[PATCH v2 1/2] scrrun/tests: Add tests for Empty dictionary keys.

[Francis De Brabandere]

From: Francis De Brabandere <[e-mail]>

An Empty key matches the zero/default value of the other key's type: any
numeric zero or the empty string, but not a non-zero number, a non-empty
string, or Null.
---
 dlls/scrrun/tests/dictionary.c | 82 ++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/dlls/scrrun/tests/dictionary.c b/dlls/scrrun/tests/dictionary.c
index e1cb33c45a7..9e526845fc0 100644
--- a/dlls/scrrun/tests/dictionary.c
+++ b/dlls/scrrun/tests/dictionary.c
@@ -1050,6 +1050,87 @@ static void test_Add(void)
     IDictionary_Release(dict);
 }
 
+/* Add two keys to a fresh dictionary; returns TRUE if the second key is
+ * treated as a duplicate of the first. */
+static BOOL keys_match(VARIANT *key1, VARIANT *key2)
+{
+    IDictionary *dict;
+    VARIANT item;
+    HRESULT hr;
+
+    if (FAILED(CoCreateInstance(&CLSID_Dictionary, NULL, CLSCTX_INPROC_SERVER|CLSCTX_INPROC_HANDLER,
+            &IID_IDictionary, (void**)&dict)))
+        return FALSE;
+
+    V_VT(&item) = VT_I2;
+    V_I2(&item) = 1;
+    if (FAILED(IDictionary_Add(dict, key1, &item)))
+    {
+        IDictionary_Release(dict);
+        return FALSE;
+    }
+
+    hr = IDictionary_Add(dict, key2, &item);
+    IDictionary_Release(dict);
+    return hr == CTL_E_KEY_ALREADY_EXISTS;
+}
+
+static void test_empty_key(void)
+{
+    static const VARTYPE zero_keys[] = {
+        VT_I2, VT_I4, VT_UI1, VT_R4, VT_R8, VT_DATE,
+    };
+    VARIANT a, b;
+    unsigned i;
+
+    /* Empty matches the zero/default value of any numeric type. */
+    for (i = 0; i < ARRAY_SIZE(zero_keys); i++)
+    {
+        V_VT(&a) = VT_EMPTY;
+        V_VT(&b) = zero_keys[i];
+        if (zero_keys[i] == VT_R8 || zero_keys[i] == VT_DATE)
+            V_R8(&b) = 0.0;
+        else if (zero_keys[i] == VT_R4)
+            V_R4(&b) = 0.0f;
+        else
+            V_I4(&b) = 0;
+        todo_wine ok(keys_match(&a, &b), "Empty should match zero key vt %d\n", zero_keys[i]);
+    }
+
+    /* Empty matches the empty string, but not a non-empty one. */
+    V_VT(&a) = VT_EMPTY;
+    V_VT(&b) = VT_BSTR;
+    V_BSTR(&b) = SysAllocString(L"");
+    todo_wine ok(keys_match(&a, &b), "Empty should match empty string\n");
+    VariantClear(&b);
+
+    V_VT(&b) = VT_BSTR;
+    V_BSTR(&b) = SysAllocString(L"0");
+    ok(!keys_match(&a, &b), "Empty should not match \"0\"\n");
+    VariantClear(&b);
+
+    /* Empty does not match a non-zero number or Null. */
+    V_VT(&b) = VT_I2;
+    V_I2(&b) = 5;
+    ok(!keys_match(&a, &b), "Empty should not match I2 5\n");
+
+    V_VT(&b) = VT_NULL;
+    ok(!keys_match(&a, &b), "Empty should not match Null\n");
+
+    /* A numeric zero does not match the empty string (only Empty bridges). */
+    V_VT(&a) = VT_I2;
+    V_I2(&a) = 0;
+    V_VT(&b) = VT_BSTR;
+    V_BSTR(&b) = SysAllocString(L"");
+    ok(!keys_match(&a, &b), "I2 0 should not match empty string\n");
+    VariantClear(&b);
+
+    /* Null matches only Null. */
+    V_VT(&a) = VT_NULL;
+    V_VT(&b) = VT_NULL;
+    ok(keys_match(&a, &b), "Null should match Null\n");
+}
+
 static void test_IEnumVARIANT(void)
 {
     IUnknown *enum1, *enum2;
@@ -1230,6 +1311,7 @@ START_TEST(dictionary)
     test_Remove();
     test_Item();
     test_Add();
+    test_empty_key();
     test_IEnumVARIANT();
     test_putref_Item();
 
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/10960