Fail during conf init if auth or token URL is not valid.

oauth2_test.go

@@ -36,10 +36,7 @@ func newTestConf() *Config {
 
 func TestAuthCodeURL(t *testing.T) {
 	conf := newTestConf()
-	url, err := conf.AuthCodeURL("foo")
-	if err != nil {
-		t.Fatalf("Expected to generate an auth URL, failed with %v.", err)
-	}
+	url := conf.AuthCodeURL("foo")
 	if url != "auth-url?access_type=offline&approval_prompt=force&client_id=CLIENT_ID&redirect_uri=REDIRECT_URL&response_type=code&scope=scope1+scope2&state=foo" {
 		t.Fatalf("Generated auth URL is not the expected. Found %v.", url)
 	}