gdi32: Add two basic tests to check what WidenPath does.

dlls/gdi32/tests/Makefile.in

@@ -16,6 +16,7 @@ CTESTS = \
 	mapping.c \
 	metafile.c \
 	palette.c \
+	path.c \
 	pen.c
 
 @MAKE_TEST_RULES@

dlls/gdi32/tests/path.c

@@ -0,0 +1,84 @@
+/*
+ * Unit test suite for paths
+ *
+ * Copyright 2007 Laurent Vromman
+ *
+ * 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 <stdarg.h>
+#include "windef.h"
+#include "winbase.h"
+#include "wingdi.h"
+
+#include "wine/test.h"
+
+#include "winuser.h"
+#include "winerror.h"
+
+static void test_widenpath(void)
+{
+    HDC hdc = GetDC(0);
+    HPEN greenPen;
+    HPEN oldPen;
+    POINT pnt[6];
+    INT nSize;
+
+    /* Create a pen to be used in WidenPath */
+    greenPen = CreatePen(PS_SOLID, 10, RGB(0,0,0));
+    oldPen = SelectObject(hdc, greenPen);
+
+    /* Prepare a path */
+    pnt[0].x = 100;
+    pnt[0].y = 0;
+    pnt[1].x = 200;
+    pnt[1].y = 0;
+    pnt[2].x = 300;
+    pnt[2].y = 100;
+    pnt[3].x = 300;
+    pnt[3].y = 200;
+    pnt[4].x = 200;
+    pnt[4].y = 300;
+    pnt[5].x = 100;
+    pnt[5].y = 300;
+
+    /* Set a polyline path */
+    BeginPath(hdc);
+    Polyline(hdc, pnt, 6);
+    EndPath(hdc);
+
+    /* Widen the polyline path */
+    ok(WidenPath(hdc), "WidenPath fails while widening a poyline path.\n");
+
+    /* Test if WidenPath seems to have done his job */
+    nSize = GetPath(hdc, NULL, NULL, 0);
+    ok(nSize != -1, "GetPath fails after calling WidenPath.\n");
+    ok(nSize > 6, "Path number of points is to low. Should be more than 6 but is %d\n", nSize);
+
+    todo_wine {
+        /* Test WidenPath with an empty path */
+        SetLastError(0xdeadbeef);
+        BeginPath(hdc);
+        ok(WidenPath(hdc) == FALSE, "WidenPath fails while widening an empty path. Error : %d\n", GetLastError());
+    }
+
+    ReleaseDC(0, hdc);
+    return;
+}
+
+START_TEST(path)
+{
+    test_widenpath();
+}