diff --git a/java/google/registry/monitoring/metrics/contrib/AbstractMetricSubject.java b/java/google/registry/monitoring/metrics/contrib/AbstractMetricSubject.java
new file mode 100644
index 000000000..e6a893e40
--- /dev/null
+++ b/java/google/registry/monitoring/metrics/contrib/AbstractMetricSubject.java
@@ -0,0 +1,210 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics.contrib;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Function;
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Ordering;
+import com.google.common.truth.FailureStrategy;
+import com.google.common.truth.Subject;
+import google.registry.monitoring.metrics.Metric;
+import google.registry.monitoring.metrics.MetricPoint;
+import java.util.HashSet;
+import java.util.Set;
+import javax.annotation.Nullable;
+
+/**
+ * Base truth subject for asserting things about {@link Metric} instances.
+ *
+ * <p>For use with the Google <a href="https://google.github.io/truth/">Truth</a> framework.
+ */
+abstract class AbstractMetricSubject<
+        T, M extends Metric<T>, S extends AbstractMetricSubject<T, M, S>>
+    extends Subject<S, M> {
+
+  /** And chainer to allow fluent assertions. */
+  public static class And<S extends AbstractMetricSubject<?, ?, S>> {
+
+    private final S subject;
+
+    And(S subject) {
+      this.subject = subject;
+    }
+
+    public S and() {
+      return subject;
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  And<S> andChainer() {
+    return new And<>((S) this);
+  }
+
+  /** List of label value tuples about which an assertion has been made so far.
+   *
+   * <p>Used to track what tuples have been seen, in order to support hasNoOtherValues() assertions.
+   */
+  protected final Set<ImmutableList<String>> expectedNondefaultLabelTuples = new HashSet<>();
+
+  /**
+   * Function to convert a metric point to a nice string representation for use in error messages.
+   */
+  protected final Function<MetricPoint<T>, String> metricPointConverter =
+      new Function<MetricPoint<T>, String>() {
+        @Override
+        public String apply(MetricPoint<T> metricPoint) {
+          return String.format(
+              "%s => %s",
+              Joiner.on(':').join(metricPoint.labelValues()),
+              getMessageRepresentation(metricPoint.value()));
+        }
+      };
+
+  protected AbstractMetricSubject(FailureStrategy strategy, M actual) {
+    super(strategy, checkNotNull(actual));
+  }
+
+  /**
+   * Returns the string representation of the subject.
+   *
+   * <p>For metrics, it makes sense to use the metric name, as given in the schema.
+   */
+  @Override
+  public String actualCustomStringRepresentation() {
+    return actual().getMetricSchema().name();
+  }
+
+  /**
+   * Asserts that the metric has a given value for the specified label values.
+   *
+   * @param value the value which the metric should have
+   * @param labels the labels for which the value is being asserted; the number and order of labels
+   *     should match the definition of the metric
+   */
+  public And<S> hasValueForLabels(T value, String... labels) {
+    MetricPoint<T> metricPoint = findMetricPointForLabels(ImmutableList.copyOf(labels));
+    if (metricPoint == null) {
+      failWithBadResults(
+          "has a value for labels",
+          Joiner.on(':').join(labels),
+          "has labeled values",
+          Lists.transform(
+              Ordering.<MetricPoint<T>>natural().sortedCopy(actual().getTimestampedValues()),
+              metricPointConverter));
+    }
+    if (!metricPoint.value().equals(value)) {
+      failWithBadResults(
+          String.format("has a value of %s for labels", value),
+          Joiner.on(':').join(labels),
+          "has a value of",
+          getMessageRepresentation(metricPoint.value()));
+    }
+    expectedNondefaultLabelTuples.add(ImmutableList.copyOf(labels));
+    return andChainer();
+  }
+
+  /**
+   * Asserts that the metric has any (non-default) value for the specified label values.
