1 files changed, 217 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/common/TimestampTest.java b/api/src/test/java/io/opencensus/common/TimestampTest.java
new file mode 100644
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+++ b/api/src/test/java/io/opencensus/common/TimestampTest.java
@@ -0,0 +1,217 @@
+/*
+ * 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.common;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for {@link Timestamp}. */
+@RunWith(JUnit4.class)
+public class TimestampTest {
+  @Rule public ExpectedException thrown = ExpectedException.none();
+
+  @Test
+  public void timestampCreate() {
+    assertThat(Timestamp.create(24, 42).getSeconds()).isEqualTo(24);
+    assertThat(Timestamp.create(24, 42).getNanos()).isEqualTo(42);
+    assertThat(Timestamp.create(-24, 42).getSeconds()).isEqualTo(-24);
+    assertThat(Timestamp.create(-24, 42).getNanos()).isEqualTo(42);
+    assertThat(Timestamp.create(315576000000L, 999999999).getSeconds()).isEqualTo(315576000000L);
+    assertThat(Timestamp.create(315576000000L, 999999999).getNanos()).isEqualTo(999999999);
+    assertThat(Timestamp.create(-315576000000L, 999999999).getSeconds()).isEqualTo(-315576000000L);
+    assertThat(Timestamp.create(-315576000000L, 999999999).getNanos()).isEqualTo(999999999);
+  }
+
+  @Test
+  public void create_SecondsTooLow() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'seconds' is less than minimum (-315576000000): -315576000001");
+    Timestamp.create(-315576000001L, 0);
+  }
+
+  @Test
+  public void create_SecondsTooHigh() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'seconds' is greater than maximum (315576000000): 315576000001");
+    Timestamp.create(315576000001L, 0);
+  }
+
+  @Test
+  public void create_NanosTooLow_PositiveTime() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'nanos' is less than zero: -1");
+    Timestamp.create(1, -1);
+  }
+
+  @Test
+  public void create_NanosTooHigh_PositiveTime() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'nanos' is greater than maximum (999999999): 1000000000");
+    Timestamp.create(1, 1000000000);
+  }
+
+  @Test
+  public void create_NanosTooLow_NegativeTime() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'nanos' is less than zero: -1");
+    Timestamp.create(-1, -1);
+  }
+
+  @Test
+  public void create_NanosTooHigh_NegativeTime() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'nanos' is greater than maximum (999999999): 1000000000");
+    Timestamp.create(-1, 1000000000);
+  }
+
+  @Test
+  public void timestampFromMillis() {
+    assertThat(Timestamp.fromMillis(0)).isEqualTo(Timestamp.create(0, 0));
+    assertThat(Timestamp.fromMillis(987)).isEqualTo(Timestamp.create(0, 987000000));
+    assertThat(Timestamp.fromMillis(3456)).isEqualTo(Timestamp.create(3, 456000000));
+  }
+
+  @Test
+  public void timestampFromMillis_Negative() {
+    assertThat(Timestamp.fromMillis(-1)).isEqualTo(Timestamp.create(-1, 999000000));
+    assertThat(Timestamp.fromMillis(-999)).isEqualTo(Timestamp.create(-1, 1000000));
+    assertThat(Timestamp.fromMillis(-3456)).isEqualTo(Timestamp.create(-4, 544000000));
+  }
+
+  @Test
+  public void fromMillis_TooLow() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'seconds' is less than minimum (-315576000000): -315576000001");
+    Timestamp.fromMillis(-315576000001000L);
+  }
+
+  @Test
+  public void fromMillis_TooHigh() {
+    thrown.expect(IllegalArgumentException.class);
+    thrown.expectMessage("'seconds' is greater than maximum (315576000000): 315576000001");
+    Timestamp.fromMillis(315576000001000L);
+  }
+
+  @Test
+  public void timestampAddNanos() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.addNanos(0)).isEqualTo(timestamp);
+    assertThat(timestamp.addNanos(999999777)).isEqualTo(Timestamp.create(1235, 0));
+    assertThat(timestamp.addNanos(1300200500)).isEqualTo(Timestamp.create(1235, 300200723));
+    assertThat(timestamp.addNanos(1999999777)).isEqualTo(Timestamp.create(1236, 0));
+    assertThat(timestamp.addNanos(9876543789L)).isEqualTo(Timestamp.create(1243, 876544012));
+    assertThat(timestamp.addNanos(Long.MAX_VALUE))
+        .isEqualTo(Timestamp.create(1234L + 9223372036L, 223 + 854775807));
+  }
+
+  @Test
+  public void timestampAddNanos_Negative() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.addNanos(-223)).isEqualTo(Timestamp.create(1234, 0));
+    assertThat(timestamp.addNanos(-1000000223)).isEqualTo(Timestamp.create(1233, 0));
