diff --git a/src/terminal/adapter/ut_adapter/adapterTest.cpp b/src/terminal/adapter/ut_adapter/adapterTest.cpp
index fe836e2f12ee..e97ca42e8c2e 100644
--- a/src/terminal/adapter/ut_adapter/adapterTest.cpp
+++ b/src/terminal/adapter/ut_adapter/adapterTest.cpp
@@ -1684,6 +1684,40 @@ class AdapterTest
         _testGetSet->ValidateInputEvent(L"\033P0$r\033\\");
     }
 
+    TEST_METHOD(RequestModeTests)
+    {
+        BEGIN_TEST_METHOD_PROPERTIES()
+            TEST_METHOD_PROPERTY(L"Data:modeNumber", L"{1, 3, 5, 6, 8, 12, 25, 40, 66, 67, 1000, 1002, 1003, 1004, 1005, 1006, 1007, 1049, 9001}")
+        END_TEST_METHOD_PROPERTIES()
+
+        VTInt modeNumber;
+        VERIFY_SUCCEEDED_RETURN(TestData::TryGetValue(L"modeNumber", modeNumber));
+        const auto mode = DispatchTypes::DECPrivateMode(modeNumber);
+
+        if (mode == DispatchTypes::DECCOLM_SetNumberOfColumns)
+        {
+            Log::Comment(L"Make sure DECCOLM is allowed");
+            VERIFY_IS_TRUE(_pDispatch->SetMode(DispatchTypes::XTERM_EnableDECCOLMSupport));
+        }
+
+        Log::Comment(NoThrowString().Format(L"Setting private mode %d", modeNumber));
+        _testGetSet->PrepData();
+        VERIFY_IS_TRUE(_pDispatch->SetMode(mode));
+        VERIFY_IS_TRUE(_pDispatch->RequestMode(mode));
+
+        wchar_t expectedResponse[20];
+        swprintf_s(expectedResponse, ARRAYSIZE(expectedResponse), L"\x1b[?%d;1$y", modeNumber);
+        _testGetSet->ValidateInputEvent(expectedResponse);
+
+        Log::Comment(NoThrowString().Format(L"Resetting private mode %d", modeNumber));
+        _testGetSet->PrepData();
+        VERIFY_IS_TRUE(_pDispatch->ResetMode(mode));
+        VERIFY_IS_TRUE(_pDispatch->RequestMode(mode));
+
+        swprintf_s(expectedResponse, ARRAYSIZE(expectedResponse), L"\x1b[?%d;2$y", modeNumber);
+        _testGetSet->ValidateInputEvent(expectedResponse);
+    }
+
     TEST_METHOD(CursorKeysModeTest)
     {
         Log::Comment(L"Starting test...");