+   *
+   * @param labels the labels for which the value is being asserted; the number and order of labels
+   *     should match the definition of the metric
+   */
+  public And<S> hasAnyValueForLabels(String... labels) {
+    MetricPoint<T> metricPoint = findMetricPointForLabels(ImmutableList.copyOf(labels));
+    if (metricPoint == null) {
+      failWithBadResults(
+          "has a value for labels",
+          Joiner.on(':').join(labels),
+          "has labeled values",
+          Lists.transform(
+              Ordering.<MetricPoint<T>>natural().sortedCopy(actual().getTimestampedValues()),
+              metricPointConverter));
+    }
+    if (hasDefaultValue(metricPoint)) {
+      failWithBadResults(
+          "has a non-default value for labels",
+          Joiner.on(':').join(labels),
+          "has a value of",
+          getMessageRepresentation(metricPoint.value()));
+    }
+    expectedNondefaultLabelTuples.add(ImmutableList.copyOf(labels));
+    return andChainer();
+  }
+
+  /**
+   * Asserts that the metric does not have a (non-default) value for the specified label values.
+   */
+  protected And<S> doesNotHaveAnyValueForLabels(String... labels) {
+    MetricPoint<T> metricPoint = findMetricPointForLabels(ImmutableList.copyOf(labels));
+    if (metricPoint != null) {
+      failWithBadResults(
+          "has no value for labels",
+          Joiner.on(':').join(labels),
+          "has a value of",
+          getMessageRepresentation(metricPoint.value()));
+    }
+    return andChainer();
+  }
+
+  /**
+   * Asserts that the metric has no (non-default) values other than those about which an assertion
+   * has already been made.
+   */
+  public And<S> hasNoOtherValues() {
+    for (MetricPoint<T> metricPoint : actual().getTimestampedValues()) {
+      if (!expectedNondefaultLabelTuples.contains(metricPoint.labelValues())) {
+        if (!hasDefaultValue(metricPoint)) {
+          failWithBadResults(
+              "has",
+              "no other nondefault values",
+              "has labeled values",
+              Lists.transform(
+                  Ordering.<MetricPoint<T>>natural().sortedCopy(actual().getTimestampedValues()),
+                  metricPointConverter));
+        }
+        return andChainer();
+      }
+    }
+    return andChainer();
+  }
+
+  private @Nullable MetricPoint<T> findMetricPointForLabels(ImmutableList<String> labels) {
+    if (actual().getMetricSchema().labels().size() != labels.size()) {
+      return null;
+    }
+    for (MetricPoint<T> metricPoint : actual().getTimestampedValues()) {
+      if (metricPoint.labelValues().equals(labels)) {
+        return metricPoint;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * Returns true if the metric point has a non-default value.
+   *
+   * <p>This should be overridden by subclasses. E.g. for incrementable metrics, the method should
+   * return true if the value is not zero, and so on.
+   */
+  protected abstract boolean hasDefaultValue(MetricPoint<T> metricPoint);
+
+  /** Returns a string representation of a metric point value, for use in error messages. */
+  protected abstract String getMessageRepresentation(T value);
+}
diff --git a/java/google/registry/monitoring/metrics/contrib/BUILD b/java/google/registry/monitoring/metrics/contrib/BUILD
new file mode 100644
index 000000000..e646eaf42
--- /dev/null
+++ b/java/google/registry/monitoring/metrics/contrib/BUILD
@@ -0,0 +1,17 @@
+package(
+    default_testonly = 1,
+    default_visibility = ["//visibility:public"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+java_library(
+    name = "contrib",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/google/registry/monitoring/metrics",
+        "@com_google_code_findbugs_jsr305",
+        "@com_google_guava",
+        "@com_google_truth",
+    ],
+)
diff --git a/java/google/registry/monitoring/metrics/contrib/EventMetricSubject.java b/java/google/registry/monitoring/metrics/contrib/EventMetricSubject.java
new file mode 100644
index 000000000..937ac09e6
--- /dev/null
+++ b/java/google/registry/monitoring/metrics/contrib/EventMetricSubject.java
@@ -0,0 +1,109 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics.contrib;
+
+import static com.google.common.truth.Truth.assertAbout;
+
+import com.google.common.collect.BoundType;
+import com.google.common.collect.Range;
+import com.google.common.truth.FailureStrategy;
+import com.google.common.truth.SubjectFactory;
+import google.registry.monitoring.metrics.Distribution;
+import google.registry.monitoring.metrics.EventMetric;
+import google.registry.monitoring.metrics.MetricPoint;
+import java.util.Map;
+import javax.annotation.Nullable;
+
+/**
+ * Truth subject for the {@link EventMetric} class.
