Add build test for Flutter codelabs

.travis.yml

@@ -8,6 +8,7 @@ env:
   - SHARD=tests
   - SHARD=docs
   - SHARD=build_and_deploy_gallery
+  - SHARD=flutter_build_test
 matrix:
   exclude:
   - os: osx

dev/bots/flutter_build_test.sh

+#!/bin/bash
+
+readonly SCRIPTS_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+readonly ROOT_DIR="$SCRIPTS_DIR/.."
+
+function is_expected_failure() {
+  # A test target was specified with the 'build' command.
+  grep --quiet "is not configured for Running" "$1"
+}
+
+# Navigate to codelab and attempt to build 104-complete
+echo "git clone https://github.com/material-components/material-components-flutter-codelabs.git"
+git clone https://github.com/material-components/material-components-flutter-codelabs.git
+
+echo "cd material-components-flutter-codelabs/mdc_100_series/"
+cd material-components-flutter-codelabs/mdc_100_series/
+
+echo "git checkout 104-complete"
+git checkout 104-complete
+
+log_file="build_log_for_104_complete.txt"
+build_command="flutter build bundle"
+
+all_builds_ok=1
+echo "$build_command"
+$build_command 2>&1 | tee "$log_file"
+
+if [ ${PIPESTATUS[0]} -eq 0 ] || is_expected_failure "$log_file"; then
+    rm "$log_file"
+else
+    all_builds_ok=0
+    echo
+    echo "Log left in $log_file."
+    echo
+fi
+
+# If any build failed, exit with a failure exit status so continuous integration
+# tools can react appropriately.
+if [ "$all_builds_ok" -eq 1 ]; then
+    exit 0
+else
+    exit 1
+fi

dev/bots/travis_script.sh

@@ -59,5 +59,9 @@ elif [ "$SHARD" = "docs" ]; then
     ./dev/bots/docs.sh
   fi
 else
-  dart ./dev/bots/test.dart
+  if [ "$SHARD" = "flutter_build_test" ]; then
+    ./dev/bots/flutter_build_test.sh
+  else
+    dart ./dev/bots/test.dart
+  fi
 fi