StandardMetadataTimingStatisticTest.java

package org.springframework.roo.metadata.internal;

import static org.junit.Assert.assertEquals;
import static org.springframework.roo.metadata.internal.StandardMetadataTimingStatistic.NANOSECONDS_IN_MILLISECOND;

import org.junit.Test;

/**
 * Unit test of {@link StandardMetadataTimingStatistic}
 * 
 * @author Andrew Swan
 * @since 1.2.0
 */
public class StandardMetadataTimingStatisticTest {

  private static final long INVOCATIONS = 5;

  private static final String NAME = "MyProcess";

  /**
   * Asserts that calling {@link StandardMetadataTimingStatistic#toString()}
   * on an instance with the given duration results in the expected output
   * 
   * @param nanoseconds
   * @param expectedToString
   */
  private void assertToString(final long nanoseconds, final String expectedToString) {
    assertEquals(expectedToString, getTestInstance(nanoseconds).toString());
  }

  /**
   * Creates an instance with fixed test values and the given duration
   * 
   * @param nanoseconds
   * @return a non-<code>null</code> instance
   */
  private StandardMetadataTimingStatistic getTestInstance(final long nanoseconds) {
    return new StandardMetadataTimingStatistic(NAME, nanoseconds, INVOCATIONS);
  }

  @Test
  public void testToStringForLessThanOneMillisecond() {
    assertToString(NANOSECONDS_IN_MILLISECOND - 1, "999999 ns;     5 call(s): MyProcess");
  }

  @Test
  public void testToStringForOneMillisecond() {
    assertToString(NANOSECONDS_IN_MILLISECOND, "     1 ms;     5 call(s): MyProcess");
  }

  @Test
  public void testToStringForTwoMilliseconds() {
    assertToString(NANOSECONDS_IN_MILLISECOND * 2, "     2 ms;     5 call(s): MyProcess");
  }
}