+ *
+ * <p>For use with the Google <a href="https://google.github.io/truth/">Truth</a> framework. Usage:
+ *
+ * <pre>  assertThat(myEventMetric)
+ *       .hasAnyValueForLabels("label1", "label2", "label3")
+ *       .and()
+ *       .hasNoOtherValues();
+ *   assertThat(myEventMetric)
+ *       .doesNotHaveAnyValueForLabels("label1", "label2");
+ * </pre>
+ *
+ * <p>The assertions treat an empty distribution as no value at all. This is not how the data is
+ * actually stored; event metrics do in fact have an empty distribution after they are reset. But
+ * it's difficult to write assertions about expected metric data when any number of empty
+ * distributions can also be present, so they are screened out for convenience.
+ */
+public final class EventMetricSubject
+    extends AbstractMetricSubject<Distribution, EventMetric, EventMetricSubject> {
+
+  /** {@link SubjectFactory} for assertions about {@link EventMetric} objects. */
+  private static final SubjectFactory<EventMetricSubject, EventMetric>
+      SUBJECT_FACTORY =
+          new SubjectFactory<EventMetricSubject, EventMetric>() {
+            // The Truth extensibility documentation indicates that the target should be nullable.
+            @Override
+            public EventMetricSubject getSubject(
+                FailureStrategy failureStrategy, @Nullable EventMetric target) {
+              return new EventMetricSubject(failureStrategy, target);
+            }
+          };
+
+  /** Static assertThat({@link EventMetric}) shortcut method. */
+  public static EventMetricSubject assertThat(@Nullable EventMetric metric) {
+    return assertAbout(SUBJECT_FACTORY).that(metric);
+  }
+
+  private EventMetricSubject(FailureStrategy strategy, EventMetric actual) {
+    super(strategy, actual);
+  }
+
+  /**
+   * Returns an indication to {@link AbstractMetricSubject#hasNoOtherValues} on whether a {@link
+   * MetricPoint} has a non-empty distribution.
+   */
+  @Override
+  protected boolean hasDefaultValue(MetricPoint<Distribution> metricPoint) {
+    return metricPoint.value().count() == 0;
+  }
+
+  /** Returns an appropriate string representation of a metric value for use in error messages. */
+  @Override
+  protected String getMessageRepresentation(Distribution distribution) {
+    StringBuilder sb = new StringBuilder("{");
+    boolean first = true;
+    for (Map.Entry<Range<Double>, Long> entry :
+        distribution.intervalCounts().asMapOfRanges().entrySet()) {
+      if (entry.getValue() != 0L) {
+        if (first) {
+          first = false;
+        } else {
+          sb.append(',');
+        }
+        if (entry.getKey().hasLowerBound()) {
+          sb.append((entry.getKey().lowerBoundType() == BoundType.CLOSED) ? '[' : '(');
+          sb.append(entry.getKey().lowerEndpoint());
+        }
+        sb.append("..");
+        if (entry.getKey().hasUpperBound()) {
+          sb.append(entry.getKey().upperEndpoint());
+          sb.append((entry.getKey().upperBoundType() == BoundType.CLOSED) ? ']' : ')');
+        }
+        sb.append('=');
+        sb.append(entry.getValue());
+      }
+    }
+    sb.append('}');
+    return sb.toString();
+  }
+}
diff --git a/java/google/registry/monitoring/metrics/contrib/IncrementableMetricSubject.java b/java/google/registry/monitoring/metrics/contrib/IncrementableMetricSubject.java
new file mode 100644
index 000000000..aed68d27d
--- /dev/null
+++ b/java/google/registry/monitoring/metrics/contrib/IncrementableMetricSubject.java
@@ -0,0 +1,91 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics.contrib;
+
+import static com.google.common.truth.Truth.assertAbout;
+
+import com.google.common.truth.FailureStrategy;
+import com.google.common.truth.SubjectFactory;
+import google.registry.monitoring.metrics.IncrementableMetric;
+import google.registry.monitoring.metrics.MetricPoint;
+import javax.annotation.Nullable;
+
+/**
+ * Truth subject for the {@link IncrementableMetric} class.
