Throwing when goldctl cannot authorize/initialize (#45925)

packages/flutter_goldens/test/flutter_goldens_test.dart

@@ -53,9 +53,10 @@ void main() {
 
   group('SkiaGoldClient', () {
     SkiaGoldClient skiaClient;
+    Directory workDirectory;
 
     setUp(() {
-      final Directory workDirectory = fs.directory('/workDirectory')
+      workDirectory = fs.directory('/workDirectory')
         ..createSync(recursive: true);
       skiaClient = SkiaGoldClient(
         workDirectory,
@@ -66,8 +67,7 @@ void main() {
       );
     });
 
-    group('auth', () {
-      test('performs minimal work if already authorized', () async {
+    test('auth performs minimal work if already authorized', () async {
       fs.file('/workDirectory/temp/auth_opt.json')
         ..createSync(recursive: true);
       when(process.run(any))
@@ -80,6 +80,78 @@ void main() {
         workingDirectory: captureAnyNamed('workingDirectory'),
       ));
     });
+
+    test('throws for error state from auth', () async {
+      platform = FakePlatform(
+        environment: <String, String>{
+          'FLUTTER_ROOT': _kFlutterRoot,
+          'GOLD_SERVICE_ACCOUNT' : 'Service Account',
+          'GOLDCTL' : 'goldctl',
+        },
+        operatingSystem: 'macos'
+      );
+
+      skiaClient = SkiaGoldClient(
+        workDirectory,
+        fs: fs,
+        process: process,
+        platform: platform,
+        httpClient: mockHttpClient,
+      );
+
+      when(process.run(any))
+        .thenAnswer((_) => Future<ProcessResult>
+        .value(ProcessResult(123, 1, 'fail', 'fail')));
+      final Future<void> test = skiaClient.auth();
+
+      expect(
+        test,
+        throwsException,
+      );
+    });
+
+    test(' throws for error state from init', () {
+      platform = FakePlatform(
+        environment: <String, String>{
+          'FLUTTER_ROOT': _kFlutterRoot,
+          'GOLDCTL' : 'goldctl',
+        },
+        operatingSystem: 'macos'
+      );
+
+      skiaClient = SkiaGoldClient(
+        workDirectory,
+        fs: fs,
+        process: process,
+        platform: platform,
+        httpClient: mockHttpClient,
+      );
+
+      when(process.run(
+        <String>['git', 'rev-parse', 'HEAD'],
+        workingDirectory: '/flutter',
+      )).thenAnswer((_) => Future<ProcessResult>
+        .value(ProcessResult(12345678, 0, '12345678', '')));
+
+      when(process.run(
+        <String>[
+          'goldctl',
+          'imgtest', 'init',
+          '--instance', 'flutter',
+          '--work-dir', '/workDirectory/temp',
+          '--commit', '12345678',
+          '--keys-file', '/workDirectory/keys.json',
+          '--failure-file', '/workDirectory/failures.json',
+          '--passfail',
+        ],
+      )).thenAnswer((_) => Future<ProcessResult>
+        .value(ProcessResult(123, 1, 'fail', 'fail')));
+      final Future<void> test =  skiaClient.imgtestInit();
+
+      expect(
+        test,
+        throwsException,
+      );
     });
 
     group('Request Handling', () {

packages/flutter_goldens_client/lib/skia_client.dart

@@ -128,8 +128,11 @@ class SkiaGoldClient {
     );
 
     if (result.exitCode != 0) {
-      print('goldctl auth stdout: ${result.stdout}');
-      print('goldctl auth stderr: ${result.stderr}');
+      final StringBuffer buf = StringBuffer()
+        ..writeln('Skia Gold auth failed.')
+        ..writeln('stdout: ${result.stdout}')
+        ..writeln('stderr: ${result.stderr}');
+      throw NonZeroExitCode(1, buf.toString());
     }
   }
 
@@ -170,8 +173,11 @@ class SkiaGoldClient {
     );
 
     if (result.exitCode != 0) {
-      print('goldctl imgtest init stdout: ${result.stdout}');
-      print('goldctl imgtest init stderr: ${result.stderr}');
+      final StringBuffer buf = StringBuffer()
+        ..writeln('Skia Gold imgtest init failed.')
+        ..writeln('stdout: ${result.stdout}')
+        ..writeln('stderr: ${result.stderr}');
+      throw NonZeroExitCode(1, buf.toString());
     }
   }