tests: force the English locale for dolphinmainwindowtest

testWindowTitle compares the window title against fixed strings such as
"Home" and "Trash". On a machine configured for another language the
title comes back translated, for example "Dossier Personnel", and the
test fails.

Set the language environment variables to English in main(), before
QApplication is constructed and before any translation is loaded, so the
comparisons are deterministic regardless of the machine's configured
language.

1 files changed, 16 insertions, 2 deletions

diff --git a/src/tests/dolphinmainwindowtest.cpp b/src/tests/dolphinmainwindowtest.cpp
index 1b036436e..ad2543a99 100644
--- a/src/tests/dolphinmainwindowtest.cpp
+++ b/src/tests/dolphinmainwindowtest.cpp
@@ -519,7 +519,7 @@ void DolphinMainWindowTest::testWindowTitle_data()
     QTest::addColumn<QUrl>("activeViewUrl");
     QTest::addColumn<QString>("expectedWindowTitle");
 
-    // TODO: this test should enforce the english locale.
+    // The English locale is forced in main(), so these titles are compared verbatim.
     QTest::newRow("home") << QUrl::fromLocalFile(QDir::homePath()) << QStringLiteral("Home");
     QTest::newRow("home with trailing slash") << QUrl::fromLocalFile(QStringLiteral("%1/").arg(QDir::homePath())) << QStringLiteral("Home");
     QTest::newRow("trash") << QUrl::fromUserInput(QStringLiteral("trash:/")) << QStringLiteral("Trash");
@@ -1534,6 +1534,20 @@ void DolphinMainWindowTest::cleanupTestCase()
     m_mainWindow->actionCollection()->action(KStandardAction::name(KStandardAction::Quit))->trigger();
 }
 
-QTEST_MAIN(DolphinMainWindowTest)
+int main(int argc, char *argv[])
+{
+    // Force the English locale before QApplication and any translation lookup, so that
+    // tests comparing user-visible strings (such as window titles) do not depend on the
+    // language configured on the developer's or CI machine.
+    qputenv("LANG", "C.UTF-8");
+    qputenv("LANGUAGE", "en_US");
+    qputenv("LC_ALL", "C.UTF-8");
+
+    QApplication app(argc, argv);
+    app.setAttribute(Qt::AA_Use96Dpi, true);
+    QTEST_SET_MAIN_SOURCE_PATH
+    DolphinMainWindowTest tc;
+    return QTest::qExec(&tc, argc, argv);
+}
 
 #include "dolphinmainwindowtest.moc"