+ *
+ * <p>For use with the Google <a href="https://google.github.io/truth/">Truth</a> framework. Usage:
+ *
+ * <pre>  assertThat(myIncrementableMetric)
+ *       .hasValueForLabels(5, "label1", "label2", "label3")
+ *       .and()
+ *       .hasAnyValueForLabels("label1", "label2", "label4")
+ *       .and()
+ *       .hasNoOtherValues();
+ *   assertThat(myIncrementableMetric)
+ *       .doesNotHaveAnyValueForLabels("label1", "label2");
+ * </pre>
+ *
+ * <p>The assertions treat a value of 0 as no value at all. This is not how the data is actually
+ * stored; zero is a valid value for incrementable metrics, and they do in fact have a value of zero
+ * after they are reset. But it's difficult to write assertions about expected metric data when any
+ * number of zero values can also be present, so they are screened out for convenience.
+ */
+public final class IncrementableMetricSubject
+    extends AbstractMetricSubject<Long, IncrementableMetric, IncrementableMetricSubject> {
+
+  /** {@link SubjectFactory} for assertions about {@link IncrementableMetric} objects. */
+  private static final SubjectFactory<IncrementableMetricSubject, IncrementableMetric>
+      SUBJECT_FACTORY =
+          new SubjectFactory<IncrementableMetricSubject, IncrementableMetric>() {
+            // The Truth extensibility documentation indicates that the target should be nullable.
+            @Override
+            public IncrementableMetricSubject getSubject(
+                FailureStrategy failureStrategy, @Nullable IncrementableMetric target) {
+              return new IncrementableMetricSubject(failureStrategy, target);
+            }
+          };
+
+  /** Static assertThat({@link IncrementableMetric}) shortcut method. */
+  public static IncrementableMetricSubject assertThat(@Nullable IncrementableMetric metric) {
+    return assertAbout(SUBJECT_FACTORY).that(metric);
+  }
+
+  private IncrementableMetricSubject(FailureStrategy strategy, IncrementableMetric actual) {
+    super(strategy, actual);
+  }
+
+  /**
+   * Asserts that the metric has a given value for the specified label values. This is a convenience
+   * method that takes a long instead of a Long, for ease of use.
+   */
+  public And<IncrementableMetricSubject> hasValueForLabels(long value, String... labels) {
+    return hasValueForLabels(Long.valueOf(value), labels);
+  }
+
+  /**
+   * Returns an indication to {@link AbstractMetricSubject#hasNoOtherValues} on whether a {@link
+   * MetricPoint} has a non-zero value.
