test(router): assert the exact Allow header after removing a custom method

Author: vishr

router_test.go

@@ -3164,7 +3164,7 @@ func TestDefaultRouter_RemoveCustomMethod(t *testing.T) {
 	rec := httptest.NewRecorder()
 	e.ServeHTTP(rec, httptest.NewRequest("PURGE", "/cache", nil))
 	assert.Equal(t, http.StatusMethodNotAllowed, rec.Code)
-	assert.NotContains(t, rec.Header().Get(HeaderAllow), "PURGE")
+	assert.Equal(t, "GET, OPTIONS", rec.Header().Get(HeaderAllow))
 
 	rec = httptest.NewRecorder()
 	e.ServeHTTP(rec, httptest.NewRequest("PURGE", "/purge-only", nil))