9 files changed, 97 insertions, 4 deletions
diff --git a/cmake/QtTestHelpers.cmake b/cmake/QtTestHelpers.cmake
index 639c515dc7..cad4d6ecf9 100644
--- a/cmake/QtTestHelpers.cmake
+++ b/cmake/QtTestHelpers.cmake
@@ -221,8 +221,6 @@ function(qt_internal_add_test name)
             INCLUDE_DIRECTORIES
                 ${private_includes}
             DEFINES
-                QT_TESTCASE_BUILDDIR="${CMAKE_CURRENT_BINARY_DIR}"
-                QT_TESTCASE_SOURCEDIR="${CMAKE_CURRENT_SOURCE_DIR}"
                 ${arg_DEFINES}
             PUBLIC_LIBRARIES ${QT_CMAKE_EXPORT_NAMESPACE}::Core ${QT_CMAKE_EXPORT_NAMESPACE}::Test ${arg_PUBLIC_LIBRARIES}
             LIBRARIES ${arg_LIBRARIES}
diff --git a/src/testlib/CMakeLists.txt b/src/testlib/CMakeLists.txt
index a2307045e7..da53bb8b68 100644
--- a/src/testlib/CMakeLists.txt
+++ b/src/testlib/CMakeLists.txt
@@ -110,6 +110,16 @@ qt_internal_extend_target(Test CONDITION MACOS
         ${FWIOKit}
 )
 
+set(qt_tc_build_dir "$<TARGET_PROPERTY:QT_TESTCASE_BUILDDIR>")
+set(qt_bool_tc_build_dir "$<BOOL:${qt_tc_build_dir}>")
+set(qt_tc_build_dir_def
+    "$<IF:${qt_bool_tc_build_dir},${qt_tc_build_dir},$<TARGET_PROPERTY:BINARY_DIR>>"
+)
+set_property(TARGET Test PROPERTY INTERFACE_COMPILE_DEFINITIONS
+    QT_TESTCASE_BUILDDIR="${qt_tc_build_dir_def}"
+    QT_TESTCASE_SOURCEDIR="$<TARGET_PROPERTY:SOURCE_DIR>"
+)
+
 # special case begin
 # Do not bother with disabled stuff:
 # qt_internal_extend_target(Test CONDITION (MACOS) AND (OFF AND NOT lessThan(QMAKE_XCODE_VERSION, "6.0")) ...
diff --git a/src/testlib/qtestcase.qdoc b/src/testlib/qtestcase.qdoc
index 08f111b43e..2a480fb349 100644
--- a/src/testlib/qtestcase.qdoc
+++ b/src/testlib/qtestcase.qdoc
@@ -522,6 +522,10 @@
    absolute paths to the source files are passed to the compiler. Otherwise, the
    absolute path of the source directory cannot be determined.
 
+   \note The \c{QT_TESTCASE_BUILDDIR} macro is also implicitly defined if CMake is used
+   and the QtTest module is linked to the target. You can change the default
+   \c{QT_TESTCASE_BUILDDIR} by setting the QT_TESTCASE_BUILDDIR property on the target.
+
    \note For tests that use the \l QTEST_APPLESS_MAIN() macro to generate a
    \c{main()} function, \c{QFINDTESTDATA} will not attempt to find test data
    relative to QCoreApplication::applicationDirPath().  In practice, this means that
diff --git a/tests/auto/cmake/CMakeLists.txt b/tests/auto/cmake/CMakeLists.txt
index 4fb6c24d8d..a94f1a51fe 100644
--- a/tests/auto/cmake/CMakeLists.txt
+++ b/tests/auto/cmake/CMakeLists.txt
@@ -112,6 +112,10 @@ if (CMAKE_GENERATOR STREQUAL Ninja AND UNIX AND NOT WIN32)
         BINARY "tests/test_QFINDTESTDATA"
         SIMULATE_IN_SOURCE
     )
+    _qt_internal_test_expect_pass(test_QT_TESTCASE_BUILDDIR
+        BINARY "test_qt_testcase_builddir"
+        SIMULATE_IN_SOURCE
+    )
 endif()
 
