user32/tests: Add tests for for invalid DDE conditions.

dlls/user32/tests/dde.c

@@ -1372,6 +1372,53 @@ todo_wine {
     DestroyWindow(hwnd_server);
 }
 
+static void test_initialisation(void)
+{
+    UINT ret;
+    DWORD res;
+    HDDEDATA hdata;
+    HSZ server, topic, item;
+    DWORD client_pid;
+    HCONV conversation;
+
+    /* Initialise without a valid server window. */
+    client_pid = 0;
+    ret = DdeInitializeA(&client_pid, client_ddeml_callback, APPCMD_CLIENTONLY, 0);
+    ok(ret == DMLERR_NO_ERROR, "Expected DMLERR_NO_ERROR, got %d\n", ret);
+
+
+    server = DdeCreateStringHandleA(client_pid, "TestDDEService", CP_WINANSI);
+    topic = DdeCreateStringHandleA(client_pid, "TestDDETopic", CP_WINANSI);
+
+    DdeGetLastError(client_pid);
+
+    /* There is no server window so no conversation can be extracted */
+    conversation = DdeConnect(client_pid, server, topic, NULL);
+    ok(conversation == NULL, "Expected NULL conversation, %p\n", conversation);
+    ret = DdeGetLastError(client_pid);
+    ok(ret == DMLERR_NO_CONV_ESTABLISHED, "Expected DMLERR_NO_CONV_ESTABLISHED, got %d\n", ret);
+
+    DdeFreeStringHandle(client_pid, server);
+
+    item = DdeCreateStringHandleA(client_pid, "request", CP_WINANSI);
+
+    /* There is no converstation so an invalild parameter results */
+    res = 0xdeadbeef;
+    DdeGetLastError(client_pid);
+    hdata = DdeClientTransaction(NULL, 0, conversation, item, CF_TEXT, XTYP_REQUEST, default_timeout, &res);
+    ret = DdeGetLastError(client_pid);
+todo_wine
+    ok(ret == DMLERR_INVALIDPARAMETER, "Expected DMLERR_INVALIDPARAMETER, got %d\n", ret);
+    ok(res == 0xdeadbeef, "Expected 0xdeadbeef, got %08x\n", res);
+
+    DdeFreeStringHandle(client_pid, server);
+    ret = DdeDisconnect(conversation);
+    ok(ret == FALSE, "Expected FALSE, got %d\n", ret);
+
+    ret = DdeUninitialize(client_pid);
+    ok(ret == TRUE, "Expected TRUE, got %d\n", ret);
+}
+
 static void test_DdeCreateStringHandleW(DWORD dde_inst, int codepage)
 {
     static const WCHAR dde_string[] = {'D','D','E',' ','S','t','r','i','n','g',0};
@@ -2088,6 +2135,8 @@ START_TEST(dde)
         return;
     }
 
+    test_initialisation();
+
     ZeroMemory(&startup, sizeof(STARTUPINFO));
     sprintf(buffer, "%s dde ddeml", argv[0]);
     startup.cb = sizeof(startup);