+   */
+  @Override
+  protected boolean hasDefaultValue(MetricPoint<Long> metricPoint) {
+    return metricPoint.value() == 0L;
+  }
+
+  /** Returns an appropriate string representation of a metric value for use in error messages. */
+  @Override
+  protected String getMessageRepresentation(Long value) {
+    return String.valueOf(value);
+  }
+}
diff --git a/javatests/google/registry/monitoring/metrics/contrib/BUILD b/javatests/google/registry/monitoring/metrics/contrib/BUILD
new file mode 100644
index 000000000..af9bbb1c0
--- /dev/null
+++ b/javatests/google/registry/monitoring/metrics/contrib/BUILD
@@ -0,0 +1,28 @@
+package(
+    default_testonly = 1,
+    default_visibility = ["//java/google/registry:registry_project"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+load("//java/com/google/testing/builddefs:GenTestRules.bzl", "GenTestRules")
+
+java_library(
+    name = "contrib",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/google/registry/monitoring/metrics",
+        "//java/google/registry/monitoring/metrics/contrib",
+        "@com_google_guava",
+        "@com_google_truth",
+        "@junit",
+    ],
+)
+
+GenTestRules(
+    name = "GeneratedTestRules",
+    test_files = glob(["*Test.java"]),
+    deps = [
+        ":contrib",
+    ],
+)
diff --git a/javatests/google/registry/monitoring/metrics/contrib/EventMetricSubjectTest.java b/javatests/google/registry/monitoring/metrics/contrib/EventMetricSubjectTest.java
new file mode 100644
index 000000000..4460c5b61
--- /dev/null
+++ b/javatests/google/registry/monitoring/metrics/contrib/EventMetricSubjectTest.java
@@ -0,0 +1,120 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics.contrib;
+
+import static com.google.common.truth.Truth.assertThat;
+import static google.registry.monitoring.metrics.contrib.EventMetricSubject.assertThat;
+import static org.junit.Assert.fail;
+
+import com.google.common.collect.ImmutableSet;
+import google.registry.monitoring.metrics.EventMetric;
+import google.registry.monitoring.metrics.LabelDescriptor;
+import google.registry.monitoring.metrics.MetricRegistryImpl;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class EventMetricSubjectTest {
+
+  private static final ImmutableSet<LabelDescriptor> LABEL_DESCRIPTORS =
+      ImmutableSet.of(
+          LabelDescriptor.create("species", "Sheep Species"),
+          LabelDescriptor.create("color", "Sheep Color"));
+
+  private static final EventMetric metric =
+      MetricRegistryImpl.getDefault()
+          .newEventMetric(
+              "/test/event/sheep",
+              "Sheep Latency",
+              "sheeplatency",
+              LABEL_DESCRIPTORS,
+              EventMetric.DEFAULT_FITTER);
+
+  @Before
+  public void before() {
+    metric.reset();
+    metric.record(2.5, "Domestic", "Green");
+    metric.record(10, "Bighorn", "Blue");
+  }
+
+  @Test
+  public void testWrongNumberOfLabels_fails() {
+    try {
+      assertThat(metric).hasAnyValueForLabels("Domestic");
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/event/sheep> has a value for labels <Domestic>."
+              + " It has labeled values <[Bighorn:Blue =>"
+              + " {[4.0..16.0)=1}, Domestic:Green => {[1.0..4.0)=1}]>");
+    }
+  }
+
+  @Test
+  public void testDoesNotHaveWrongNumberOfLabels_succeeds() {
+    assertThat(metric).doesNotHaveAnyValueForLabels("Domestic");
+  }
+
+  @Test
+  public void testHasAnyValueForLabels_success() {
+    assertThat(metric)
+        .hasAnyValueForLabels("Domestic", "Green")
+        .and()
+        .hasAnyValueForLabels("Bighorn", "Blue")
+        .and()
+        .hasNoOtherValues();
+  }
+
+  @Test
+  public void testDoesNotHaveValueForLabels_success() {
+    assertThat(metric).doesNotHaveAnyValueForLabels("Domestic", "Blue");
+  }
+
+  @Test
+  public void testDoesNotHaveValueForLabels_failure() {
+    try {
+      assertThat(metric).doesNotHaveAnyValueForLabels("Domestic", "Green");
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/event/sheep> has no value for labels <Domestic:Green>."
+              + " It has a value of <{[1.0..4.0)=1}>");
+    }
+  }
+
+  @Test
+  public void testUnexpectedValue_failure() {
+    try {
+      assertThat(metric)
+          .hasAnyValueForLabels("Domestic", "Green")
+          .and()
+          .hasNoOtherValues();
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/event/sheep> has <no other nondefault values>."
