Move gerrit testutil to gerrit/testing package

Change-Id: I2e0c024ce21f5c0747f0e3f243067493f182a135

java/com/google/gerrit/testing/TestTimeUtil.java

@@ -0,0 +1,93 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.gerrit.testing;
+
+import static com.google.common.base.Preconditions.checkState;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import com.google.gerrit.common.TimeUtil;
+import java.sql.Timestamp;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.Month;
+import java.time.ZoneOffset;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+
+/** Static utility methods for dealing with dates and times in tests. */
+public class TestTimeUtil {
+  public static final Instant START =
+      LocalDateTime.of(2009, Month.SEPTEMBER, 30, 17, 0, 0)
+          .atOffset(ZoneOffset.ofHours(-4))
+          .toInstant();
+
+  private static Long clockStepMs;
+  private static AtomicLong clockMs;
+
+  /**
+   * Reset the clock to a known start point, then set the clock step.
+   *
+   * <p>The clock is initially set to 2009/09/30 17:00:00 -0400.
+   *
+   * @param clockStep amount to increment clock by on each lookup.
+   * @param clockStepUnit time unit for {@code clockStep}.
+   */
+  public static synchronized void resetWithClockStep(long clockStep, TimeUnit clockStepUnit) {
+    // Set an arbitrary start point so tests are more repeatable.
+    clockMs = new AtomicLong(START.toEpochMilli());
+    setClockStep(clockStep, clockStepUnit);
+  }
+
+  /**
+   * Set the clock step used by {@link com.google.gerrit.common.TimeUtil}.
+   *
+   * @param clockStep amount to increment clock by on each lookup.
+   * @param clockStepUnit time unit for {@code clockStep}.
+   */
+  public static synchronized void setClockStep(long clockStep, TimeUnit clockStepUnit) {
+    checkState(clockMs != null, "call resetWithClockStep first");
+    clockStepMs = MILLISECONDS.convert(clockStep, clockStepUnit);
+    TimeUtil.setCurrentMillisSupplier(() -> clockMs.getAndAdd(clockStepMs));
+  }
+
+  /**
+   * Set the clock to a specific timestamp.
+   *
+   * @param ts time to set
+   */
+  public static synchronized void setClock(Timestamp ts) {
+    checkState(clockMs != null, "call resetWithClockStep first");
+    clockMs.set(ts.getTime());
+  }
+
+  /**
+   * Increment the clock once by a given amount.
+   *
+   * @param clockStep amount to increment clock by.
+   * @param clockStepUnit time unit for {@code clockStep}.
+   */
+  public static synchronized void incrementClock(long clockStep, TimeUnit clockStepUnit) {
+    checkState(clockMs != null, "call resetWithClockStep first");
+    clockMs.addAndGet(clockStepUnit.toMillis(clockStep));
+  }
+
+  /** Reset the clock to use the actual system clock. */
+  public static synchronized void useSystemTime() {
+    clockMs = null;
+    TimeUtil.resetCurrentMillisSupplier();
+  }
+
+  private TestTimeUtil() {}
+}