user32/tests: Add some SetDlgItemTextA tests

[Bruno Jesus]

This patch was an attempt to reproduce the issue in bug 35621, I could not
get what I wanted but at least here I got the following error covered in a
todo:

dialog.c:1022: Test failed: GetDlgItemText error, expected 102400, got
80968.
dialog.c:1023: Test failed: Different text read.
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diff --git a/dlls/user32/tests/dialog.c b/dlls/user32/tests/dialog.c
index ef72cfe..99bf79a 100644
--- a/dlls/user32/tests/dialog.c
+++ b/dlls/user32/tests/dialog.c
@@ -982,6 +982,58 @@ static void test_GetDlgItemText(void)
        "string retrieved using GetDlgItemText should have been NULL terminated\n");
 }
 
+static void test_SetDlgItemText(void)
+{
+    HWND hwnd, child;
+    char *strin, *strout;
+    BOOL ret;
+    int i, copied;
+    struct _tests
+    {
+      int size, todo;
+    } tests[] = {{1, 0}, {256,0}, {1024,0}, {10240,0}, {102400, 1}};
+
+    hwnd = CreateWindowA("button", "parent", WS_VISIBLE, 0, 0, 100, 100, NULL, 0, g_hinst, NULL);
+    ok(hwnd != NULL, "failed to created window\n");
+    child = CreateWindowA("edit", "child", WS_VISIBLE|WS_CHILD, 0, 0, 10, 10, hwnd, 0, g_hinst, NULL);
+    ok(child != NULL, "failed to created child window\n");
+
+    i = tests[sizeof(tests) / sizeof(tests[0]) - 1].size;
+    strin = HeapAlloc(GetProcessHeap(), 0, i + 1);
+    strout = HeapAlloc(GetProcessHeap(), 0, i + 1);
+    if (!strin || !strout)
+    {
+        skip("Out of memory for SetDlgItemText tests\n");
+        goto cleanup;
+    }
+
+    for (i = 0; i < sizeof(tests)/sizeof(tests[0]); i++)
+    {
+        FillMemory(strout, tests[i].size, 0);
+        FillMemory(strin, tests[i].size, ' ');
+        strin[tests[i].size] = 0;
+        ret = SetDlgItemTextA(hwnd, 0, strin);
+        ok(ret, "SetDlgItemText error, expected TRUE, got FALSE.\n");
+        copied = GetDlgItemTextA(hwnd, 0, strout, tests[i].size + 1);
+
+        if(tests[i].todo)
+            winetest_start_todo("wine");
+
+        ok(copied == tests[i].size, "GetDlgItemText error, expected %d, got %d.\n", tests[i].size, copied);
+        ok(!strcmp(strin, strout), "Different text read.\n");
+
+        if(tests[i].todo)
+            winetest_end_todo("wine");
+    }
+
+cleanup:
+    HeapFree(GetProcessHeap(), 0, strin);
+    HeapFree(GetProcessHeap(), 0, strout);
+
+    DestroyWindow(child);
+    DestroyWindow(hwnd);
+}
+
 static void test_GetDlgItem(void)
 {
     HWND hwnd, child1, child2, hwnd2;
@@ -1435,6 +1487,7 @@ START_TEST(dialog)
     test_focus();
     test_GetDlgItem();
     test_GetDlgItemText();
+    test_SetDlgItemText();
     test_DialogBoxParamA();
     test_DisabledDialogTest();
     test_MessageBoxFontTest();