diff --git a/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp b/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
index e25fec5456e..aae3ca3ca2c 100644
--- a/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
+++ b/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
@@ -28,6 +28,7 @@
 
 #include <utils/launcherinterface.h>
 #include <utils/singleton.h>
+#include <utils/temporarydirectory.h>
 
 #include <QCoreApplication>
 #include <QDir>
@@ -56,7 +57,9 @@ static const QList<projectData> projectList{
 #define WITH_CONFIGURED_PROJECT(_source_dir, _build_dir, ...) \
     { \
         QTemporaryDir _build_dir{"test-meson"}; \
-        const auto _meson = MesonWrapper("name", *MesonWrapper::find()); \
+        const auto tool = MesonWrapper::find(); \
+        QVERIFY(tool.has_value()); \
+        const auto _meson = MesonWrapper("name", *tool); \
         run_meson(_meson.setup(Utils::FilePath::fromString(_source_dir), \
                                Utils::FilePath::fromString(_build_dir.path()))); \
         QVERIFY(isSetup(Utils::FilePath::fromString(_build_dir.path()))); \
@@ -67,7 +70,9 @@ static const QList<projectData> projectList{
     { \
         QTemporaryFile _intro_file; \
         _intro_file.open(); \
-        const auto _meson = MesonWrapper("name", *MesonWrapper::find()); \
+        const auto tool = MesonWrapper::find(); \
+        QVERIFY(tool.has_value()); \
+        const auto _meson = MesonWrapper("name", *tool); \
         run_meson(_meson.introspect(Utils::FilePath::fromString(_source_dir)), &_intro_file); \
         __VA_ARGS__ \
     }
@@ -79,6 +84,8 @@ class AMesonInfoParser : public QObject
 private slots:
     void initTestCase()
     {
+        Utils::TemporaryDirectory::setMasterTemporaryDirectory(QDir::tempPath()
+                                                               + "/mesontest-XXXXXX");
         Utils::LauncherInterface::setPathToLauncher(qApp->applicationDirPath() + '/'
                                                     + QLatin1String(TEST_RELATIVE_LIBEXEC_PATH));
     }
@@ -126,5 +133,5 @@ private slots:
 private:
 };
 
-QTEST_MAIN(AMesonInfoParser)
+QTEST_GUILESS_MAIN(AMesonInfoParser)
 #include "testmesoninfoparser.moc"
diff --git a/src/plugins/mesonprojectmanager/tests/testmesonparser.cpp b/src/plugins/mesonprojectmanager/tests/testmesonparser.cpp
index 6a003cc45dc..6a3b34df318 100644
--- a/src/plugins/mesonprojectmanager/tests/testmesonparser.cpp
+++ b/src/plugins/mesonprojectmanager/tests/testmesonparser.cpp
@@ -296,6 +296,6 @@ private slots:
     void cleanupTestCase() {}
 };
 
-QTEST_MAIN(AMesonOutputParser)
+QTEST_GUILESS_MAIN(AMesonOutputParser)
 
 #include "testmesonparser.moc"
diff --git a/src/plugins/mesonprojectmanager/tests/testmesonwrapper.cpp b/src/plugins/mesonprojectmanager/tests/testmesonwrapper.cpp
index 7db2c49480d..8e0edfbe667 100644
--- a/src/plugins/mesonprojectmanager/tests/testmesonwrapper.cpp
+++ b/src/plugins/mesonprojectmanager/tests/testmesonwrapper.cpp
@@ -27,6 +27,7 @@
 
 #include <utils/launcherinterface.h>
 #include <utils/singleton.h>
+#include <utils/temporarydirectory.h>
 
 #include <QCoreApplication>
 #include <QDir>
@@ -50,6 +51,8 @@ class AMesonWrapper : public QObject
 private slots:
     void initTestCase()
     {
+        Utils::TemporaryDirectory::setMasterTemporaryDirectory(QDir::tempPath()
+                                                               + "/mesontest-XXXXXX");
         Utils::LauncherInterface::setPathToLauncher(qApp->applicationDirPath() + '/'
                                                     + QLatin1String(TEST_RELATIVE_LIBEXEC_PATH));
     }
@@ -120,5 +123,5 @@ private slots:
 private:
 };
 
-QTEST_MAIN(AMesonWrapper)
+QTEST_GUILESS_MAIN(AMesonWrapper)
 #include "testmesonwrapper.moc"
diff --git a/src/plugins/mesonprojectmanager/tests/testninjaparser.cpp b/src/plugins/mesonprojectmanager/tests/testninjaparser.cpp
index 321eb02e3ae..f2281a35caa 100644
--- a/src/plugins/mesonprojectmanager/tests/testninjaparser.cpp
+++ b/src/plugins/mesonprojectmanager/tests/testninjaparser.cpp
@@ -108,5 +108,5 @@ private slots:
     void cleanupTestCase() {}
 };
 
-QTEST_MAIN(ANinjaParser)
+QTEST_GUILESS_MAIN(ANinjaParser)
 #include "testninjaparser.moc"