Cleanup: Extract asset test class into own header

This manages setting up asset library directories for testing, which is
useful for testing multiple asset library related compontents. So move
it to a common header. No reason to squeeze everything into one file
then.

source/blender/asset_system/CMakeLists.txt

@@ -46,10 +46,12 @@ blender_add_lib(bf_asset_system "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
 
 if(WITH_GTESTS)
   set(TEST_SRC
-    tests/asset_catalog_test.cc
     tests/asset_catalog_path_test.cc
+    tests/asset_catalog_test.cc
     tests/asset_library_service_test.cc
     tests/asset_library_test.cc
+
+    tests/asset_library_test_common.hh
   )
   set(TEST_LIB
     bf_asset_system

source/blender/asset_system/tests/asset_catalog_test.cc

@@ -17,6 +17,8 @@
 
 #include "testing/testing.h"
 
+#include "asset_library_test_common.hh"
+
 namespace blender::asset_system::tests {
 
 /* UUIDs from lib/tests/asset_library/blender_assets.cats.txt */
@@ -76,59 +78,8 @@ class TestableAssetCatalogService : public AssetCatalogService {
   }
 };
 
-class AssetCatalogTest : public testing::Test {
+class AssetCatalogTest : public AssetLibraryTestBase {
  protected:
-  CatalogFilePath asset_library_root_;
-  CatalogFilePath temp_library_path_;
-
-  static void SetUpTestSuite()
-  {
-    testing::Test::SetUpTestSuite();
-    CLG_init();
-  }
-
-  static void TearDownTestSuite()
-  {
-    CLG_exit();
-    testing::Test::TearDownTestSuite();
-  }
-
-  void SetUp() override
-  {
-    const std::string test_files_dir = blender::tests::flags_test_asset_dir();
-    if (test_files_dir.empty()) {
-      FAIL();
-    }
-
-    asset_library_root_ = test_files_dir + SEP_STR + "asset_library";
-    temp_library_path_ = "";
-  }
-
-  void TearDown() override
-  {
-    if (!temp_library_path_.empty()) {
-      BLI_delete(temp_library_path_.c_str(), true, true);
-      temp_library_path_ = "";
-    }
-  }
-
-  /* Register a temporary path, which will be removed at the end of the test.
-   * The returned path ends in a slash. */
-  CatalogFilePath use_temp_path()
-  {
-    BKE_tempdir_init("");
-    const CatalogFilePath tempdir = BKE_tempdir_session();
-    temp_library_path_ = tempdir + "test-temporary-path" + SEP_STR;
-    return temp_library_path_;
-  }
-
-  CatalogFilePath create_temp_path()
-  {
-    CatalogFilePath path = use_temp_path();
-    BLI_dir_create_recursive(path.c_str());
-    return path;
-  }
-
   void assert_expected_item(const AssetCatalogPath &expected_path,
                             const AssetCatalogTreeItem &actual_item)
   {

source/blender/asset_system/tests/asset_library_test_common.hh

@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include <string>
+
+#include "BKE_appdir.h"
+
+#include "BLI_fileops.h"
+#include "BLI_path_util.h"
+
+#include "CLG_log.h"
+
+#include "testing/testing.h"
+
+namespace blender::asset_system::tests {
+
+/**
+ * Functionality to setup and access directories on disk within which asset library related testing
+ * can be done.
+ */
+class AssetLibraryTestBase : public testing::Test {
+ protected:
+  std::string asset_library_root_;
+  std::string temp_library_path_;
+
+  static void SetUpTestSuite()
+  {
+    testing::Test::SetUpTestSuite();
+    CLG_init();
+  }
+
+  static void TearDownTestSuite()
+  {
+    CLG_exit();
+    testing::Test::TearDownTestSuite();
+  }
+
+  void SetUp() override
+  {
+    const std::string test_files_dir = blender::tests::flags_test_asset_dir();
+    if (test_files_dir.empty()) {
+      FAIL();
+    }
+
+    asset_library_root_ = test_files_dir + SEP_STR + "asset_library";
+    temp_library_path_ = "";
+  }
+
+  void TearDown() override
+  {
+    if (!temp_library_path_.empty()) {
+      BLI_delete(temp_library_path_.c_str(), true, true);
+      temp_library_path_ = "";
+    }
+  }
+
+  /* Register a temporary path, which will be removed at the end of the test.
+   * The returned path ends in a slash. */
+  std::string use_temp_path()
+  {
+    BKE_tempdir_init("");
+    const std::string tempdir = BKE_tempdir_session();
+    temp_library_path_ = tempdir + "test-temporary-path" + SEP_STR;
+    return temp_library_path_;
+  }
+
+  std::string create_temp_path()
+  {
+    std::string path = use_temp_path();
+    BLI_dir_create_recursive(path.c_str());
+    return path;
+  }
+};
+
+}  // namespace blender::asset_system::tests