1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/EventIterableSubject.java b/src/test/java/com/google/devtools/build/lib/testutil/EventIterableSubject.java
new file mode 100644
index 0000000000..534c173f35
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+++ b/src/test/java/com/google/devtools/build/lib/testutil/EventIterableSubject.java
@@ -0,0 +1,37 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// 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.
+package com.google.devtools.build.lib.testutil;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.Iterables;
+import com.google.common.truth.FailureStrategy;
+import com.google.common.truth.IterableSubject;
+import com.google.common.truth.Subject;
+import com.google.devtools.build.lib.events.Event;
+import javax.annotation.Nullable;
+
+/**
+ * {@link Subject} for {@code Iterable<Event>} that provides an {@link IterableSubject} of {@link
+ * String} objects as opposed to the harder-to-assert-on {@link Event} objects.
+ */
+class EventIterableSubject extends Subject<EventIterableSubject, Iterable<Event>> {
+  EventIterableSubject(FailureStrategy failureStrategy, @Nullable Iterable<Event> actual) {
+    super(failureStrategy, actual);
+  }
+
+  IterableSubject hasEventsThat() {
+    return assertThat(Iterables.transform(actual(), Event::getMessage));
+  }
+}