1 files changed, 51 insertions, 0 deletions
diff --git a/impl_core/src/test/java/io/opencensus/implcore/internal/TimestampConverterTest.java b/impl_core/src/test/java/io/opencensus/implcore/internal/TimestampConverterTest.java
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index 00000000..32a3e687
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+++ b/impl_core/src/test/java/io/opencensus/implcore/internal/TimestampConverterTest.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2017, OpenCensus Authors
+ *
+ * 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.implcore.internal;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
+
+import io.opencensus.common.Clock;
+import io.opencensus.common.Timestamp;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+/** Unit tests for {@link TimestampConverter}. */
+@RunWith(JUnit4.class)
+public class TimestampConverterTest {
+  private final Timestamp timestamp = Timestamp.create(1234, 5678);
+  @Mock private Clock mockClock;
+
+  @Before
+  public void setUp() {
+    MockitoAnnotations.initMocks(this);
+  }
+
+  @Test
+  public void convertNanoTime() {
+    when(mockClock.now()).thenReturn(timestamp);
+    when(mockClock.nowNanos()).thenReturn(1234L);
+    TimestampConverter timeConverter = TimestampConverter.now(mockClock);
+    assertThat(timeConverter.convertNanoTime(6234)).isEqualTo(Timestamp.create(1234, 10678));
+    assertThat(timeConverter.convertNanoTime(1000)).isEqualTo(Timestamp.create(1234, 5444));
+    assertThat(timeConverter.convertNanoTime(999995556)).isEqualTo(Timestamp.create(1235, 0));
+  }
+}