Split wxPersistenceManager-related tests and actually build them

It seems better to organize the tests in different files and just
provide a common fixture-like class to reuse functionality.

Also use this as an opportunity to rewrite the tests to use Catch
directly instead of using CppUnit-compatible macros.

Finally, actually build these tests as part of the test suite.

tests/persistence/tlw.cpp

@@ -0,0 +1,95 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        tests/persistence/persistence.cpp
+// Purpose:     wxTLW persistence support unit test
+// Author:      wxWidgets Team
+// Created:     2017-08-23
+// Copyright:   (c) 2017 wxWidgets Team
+///////////////////////////////////////////////////////////////////////////////
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#include "testprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#include "testpersistence.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/frame.h"
+#endif // WX_PRECOMP
+
+#include "wx/persist/toplevel.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+#define FRAME_OPTIONS_PREFIX   PO_PREFIX "/Window/frame"
+
+// ----------------------------------------------------------------------------
+// tests themselves
+// ----------------------------------------------------------------------------
+
+TEST_CASE_METHOD(PersistenceTests, "wxPersistTLW", "[persist][tlw]")
+{
+    // Create the objects to persist or restore.
+    wxFrame* const frame = new wxFrame(wxTheApp->GetTopWindow(), wxID_ANY, "wxTest");
+    frame->SetName("frame");
+
+    const wxPoint pos(100, 150);
+    const wxSize size(450, 350);
+
+    SECTION("Save")
+    {
+        // Set the geometry before saving.
+        frame->SetPosition(pos);
+        frame->SetSize(size);
+
+        wxPersistenceManager::Get().Register(frame);
+
+        // Destroy the frame immediately.
+        delete frame;
+
+        // Test that the relevant keys have been stored correctly.
+        int val;
+
+        const wxConfigBase* const conf = wxConfig::Get();
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/x", &val));
+        CHECK(pos.x == val);
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/y", &val));
+        CHECK(pos.y == val);
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/w", &val));
+        CHECK(size.x == val);
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/h", &val));
+        CHECK(size.y == val);
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/Iconized", &val));
+        CHECK(0 == val);
+
+        CHECK(conf->Read(FRAME_OPTIONS_PREFIX "/Maximized", &val));
+        CHECK(0 == val);
+    }
+
+    SECTION("Restore")
+    {
+        EnableCleanup();
+
+        // Test that the object was registered and restored.
+        CHECK(wxPersistenceManager::Get().RegisterAndRestore(frame));
+
+        CHECK(pos.x == frame->GetPosition().x);
+        CHECK(pos.y == frame->GetPosition().y);
+        CHECK(size.x == frame->GetSize().GetWidth());
+        CHECK(size.y == frame->GetSize().GetHeight());
+        CHECK(!frame->IsMaximized());
+        CHECK(!frame->IsIconized());
+    }
+}