+    assertThat(timestamp.addNanos(-1300200500)).isEqualTo(Timestamp.create(1232, 699799723));
+    assertThat(timestamp.addNanos(-4123456213L)).isEqualTo(Timestamp.create(1229, 876544010));
+    assertThat(timestamp.addNanos(Long.MIN_VALUE))
+        .isEqualTo(Timestamp.create(1234L - 9223372036L - 1, 223 + 145224192));
+  }
+
+  @Test
+  public void timestampAddDuration() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.addDuration(Duration.create(1, 0))).isEqualTo(Timestamp.create(1235, 223));
+    assertThat(timestamp.addDuration(Duration.create(0, 1))).isEqualTo(Timestamp.create(1234, 224));
+    assertThat(timestamp.addDuration(Duration.create(1, 1))).isEqualTo(Timestamp.create(1235, 224));
+    assertThat(timestamp.addDuration(Duration.create(1, 999999900)))
+        .isEqualTo(Timestamp.create(1236, 123));
+  }
+
+  @Test
+  public void timestampAddDuration_Negative() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.addDuration(Duration.create(-1234, -223)))
+        .isEqualTo(Timestamp.create(0, 0));
+    assertThat(timestamp.addDuration(Duration.create(-1, 0)))
+        .isEqualTo(Timestamp.create(1233, 223));
+    assertThat(timestamp.addDuration(Duration.create(-1, -1)))
+        .isEqualTo(Timestamp.create(1233, 222));
+    assertThat(timestamp.addDuration(Duration.create(-1, -323)))
+        .isEqualTo(Timestamp.create(1232, 999999900));
+    assertThat(timestamp.addDuration(Duration.create(-33, -999999999)))
+        .isEqualTo(Timestamp.create(1200, 224));
+  }
+
+  @Test
+  public void timestampSubtractTimestamp() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(0, 0)))
+        .isEqualTo(Duration.create(1234, 223));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1233, 223)))
+        .isEqualTo(Duration.create(1, 0));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1233, 222)))
+        .isEqualTo(Duration.create(1, 1));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1232, 999999900)))
+        .isEqualTo(Duration.create(1, 323));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1200, 224)))
+        .isEqualTo(Duration.create(33, 999999999));
+  }
+
+  @Test
+  public void timestampSubtractTimestamp_NegativeResult() {
+    Timestamp timestamp = Timestamp.create(1234, 223);
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1235, 223)))
+        .isEqualTo(Duration.create(-1, 0));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1234, 224)))
+        .isEqualTo(Duration.create(0, -1));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1235, 224)))
+        .isEqualTo(Duration.create(-1, -1));
+    assertThat(timestamp.subtractTimestamp(Timestamp.create(1236, 123)))
+        .isEqualTo(Duration.create(-1, -999999900));
+  }
+
+  @Test
+  public void timestamp_CompareTo() {
+    assertThat(Timestamp.create(0, 0).compareTo(Timestamp.create(0, 0))).isEqualTo(0);
+    assertThat(Timestamp.create(24, 42).compareTo(Timestamp.create(24, 42))).isEqualTo(0);
+    assertThat(Timestamp.create(-24, 42).compareTo(Timestamp.create(-24, 42))).isEqualTo(0);
+    assertThat(Timestamp.create(25, 42).compareTo(Timestamp.create(24, 42))).isEqualTo(1);
+    assertThat(Timestamp.create(24, 45).compareTo(Timestamp.create(24, 42))).isEqualTo(1);
+    assertThat(Timestamp.create(24, 42).compareTo(Timestamp.create(25, 42))).isEqualTo(-1);
+    assertThat(Timestamp.create(24, 42).compareTo(Timestamp.create(24, 45))).isEqualTo(-1);
+    assertThat(Timestamp.create(-25, 42).compareTo(Timestamp.create(-24, 42))).isEqualTo(-1);
+    assertThat(Timestamp.create(-24, 45).compareTo(Timestamp.create(-24, 42))).isEqualTo(1);
+    assertThat(Timestamp.create(-24, 42).compareTo(Timestamp.create(-25, 42))).isEqualTo(1);
+    assertThat(Timestamp.create(-24, 42).compareTo(Timestamp.create(-24, 45))).isEqualTo(-1);
+  }
+
+  @Test
+  public void timestamp_Equal() {
+    // Positive tests.
+    assertThat(Timestamp.create(0, 0)).isEqualTo(Timestamp.create(0, 0));
+    assertThat(Timestamp.create(24, 42)).isEqualTo(Timestamp.create(24, 42));
+    assertThat(Timestamp.create(-24, 42)).isEqualTo(Timestamp.create(-24, 42));
+    // Negative tests.
+    assertThat(Timestamp.create(25, 42)).isNotEqualTo(Timestamp.create(24, 42));
+    assertThat(Timestamp.create(24, 43)).isNotEqualTo(Timestamp.create(24, 42));
+    assertThat(Timestamp.create(-25, 42)).isNotEqualTo(Timestamp.create(-24, 42));
+    assertThat(Timestamp.create(-24, 43)).isNotEqualTo(Timestamp.create(-24, 42));
+  }
+}