logged out"))
+	http.Error(rw, "Logged out", http.StatusForbidden)
 }
 
 func (t *TraefikOidc) handleCallback(rw http.ResponseWriter, req *http.Request) (bool, string) {

main.go

@@ -181,8 +181,7 @@ func (t *TraefikOidc) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 
 	if req.URL.Path == t.logoutURLPath {
 		t.handleLogout(rw, req)
-		http.Error(rw, "Logged out", http.StatusForbidden)
-		return
+		return // Remove the http.Error call here
 	}
 
 	if t.redirectURL == "" {
@@ -300,11 +299,14 @@ func (t *TraefikOidc) buildAuthURL(redirectURL, state, nonce string) string {
 		"client_id":     {t.clientID},
 		"response_type": {"code"},
 		"redirect_uri":  {redirectURL},
-		"scope":         {strings.Join(t.scopes, " ")},
 		"state":         {state},
 		"nonce":         {nonce},
 	}
 
+	if len(t.scopes) > 0 {
+		params.Set("scope", strings.Join(t.scopes, " "))
+	}
+
 	return fmt.Sprintf("%s?%s", t.authURL, params.Encode())
 }
 

main_test.go

@@ -28,6 +28,9 @@ type MockHTTPClient struct {
 
 func (m *MockHTTPClient) RoundTrip(req *http.Request) (*http.Response, error) {
 	args := m.Called(req)
+	if args.Get(0) == nil {
+		return nil, args.Error(1)
+	}
 	return args.Get(0).(*http.Response), args.Error(1)
 }
 
@@ -305,7 +308,7 @@ func (suite *TraefikOidcTestSuite) TestHandleLogout() {
 	suite.oidc.handleLogout(rw, req)
 
 	suite.Equal(http.StatusForbidden, rw.Code)
-	suite.Equal("Logged out", rw.Body.String())
+	suite.Equal("Logged out\n", rw.Body.String())
 }
 
 func (suite *TraefikOidcTestSuite) TestExtractClaims() {
@@ -584,3 +587,68 @@ func TestTraefikOidc_ServeHTTP(t *testing.T) {
 		})
 	}
 }
+
+func (suite *TraefikOidcTestSuite) TestBuildAuthURL_CustomScopes() {
+	suite.oidc.scopes = []string{"openid", "email", "custom_scope"}
+	authURL := suite.oidc.buildAuthURL("http://example.com/callback", "test_state", "test_nonce")
+	suite.Contains(authURL, "scope=openid+email+custom_scope")
+}
+
+func (suite *TraefikOidcTestSuite) TestBuildAuthURL_EmptyScopes() {
+	suite.oidc.scopes = []string{}
+	authURL := suite.oidc.buildAuthURL("http://example.com/callback", "test_state", "test_nonce")
+	suite.NotContains(authURL, "scope=")
+}
+
+func (suite *TraefikOidcTestSuite) TestDetermineScheme_ForceHTTPS() {
+	suite.oidc.forceHTTPS = true
+	req := httptest.NewRequest("GET", "http://example.com", nil)
+	scheme := suite.oidc.determineScheme(req)
+	suite.Equal("https", scheme)
+}
+
+func (suite *TraefikOidcTestSuite) TestHandleLogout_CustomLogoutURL() {
+	suite.oidc.logoutURLPath = "/custom-logout"
+	req := httptest.NewRequest("GET", "http://example.com/custom-logout", nil)
+	rw := httptest.NewRecorder()
+
+	session := sessions.NewSession(suite.mockStore, cookieName)
+	session.Values["id_token"] = "test_token"
+
+	suite.mockStore.On("Get", req, cookieName).Return(session, nil)
+	suite.mockStore.On("Save", mock.Anything, mock.Anything, mock.Anything).Return(nil)
+
+	suite.oidc.ServeHTTP(rw, req)
+
+	suite.Equal(http.StatusForbidden, rw.Code)
+	suite.Equal("Logged out\n", rw.Body.String())
+}
+
+func (suite *TraefikOidcTestSuite) TestVerifyToken_RateLimitReached() {
+	suite.oidc.limiter = rate.NewLimiter(rate.Every(time.Hour), 1) // Set a very low limit
+	suite.oidc.limiter.Allow()                                     // Use up the only allowed request
+
+	err := suite.oidc.VerifyToken("some_token")
+	suite.Error(err)
+	suite.Contains(err.Error(), "rate limit exceeded")
+}
+
+func (suite *TraefikOidcTestSuite) TestVerifyToken_InvalidJWTFormat() {
+	invalidToken := "invalid.jwt.format"
+	err := suite.oidc.VerifyToken(invalidToken)
+	suite.Error(err)
+	suite.Contains(err.Error(), "failed to parse JWT")
+}
+
+func (suite *TraefikOidcTestSuite) TestDiscoverProviderMetadata_InvalidURL() {
+	invalidURL := "invalid-url"
+	httpClient := &http.Client{
+		Transport: suite.mockHTTPClient,
+	}
+
+	suite.mockHTTPClient.On("RoundTrip", mock.Anything).Return(nil, fmt.Errorf("invalid URL"))
+
+	_, err := discoverProviderMetadata(invalidURL, *httpClient)
+	suite.Error(err)
+	suite.Contains(err.Error(), "failed to fetch provider metadata")
+}