explorer/tests: Add taskbar tests.

configure

@@ -22063,6 +22063,7 @@ wine_fn_config_makefile programs/dxdiag enable_dxdiag
 wine_fn_config_makefile programs/eject enable_eject
 wine_fn_config_makefile programs/expand enable_expand
 wine_fn_config_makefile programs/explorer enable_explorer
+wine_fn_config_makefile programs/explorer/tests enable_tests
 wine_fn_config_makefile programs/extrac32 enable_extrac32
 wine_fn_config_makefile programs/fc enable_fc
 wine_fn_config_makefile programs/find enable_find

configure.ac

@@ -3348,6 +3348,7 @@ WINE_CONFIG_MAKEFILE(programs/dxdiag)
 WINE_CONFIG_MAKEFILE(programs/eject)
 WINE_CONFIG_MAKEFILE(programs/expand)
 WINE_CONFIG_MAKEFILE(programs/explorer)
+WINE_CONFIG_MAKEFILE(programs/explorer/tests)
 WINE_CONFIG_MAKEFILE(programs/extrac32)
 WINE_CONFIG_MAKEFILE(programs/fc)
 WINE_CONFIG_MAKEFILE(programs/find)

programs/explorer/tests/Makefile.in

+TESTDLL = explorer.exe
+IMPORTS = user32
+
+C_SRCS = \
+	explorer.c

programs/explorer/tests/explorer.c

+/*
+ * Explorer.exe tests
+ *
+ * Copyright 2022 Zhiyi Zhang for CodeWeavers
+ *
+ * This library 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.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <windows.h>
+#include "wine/test.h"
+
+static void test_taskbar(void)
+{
+    RECT taskbar_rect, expected_rect, primary_rect, work_rect;
+    HWND hwnd;
+    BOOL ret;
+
+    hwnd = FindWindowA("Shell_TrayWnd", NULL);
+    if (!hwnd)
+    {
+        skip("Failed to find the taskbar window.\n");
+        return;
+    }
+
+    ret = GetWindowRect(hwnd, &taskbar_rect);
+    ok(ret, "GetWindowRect failed, error %ld.\n", GetLastError());
+
+    SystemParametersInfoW(SPI_GETWORKAREA, 0, &work_rect, 0);
+    SetRect(&primary_rect, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));
+    SubtractRect(&expected_rect, &primary_rect, &work_rect);
+    todo_wine
+    ok(EqualRect(&taskbar_rect, &expected_rect), "Expected %s, got %s.\n",
+       wine_dbgstr_rect(&expected_rect), wine_dbgstr_rect(&taskbar_rect));
+}
+
+START_TEST(explorer)
+{
+    test_taskbar();
+}