shell32/tests: Test ExtractIcon() with an empty/invalid path.

dlls/shell32/tests/shelllink.c

@@ -1174,6 +1174,7 @@ static void test_ExtractIcon(void)
 {
     static const WCHAR nameW[] = {'\\','e','x','t','r','a','c','t','i','c','o','n','_','t','e','s','t','.','t','x','t',0};
     static const WCHAR shell32W[] = {'s','h','e','l','l','3','2','.','d','l','l',0};
+    static const WCHAR emptyW[] = {0};
     WCHAR pathW[MAX_PATH];
     HICON hicon, hicon2;
     char path[MAX_PATH];
@@ -1223,6 +1224,14 @@ static void test_ExtractIcon(void)
     r = DeleteFileA(path);
     ok(r, "failed to delete file %s (%ld)\n", path, GetLastError());
 
+    /* Empty file path */
+    hicon = ExtractIconA(NULL, "", -1);
+    ok(hicon == NULL, "Got icon %p\n", hicon);
+
+    hicon = ExtractIconA(NULL, "", 0);
+    todo_wine
+    ok(hicon == NULL, "Got icon %p\n", hicon);
+
     /* same for W variant */
 if (0)
 {
@@ -1270,6 +1279,14 @@ if (0)
 
     r = DeleteFileW(pathW);
     ok(r, "failed to delete file %s (%ld)\n", path, GetLastError());
+
+    /* Empty file path */
+    hicon = ExtractIconW(NULL, emptyW, -1);
+    ok(hicon == NULL, "Got icon %p\n", hicon);
+
+    hicon = ExtractIconW(NULL, emptyW, 0);
+    todo_wine
+    ok(hicon == NULL, "Got icon %p\n", hicon);
 }
 
 static void test_ExtractAssociatedIcon(void)