pro2cmake: Add a blackbox test for converting from qmake to CMake

If you can set the environment variable DEBUG_PRO2CMAKE_TEST_CONVERSION
to 1, the output of pro2cmake is written to the temp directory.  This
helps analysing test failures.

Change-Id: Ida42c5b76a67172d00ce0d2488adc7fb376c6b11
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

util/cmake/tests/data/conversion/required_qt_modules.pro

@@ -0,0 +1,3 @@
+TARGET = myapp
+QT = core network widgets
+SOURCES = main.cpp

util/cmake/tests/test_conversion.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+#############################################################################
+##
+## Copyright (C) 2022 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the plugins 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.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from pro2cmake import Scope, SetOperation, merge_scopes, recursive_evaluate_scope
+from tempfile import TemporaryDirectory
+
+import os
+import pathlib
+import pytest
+import re
+import shutil
+import subprocess
+import tempfile
+import typing
+
+debug_mode = bool(os.environ.get("DEBUG_PRO2CMAKE_TEST_CONVERSION"))
+test_script_dir = pathlib.Path(__file__).parent.resolve()
+pro2cmake_dir = test_script_dir.parent.resolve()
+pro2cmake_py = pro2cmake_dir.joinpath("pro2cmake.py")
+test_data_dir = test_script_dir.joinpath("data", "conversion")
+
+
+def convert(base_name: str):
+    pro_file_name = str(base_name) + ".pro"
+    pro_file_path = test_data_dir.joinpath(pro_file_name)
+    assert(pro_file_path.exists())
+    with TemporaryDirectory(prefix="testqmake2cmake") as tmp_dir_str:
+        tmp_dir = pathlib.Path(tmp_dir_str)
+        output_file_path = tmp_dir.joinpath("CMakeLists.txt")
+        exit_code = subprocess.call([pro2cmake_py, "--is-example", "-o", output_file_path, pro_file_path])
+        assert(exit_code == 0)
+        if debug_mode:
+            shutil.copyfile(output_file_path, tempfile.gettempdir() + "/pro2cmake/CMakeLists.txt")
+        f = open(output_file_path, "r")
+        assert(f)
+        content = f.read()
+        assert(content)
+        return content
+
+
+def test_qt_modules():
+    output = convert("required_qt_modules")
+    find_package_lines = []
+    for line in output.split("\n"):
+        if "find_package(" in line:
+            find_package_lines.append(line.strip())
+    assert(["find_package(Qt6 REQUIRED COMPONENTS Core Network Widgets)"] == find_package_lines)