Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/a665de889f04b60a57be19d4fbe8147fa8d693ec/third-party/ArduinoJson/extras/tests/JsonDocument/isNull.cpp You should set ROOT_URL correctly, otherwise the web may not work correctly.

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// ArduinoJson - https://arduinojson.org
// Copyright Benoit Blanchon 2014-2021
// MIT License
#include <ArduinoJson.h>
#include <catch.hpp>
TEST_CASE("JsonDocument::isNull()") {
DynamicJsonDocument doc(4096);
SECTION("returns true if uninitialized") {
REQUIRE(doc.isNull() == true);
}
SECTION("returns false after to<JsonObject>()") {
doc.to<JsonObject>();
REQUIRE(doc.isNull() == false);
}
SECTION("returns false after to<JsonArray>()") {
doc.to<JsonArray>();
REQUIRE(doc.isNull() == false);
}
SECTION("returns true after to<JsonVariant>()") {
REQUIRE(doc.isNull() == true);
}
SECTION("returns false after set()") {
doc.to<JsonVariant>().set(42);
REQUIRE(doc.isNull() == false);
}
SECTION("returns true after clear()") {
doc.to<JsonObject>();
doc.clear();
REQUIRE(doc.isNull() == true);
}
}