AndroidTestRunner: get test exit code instead of parsing results

Write the exit code for qt tests at the end of the test run where
it would be available to androidtestrunner to find out the exact
number of failed tests, this would make the custom parses in the
androidtestrunner redandant.

Fixes: QTBUG-129976
Change-Id: I3c2ea9780505f1d4a2a46ae94534cd1e4f07334c
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
(cherry picked from commit 8d4022187b660de6c81c09ea7a4864048aa94978)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/testlib/qtestcase.cpp

@@ -111,6 +111,10 @@
 #include <emscripten.h>
 #endif
 
+#ifdef Q_OS_ANDROID
+#include <QtCore/QStandardPaths>
+#endif
+
 #include <vector>
 
 QT_BEGIN_NAMESPACE
@@ -1790,6 +1794,14 @@ static void initEnvironment()
     qputenv("QT_QTESTLIB_RUNNING", "1");
 }
 
+#ifdef Q_OS_ANDROID
+static QFile androidExitCodeFile()
+{
+    const QString testHome = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
+    return QFile(testHome + "/qtest_last_exit_code"_L1);
+}
+#endif
+
 /*!
     Executes tests declared in \a testObject. In addition, the private slots
     \c{initTestCase()}, \c{cleanupTestCase()}, \c{init()} and \c{cleanup()}
@@ -1890,6 +1902,10 @@ void QTest::qInit(QObject *testObject, int argc, char **argv)
     if (QBenchmarkGlobalData::current->mode() != QBenchmarkGlobalData::CallgrindParentProcess)
 #endif
         QTestLog::startLogging();
+
+#ifdef Q_OS_ANDROID
+    androidExitCodeFile().remove();
+#endif
 }
 
 /*! \internal
@@ -1984,7 +2000,19 @@ int QTest::qRun()
 #endif
     // make sure our exit code is never going above 127
     // since that could wrap and indicate 0 test fails
-    return qMin(QTestLog::failCount(), 127);
+    const int exitCode = qMin(QTestLog::failCount(), 127);
+
+#ifdef Q_OS_ANDROID
+    QFile exitCodeFile = androidExitCodeFile();
+    if (exitCodeFile.open(QIODevice::WriteOnly)) {
+        exitCodeFile.write(qPrintable(QString::number(exitCode)));
+    } else {
+        qWarning("Failed to open %s for writing test exit code: %s",
+                 qPrintable(exitCodeFile.fileName()), qPrintable(exitCodeFile.errorString()));
+    }
+#endif
+
+    return exitCode;
 }
 
 /*! \internal

src/tools/androidtestrunner/main.cpp

@@ -550,7 +550,7 @@ static QString runCommandAsUserArgs(const QString &cmd)
     return "run-as %1 --user %2 %3"_L1.arg(g_options.package, g_testInfo.userId, cmd);
 }
 
-static bool pullFiles()
+static bool pullResults()
 {
     bool ret = true;
     for (auto it = g_options.outFiles.constBegin(); it != g_options.outFiles.end(); ++it) {
@@ -719,6 +719,19 @@ static QString getCurrentTimeString()
     return QString::fromUtf8(output.simplified());
 }
 
+static int testExitCode()
+{
+    QByteArray exitCodeOutput;
+    const QString exitCodeCmd = "cat files/qtest_last_exit_code 2> /dev/null"_L1;
+    if (!execAdbCommand({ "shell"_L1, runCommandAsUserArgs(exitCodeCmd) }, &exitCodeOutput))
+        return 1;
+
+    bool ok;
+    int exitCode = exitCodeOutput.toInt(&ok);
+
+    return ok ? exitCode : 1;
+}
+
 static bool uninstallTestPackage()
 {
     return execAdbCommand({ "uninstall"_L1, g_options.package }, nullptr);
@@ -831,24 +844,24 @@ int main(int argc, char *argv[])
     const QString formattedTime = getCurrentTimeString();
 
     // start the tests
-    bool success = execAdbCommand(g_options.amStarttestArgs, nullptr);
+    if (!execAdbCommand(g_options.amStarttestArgs, nullptr))
+        return 1;
 
     waitForStartedAndFinished();
 
-    if (success) {
-        success &= pullFiles();
-        if (g_options.showLogcatOutput)
-            printLogcat(formattedTime);
-    }
+    int exitCode = testExitCode();
 
     // If we have a failure, attempt to print both logcat and the crash buffer which
     // includes the crash stacktrace that is not included in the default logcat.
-    if (!success) {
+    if (exitCode != 0 || g_options.showLogcatOutput)
         printLogcat(formattedTime);
+    if (exitCode != 0)
         printLogcatCrashBuffer(formattedTime);
-    }
 
-    success &= uninstallTestPackage();
+    exitCode = pullResults() ? exitCode : 1;
+
+    if (!uninstallTestPackage())
+        return 1;
 
     testRunnerLock.release();
 
@@ -857,5 +870,5 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    return success ? 0 : 1;
+    return exitCode;
 }