Enable Web tests and make sure to install right channel (#390)

.github/workflows/dart.yml

@@ -50,12 +50,30 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         sdk: [stable, dev]
+        platform: [vm, chrome]
+        exclude:
+          # We only run Chrome tests on Linux. No need to run them
+          # on Windows and Mac because they are platform independent.
+          - os: windows-latest
+            platform: chrome
+          - os: macos-latest
+            platform: chrome
     steps:
       - uses: actions/checkout@v2
       - uses: cedx/setup-dart@v2
+        with:
+          release-channel: ${{ matrix.sdk }}
       - name: Report version
         run: dart --version
+      - name: Install grpcwebproxy
+        if: ${{ matrix.platform == 'chrome' }}
+        run: |
+          ./tool/install-grpcwebproxy.sh
+          echo "/tmp/grpcwebproxy" >> $GITHUB_PATH
+        env:
+          MATRIX_OS: ${{ matrix.os }}
+        shell: bash
       - name: Install dependencies
         run: dart pub get
       - name: Run tests
-        run: dart test
+        run: dart test --platform ${{ matrix.platform }}

tool/install-grpcwebproxy.sh

@@ -1,7 +1,10 @@
 #!/bin/sh
 
+set -ex
+
 VERSION=v0.13.0
 SUFFIX=
+WGET=wget
 
 case $TRAVIS_OS_NAME in
   linux)
@@ -16,9 +19,23 @@ case $TRAVIS_OS_NAME in
     ;;
 esac
 
+case $MATRIX_OS in
+  ubuntu-latest)
+    VARIANT=linux-x86_64
+    ;;
+  macos-latest)
+    VARIANT=osx-x86_64
+    ;;
+  windows-latest)
+    VARIANT=win64.exe
+    SUFFIX=.exe
+    WGET=C:/msys64/usr/bin/wget.exe
+    ;;
+esac
+
 BINARY=grpcwebproxy-${VERSION}-${VARIANT}
 
-wget https://github.com/improbable-eng/grpc-web/releases/download/${VERSION}/${BINARY}.zip -O /tmp/grpcwebproxy.zip
+${WGET} https://github.com/improbable-eng/grpc-web/releases/download/${VERSION}/${BINARY}.zip -O /tmp/grpcwebproxy.zip
 rm -rf /tmp/grpcwebproxy
 mkdir /tmp/grpcwebproxy
 cd /tmp/grpcwebproxy