 if (NOT NO_DBUS)
diff --git a/tests/auto/cmake/test_QFINDTESTDATA/tests/CMakeLists.txt b/tests/auto/cmake/test_QFINDTESTDATA/tests/CMakeLists.txt
index 6515aa8020..df91a7d84b 100644
--- a/tests/auto/cmake/test_QFINDTESTDATA/tests/CMakeLists.txt
+++ b/tests/auto/cmake/test_QFINDTESTDATA/tests/CMakeLists.txt
@@ -2,5 +2,3 @@
 add_executable(test_QFINDTESTDATA WIN32 main.cpp)
 
 target_link_libraries(test_QFINDTESTDATA Qt::Test)
-target_compile_definitions(test_QFINDTESTDATA PRIVATE QT_TESTCASE_BUILDDIR="${CMAKE_CURRENT_BINARY_DIR}")
-target_compile_definitions(test_QFINDTESTDATA PRIVATE QT_TESTCASE_SOURCEDIR="${CMAKE_CURRENT_SOURCE_DIR}")
diff --git a/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/CMakeLists.txt b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/CMakeLists.txt
new file mode 100644
index 0000000000..f6fe597def
--- /dev/null
+++ b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/CMakeLists.txt
@@ -0,0 +1,20 @@
+# The test is simply testing that manual specification of QT_TESTCASE_BUILDDIR works,
+# despite the weird paths.
+cmake_minimum_required(VERSION 3.14)
+
+project(test_qt_testcase_builddir)
+
+find_package(Qt6Test REQUIRED)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+add_executable(test_qt_testcase_builddir WIN32 main.cpp)
+
+target_link_libraries(test_qt_testcase_builddir Qt::Test)
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/testdata.txt"
+    "${CMAKE_CURRENT_BINARY_DIR}/level1/level2/testdata_build.txt"
+    COPYONLY
+)
+set_target_properties(test_qt_testcase_builddir PROPERTIES
+    QT_TESTCASE_BUILDDIR "${CMAKE_CURRENT_BINARY_DIR}/level1/level2"
+)
diff --git a/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/data/testdata.txt b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/data/testdata.txt
new file mode 100644
index 0000000000..e846386066
--- /dev/null
+++ b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/data/testdata.txt
@@ -0,0 +1 @@
+This is the test data found in QT_TESTCASE_SOURCEDIR.
diff --git a/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/main.cpp b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/main.cpp
new file mode 100644
index 0000000000..8965e0dac3
--- /dev/null
+++ b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/main.cpp
@@ -0,0 +1,57 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QCoreApplication>
+#include <QtTest/QTest>
+#include <QDebug>
+
+class TestClass : public QObject
+{
+    Q_OBJECT
+public:
+    TestClass(QObject *parent = nullptr) { }
+
+private slots:
+    void doTest();
+};
+
+void TestClass::doTest()
+{
+    QFile fsrc(QFINDTESTDATA("data/testdata.txt"));
+    QVERIFY(fsrc.open(QFile::ReadOnly));
+    QCOMPARE(fsrc.readAll().trimmed(),
+             QByteArrayLiteral("This is the test data found in QT_TESTCASE_SOURCEDIR."));
+
+    QFile fbuild(QFINDTESTDATA("level2/testdata_build.txt"));
+    QVERIFY(fbuild.open(QFile::ReadOnly));
+    QCOMPARE(fbuild.readAll().trimmed(),
+             QByteArrayLiteral("This is the test data found in custom QT_TESTCASE_BUILDDIR."));
+}
+
+QTEST_MAIN(TestClass)
+#include "main.moc"
diff --git a/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/testdata.txt b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/testdata.txt
new file mode 100644
index 0000000000..96a369071b
--- /dev/null
+++ b/tests/auto/cmake/test_QT_TESTCASE_BUILDDIR/testdata.txt
@@ -0,0 +1 @@
+This is the test data found in custom QT_TESTCASE_BUILDDIR.