Create helper script for running cts-tradefed-tests

Change-Id: I1ca2e8cf4db242c2ff4736815aeeb105df83bc7c
diff --git a/tools/tradefed-host/tests/run_unit_tests.sh b/tools/tradefed-host/tests/run_unit_tests.sh
new file mode 100755
index 0000000..fc19a02
--- /dev/null
+++ b/tools/tradefed-host/tests/run_unit_tests.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Copyright (C) 2012 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# helper script for running the cts-tradefed unit tests
+
+checkFile() {
+    if [ ! -f "$1" ]; then
+        echo "Unable to locate $1"
+        exit
+    fi;
+}
+
+# check if in Android build env
+if [ ! -z ${ANDROID_BUILD_TOP} ]; then
+    HOST=`uname`
+    if [ "$HOST" == "Linux" ]; then
+        OS="linux-x86"
+    elif [ "$HOST" == "Darwin" ]; then
+        OS="darwin-x86"
+    else
+        echo "Unrecognized OS"
+        exit
+    fi;
+fi;
+
+JAR_DIR=${ANDROID_BUILD_TOP}/out/host/$OS/framework
+JARS="ddmlib-prebuilt.jar tradefed-prebuilt.jar hosttestlib.jar cts-tradefed.jar cts-tradefed-tests.jar"
+
+for JAR in $JARS; do
+    checkFile ${JAR_DIR}/${JAR}
+    JAR_PATH=${JAR_PATH}:${JAR_DIR}/${JAR}
+done
+
+java $RDBG_FLAG \
+  -cp ${JAR_PATH} com.android.tradefed.command.Console run singleCommand host -n --class com.android.cts.tradefed.UnitTests "$@"
+