+              + " It has labeled values <[Bighorn:Blue =>"
+              + " {[4.0..16.0)=1}, Domestic:Green => {[1.0..4.0)=1}]>");
+    }
+  }
+}
diff --git a/javatests/google/registry/monitoring/metrics/contrib/IncrementableMetricSubjectTest.java b/javatests/google/registry/monitoring/metrics/contrib/IncrementableMetricSubjectTest.java
new file mode 100644
index 000000000..1098575a1
--- /dev/null
+++ b/javatests/google/registry/monitoring/metrics/contrib/IncrementableMetricSubjectTest.java
@@ -0,0 +1,138 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// 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 google.registry.monitoring.metrics.contrib;
+
+import static com.google.common.truth.Truth.assertThat;
+import static google.registry.monitoring.metrics.contrib.IncrementableMetricSubject.assertThat;
+import static org.junit.Assert.fail;
+
+import com.google.common.collect.ImmutableSet;
+import google.registry.monitoring.metrics.IncrementableMetric;
+import google.registry.monitoring.metrics.LabelDescriptor;
+import google.registry.monitoring.metrics.MetricRegistryImpl;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class IncrementableMetricSubjectTest {
+
+  private static final ImmutableSet<LabelDescriptor> LABEL_DESCRIPTORS =
+      ImmutableSet.of(
+          LabelDescriptor.create("species", "Sheep Species"),
+          LabelDescriptor.create("color", "Sheep Color"));
+
+  private static final IncrementableMetric metric =
+      MetricRegistryImpl.getDefault()
+          .newIncrementableMetric(
+              "/test/incrementable/sheep",
+              "Count of Sheep",
+              "sheepcount",
+              LABEL_DESCRIPTORS);
+
+  @Before
+  public void before() {
+    metric.reset();
+    metric.increment("Domestic", "Green");
+    metric.incrementBy(2, "Bighorn", "Blue");
+  }
+
+  @Test
+  public void testWrongNumberOfLabels_fails() {
+    try {
+      assertThat(metric).hasValueForLabels(1, "Domestic");
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/incrementable/sheep> has a value for labels <Domestic>."
+              + " It has labeled values <[Bighorn:Blue => 2, Domestic:Green => 1]>");
+    }
+  }
+
+  @Test
+  public void testDoesNotHaveWrongNumberOfLabels_succeeds() {
+    assertThat(metric).doesNotHaveAnyValueForLabels("Domestic");
+  }
+
+  @Test
+  public void testHasValueForLabels_success() {
+    assertThat(metric)
+        .hasValueForLabels(1, "Domestic", "Green")
+        .and()
+        .hasValueForLabels(2, "Bighorn", "Blue")
+        .and()
+        .hasNoOtherValues();
+  }
+
+  @Test
+  public void testHasAnyValueForLabels_success() {
+    assertThat(metric)
+        .hasAnyValueForLabels("Domestic", "Green")
+        .and()
+        .hasAnyValueForLabels("Bighorn", "Blue")
+        .and()
+        .hasNoOtherValues();
+  }
+
+  @Test
+  public void testDoesNotHaveValueForLabels_success() {
+    assertThat(metric).doesNotHaveAnyValueForLabels("Domestic", "Blue");
+  }
+
+  @Test
+  public void testDoesNotHaveValueForLabels_failure() {
+    try {
+      assertThat(metric).doesNotHaveAnyValueForLabels("Domestic", "Green");
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/incrementable/sheep> has no value for labels <Domestic:Green>."
+              + " It has a value of <1>");
+    }
+  }
+
+  @Test
+  public void testWrongValue_failure() {
+    try {
+      assertThat(metric).hasValueForLabels(2, "Domestic", "Green");
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/incrementable/sheep> has a value of 2"
+              + " for labels <Domestic:Green>. It has a value of <1>");
+    }
+  }
+
+  @Test
+  public void testUnexpectedValue_failure() {
+    try {
+      assertThat(metric).hasValueForLabels(1, "Domestic", "Green").and().hasNoOtherValues();
+      fail("Expected assertion error");
+    } catch (AssertionError e) {
+      assertThat(e)
+          .hasMessageThat()
+          .isEqualTo(
+              "Not true that </test/incrementable/sheep> has <no other nondefault values>."
+              + " It has labeled values <[Bighorn:Blue => 2, Domestic:Green => 1]>");
+    }
+  }
+}