package com.codahale.metrics.health;
import org.junit.Before;
import org.junit.Test;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import static org.assertj.core.api.Assertions.*;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
public class HealthCheckRegistryTest {
private final HealthCheckRegistry registry = new HealthCheckRegistry();
private final HealthCheck hc1 = mock(HealthCheck.class);
private final HealthCheck hc2 = mock(HealthCheck.class);
private final HealthCheck.Result r1 = mock(HealthCheck.Result.class);
private final HealthCheck.Result r2 = mock(HealthCheck.Result.class);
@Before
public void setUp() throws Exception {
when(hc1.execute()).thenReturn(r1);
when(hc2.execute()).thenReturn(r2);
registry.register("hc1", hc1);
registry.register("hc2", hc2);
}
@Test
public void runsRegisteredHealthChecks() throws Exception {
final Map<String, HealthCheck.Result> results = registry.runHealthChecks();
assertThat(results)
.contains(entry("hc1", r1));
assertThat(results)
.contains(entry("hc2", r2));
}
@Test
public void runsRegisteredHealthChecksInParallel() throws Exception {
final ExecutorService executor = Executors.newFixedThreadPool(10);
final Map<String, HealthCheck.Result> results = registry.runHealthChecks(executor);
executor.shutdown();
executor.awaitTermination(1, TimeUnit.SECONDS);
assertThat(results)
.contains(entry("hc1", r1));
assertThat(results)
.contains(entry("hc2", r2));
}
@Test
public void removesRegisteredHealthChecks() throws Exception {
registry.unregister("hc1");
final Map<String, HealthCheck.Result> results = registry.runHealthChecks();
assertThat(results)
.doesNotContainKey("hc1");
assertThat(results)
.containsKey("hc2");
}
@Test
public void hasASetOfHealthCheckNames() throws Exception {
assertThat(registry.getNames())
.containsOnly("hc1", "hc2");
}
@Test
public void runsHealthChecksByName() throws Exception {
assertThat(registry.runHealthCheck("hc1"))
.isEqualTo(r1);
}
@Test
public void doesNotRunNonexistentHealthChecks() throws Exception {
try {
registry.runHealthCheck("what");
failBecauseExceptionWasNotThrown(NoSuchElementException.class);
} catch (NoSuchElementException e) {
assertThat(e.getMessage())
.isEqualTo("No health check named what exists");
}
}
}