Add Rust to Appveyor config. (#4928)

tests/RustTest.bat

@@ -0,0 +1,22 @@
+@echo off
+rem Copyright 2018 Google Inc. All rights reserved.
+rem
+rem Licensed under the Apache License, Version 2.0 (the "License");
+rem you may not use this file except in compliance with the License.
+rem You may obtain a copy of the License at
+rem
+rem     http://www.apache.org/licenses/LICENSE-2.0
+rem
+rem Unless required by applicable law or agreed to in writing, software
+rem distributed under the License is distributed on an "AS IS" BASIS,
+rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+rem See the License for the specific language governing permissions and
+rem limitations under the License.
+
+rem Compile then run the Rust test.
+
+rem TODO(rw): how do we make this script abort the calling script in appveyor?
+
+cd rust_usage_test
+cargo test -- --quiet || exit /b 1
+cd ..

tests/RustTest.sh

@@ -1,4 +1,4 @@
-#!/bin/bash 
+#!/bin/bash
 set -ex
 #
 # Copyright 2018 Google Inc. All rights reserved.
@@ -16,7 +16,7 @@ set -ex
 # limitations under the License.
 
 cd ./rust_usage_test
-cargo test $1
+cargo test -- --quiet
 TEST_RESULT=$?
 if [[ $TEST_RESULT  == 0 ]]; then
     echo "OK: Rust tests passed."