Revert "Revert "Move TimeBudget to vespajlib and use Clock""

1 files changed, 40 insertions, 0 deletions

diff --git a/vespajlib/src/test/java/com/yahoo/time/TimeBudgetTestCase.java b/vespajlib/src/test/java/com/yahoo/time/TimeBudgetTestCase.java
new file mode 100644
index 00000000000..ddd57c71a0d
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/time/TimeBudgetTestCase.java
@@ -0,0 +1,40 @@
+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.time;
+
+import com.google.common.util.concurrent.UncheckedTimeoutException;
+import com.yahoo.test.ManualClock;
+import org.junit.Test;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+import static org.mockito.Mockito.mock;
+
+public class TimeBudgetTestCase {
+    private final Clock clock = mock(Clock.class);
+
+    @Test
+    public void testBasics() {
+        ManualClock clock = new ManualClock();
+        clock.setInstant(Instant.ofEpochSecond(0));
+        TimeBudget timeBudget = TimeBudget.fromNow(clock, Duration.ofSeconds(10));
+
+        clock.advance(Duration.ofSeconds(7));
+        assertEquals(Duration.ofSeconds(3), timeBudget.timeLeftOrThrow());
+
+        // Verify that toMillis() of >=1 is fine, but 0 is not.
+
+        clock.setInstant(Instant.ofEpochSecond(9, 999000000));
+        assertEquals(1, timeBudget.timeLeftOrThrow().toMillis());
+        clock.setInstant(Instant.ofEpochSecond(9, 999000001));
+        try {
+            timeBudget.timeLeftOrThrow();
+            fail();
+        } catch (UncheckedTimeoutException e) {
+            // OK
+        }
+    }
+}
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