add host backend under ctest (#637)

test/CMakeLists.txt

@@ -258,3 +258,17 @@ add_test(
             --test-command "videodecodergb"
             -i "${ROCM_PATH}/share/rocdecode/video/AMD_driving_virtual_20-H265.mp4" -resize 640x360 -of rgb
 )
+
+# 15 - videoDecode Host backend
+add_test(
+  NAME
+    video_decode-Host-Backend
+  COMMAND
+    "${CMAKE_CTEST_COMMAND}"
+            --build-and-test "${ROCM_PATH}/share/rocdecode/samples/videoDecode"
+                              "${CMAKE_CURRENT_BINARY_DIR}/videoDecode"
+            --build-generator "${CMAKE_GENERATOR}"
+            --test-command "videodecode"
+            -i ${ROCM_PATH}/share/rocdecode/video/AMD_driving_virtual_20-H265.mp4
+            -backend 1
+)