Split run_unit_tests.sh into components

Split run_unit_tests.sh into components to allow easy execution per
component being worked on.

Also made device side setup more tolerant to different number of devices
connected to the host.

Change-Id: I61fc304f48fb0a74de781494ee5f5daf80a7bf2c
diff --git a/test_defs.sh b/test_defs.sh
new file mode 100644
index 0000000..5d5090d
--- /dev/null
+++ b/test_defs.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Copyright (C) 2015 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.
+
+# Common tools for running unit tests of the compatibility libs
+
+JAR_DIR=${ANDROID_HOST_OUT}/framework
+TF_CONSOLE=com.android.tradefed.command.Console
+
+COMMON_JARS="
+    ddmlib-prebuilt\
+    hosttestlib\
+    tradefed-prebuilt"
+
+checkFile() {
+    if [ ! -f "$1" ]; then
+        echo "Unable to locate $1"
+        exit
+    fi;
+}
+
+build_jar_path() {
+    JAR_PATH=
+    for JAR in ${2} ${COMMON_JARS}; do
+        checkFile ${1}/${JAR}.jar
+        JAR_PATH=${JAR_PATH}:${1}/${JAR}.jar
+    done
+}
+
+run_tests() {
+    build_jar_path "${JAR_DIR}" "${2}"
+    for CLASS in ${1}; do
+        java $RDBG_FLAG -cp ${JAR_PATH} ${TF_CONSOLE} run singleCommand host -n --class ${CLASS} ${3}
+    done
+}