/*
 * Copyright 2017, Google Inc.
 * 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 io.opencensus.common;

import static com.google.common.truth.Truth.assertThat;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

/** Tests for {@link Functions}. */
public class FunctionsTest {
  @Rule public ExpectedException thrown = ExpectedException.none();

  @Test
  public void testReturnNull() {
    assertThat(Functions.returnNull().apply("ignored")).isNull();
  }

  @Test
  public void testReturnConstant() {
    assertThat(Functions.returnConstant(123).apply("ignored")).isEqualTo(123);
  }

  @Test
  public void testThrowIllegalArgumentException() {
    Function<Object, Void> f = Functions.throwIllegalArgumentException();
    thrown.expect(IllegalArgumentException.class);
    f.apply("ignored");
  }
}

@@ -756,16 +756,82 @@
 ception;
+%0Aimport org.junit.runner.RunWith;%0Aimport org.junit.runners.JUnit4;
 %0A%0A/** Te
@@ -860,16 +860,39 @@
 ns%7D. */%0A
+@RunWith(JUnit4.class)%0A
 public c

Fix Functions tests. (#437)