Improve network error messages (#4704)

tests/src/NetworkRequest.cpp

@@ -210,7 +210,9 @@ TEST(NetworkRequest, TimeoutTimingOut)
         .onError([&waiter, url](const NetworkResult &result) {
             qDebug() << QTime::currentTime().toString()
                      << "timeout request finish error";
-            EXPECT_EQ(result.status(), NetworkResult::timedoutStatus);
+            EXPECT_EQ(result.error(),
+                      NetworkResult::NetworkError::TimeoutError);
+            EXPECT_EQ(result.status(), std::nullopt);
 
             waiter.requestDone();
         })
@@ -267,7 +269,9 @@ TEST(NetworkRequest, FinallyCallbackOnTimeout)
         })
         .onError([&](const NetworkResult &result) {
             onErrorCalled = true;
-            EXPECT_EQ(result.status(), NetworkResult::timedoutStatus);
+            EXPECT_EQ(result.error(),
+                      NetworkResult::NetworkError::TimeoutError);
+            EXPECT_EQ(result.status(), std::nullopt);
         })
         .finally([&] {
             finallyCalled = true;

tests/src/NetworkResult.cpp

@@ -0,0 +1,48 @@
+#include "common/NetworkResult.hpp"
+
+#include <gtest/gtest.h>
+
+using namespace chatterino;
+
+using Error = NetworkResult::NetworkError;
+
+namespace {
+
+void checkResult(const NetworkResult &res, Error error,
+                 std::optional<int> status, const QString &formatted)
+{
+    ASSERT_EQ(res.error(), error);
+    ASSERT_EQ(res.status(), status);
+    ASSERT_EQ(res.formatError(), formatted);
+}
+
+}  // namespace
+
+TEST(NetworkResult, NoError)
+{
+    checkResult({Error::NoError, 200, {}}, Error::NoError, 200, "200");
+    checkResult({Error::NoError, 202, {}}, Error::NoError, 202, "202");
+
+    // no status code
+    checkResult({Error::NoError, {}, {}}, Error::NoError, std::nullopt,
+                "NoError");
+}
+
+TEST(NetworkResult, Errors)
+{
+    checkResult({Error::TimeoutError, {}, {}}, Error::TimeoutError,
+                std::nullopt, "TimeoutError");
+    checkResult({Error::RemoteHostClosedError, {}, {}},
+                Error::RemoteHostClosedError, std::nullopt,
+                "RemoteHostClosedError");
+
+    // status code takes precedence
+    checkResult({Error::TimeoutError, 400, {}}, Error::TimeoutError, 400,
+                "400");
+}
+
+TEST(NetworkResult, InvalidError)
+{
+    checkResult({static_cast<Error>(-1), {}, {}}, static_cast<Error>(-1),
+                std::nullopt, "unknown error (-1)");
+}