Tests: Add test framework for BackupPolicy

tests/src/App/BackupPolicy.cpp

@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/****************************************************************************
+ *   Copyright (c) 2025 The FreeCAD project association AISBL               *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
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+ *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+
+#include "InitApplication.h"
+
+#include <App/BackupPolicy.h>
+
+#include <filesystem>
+#include <fstream>
+#include <random>
+#include <string>
+
+
+class BackupPolicyTest: public ::testing::Test
+{
+protected:
+    static void SetUpTestSuite()
+    {
+        tests::initApplication();
+    }
+
+    void SetUp() override
+    {
+        _tempDir = std::filesystem::temp_directory_path() / ("fc_backup_policy-" + randomString(16));
+        std::filesystem::create_directory(_tempDir);
+    }
+
+    void TearDown() override
+    {
+        std::filesystem::remove_all(_tempDir);
+    }
+
+    void apply(const std::string& sourcename, const std::string& targetname)
+    {
+        _policy.apply(sourcename, targetname);
+    }
+
+    void setPolicyTerms(App::BackupPolicy::Policy p, int count, bool useExt, const std::string& fmt)
+    {
+        _policy.setPolicy(p);
+        _policy.setNumberOfFiles(count);
+        _policy.useBackupExtension(useExt);
+        _policy.setDateFormat(fmt);
+    }
+
+    // Create a named temporary file: returns the full path to the new file. Deleted by the TearDown
+    // method at the end of the test.
+    std::filesystem::path createTempFile(const std::string& filename)
+    {
+        std::filesystem::path p = _tempDir / filename;
+        std::ofstream fileStream(p.string());
+        fileStream << "Test data";
+        fileStream.close();
+        return p;
+    }
+
+
+private:
+
+    std::string randomString(size_t length)
+    {
+        static constexpr std::string_view chars =
+            "0123456789"
+            "abcdefghijklmnopqrstuvwxyz"
+            "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+        std::random_device rd;
+        std::mt19937 gen(rd());
+        std::uniform_int_distribution<> dis(0, static_cast<int>(chars.size()) - 1);
+
+        std::string result;
+        result.reserve(length);
+
+        std::ranges::generate_n(std::back_inserter(result), length, [&]() {
+            return chars[dis(gen)];
+        });
+
+        return result;
+    }
+
+    App::BackupPolicy _policy;
+    std::filesystem::path _tempDir;
+
+};
+
+TEST_F(BackupPolicyTest, StandardSourceDoesNotExist)
+{
+    // Arrange
+    setPolicyTerms(App::BackupPolicy::Policy::Standard, 1, true, "%Y-%m-%d_%H-%M-%S");
+
+    // Act & Assert
+    EXPECT_THROW(apply("nonexistent.fcstd", "backup.fcstd"), Base::FileException);
+}