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diff --git a/impl_core/src/test/java/io/opencensus/implcore/tags/TaggerImplTest.java b/impl_core/src/test/java/io/opencensus/implcore/tags/TaggerImplTest.java
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+++ b/impl_core/src/test/java/io/opencensus/implcore/tags/TaggerImplTest.java
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+/*
+ * Copyright 2017, OpenCensus Authors
+ *
+ * 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 io.opencensus.implcore.tags;
+
+import static com.google.common.truth.Truth.assertThat;
+import static io.opencensus.implcore.tags.TagsTestUtil.tagContextToList;
+
+import com.google.common.collect.Lists;
+import io.grpc.Context;
+import io.opencensus.common.Scope;
+import io.opencensus.implcore.internal.NoopScope;
+import io.opencensus.tags.Tag;
+import io.opencensus.tags.TagContext;
+import io.opencensus.tags.TagContextBuilder;
+import io.opencensus.tags.TagKey;
+import io.opencensus.tags.TagValue;
+import io.opencensus.tags.Tagger;
+import io.opencensus.tags.TaggingState;
+import io.opencensus.tags.TagsComponent;
+import io.opencensus.tags.unsafe.ContextUtils;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link TaggerImpl}. */
+@RunWith(JUnit4.class)
+public class TaggerImplTest {
+  private final TagsComponent tagsComponent = new TagsComponentImplBase();
+  private final Tagger tagger = tagsComponent.getTagger();
+
+  private static final TagKey K1 = TagKey.create("k1");
+  private static final TagKey K2 = TagKey.create("k2");
+  private static final TagKey K3 = TagKey.create("k3");
+
+  private static final TagValue V1 = TagValue.create("v1");
+  private static final TagValue V2 = TagValue.create("v2");
+  private static final TagValue V3 = TagValue.create("v3");
+
+  private static final Tag TAG1 = Tag.create(K1, V1);
+  private static final Tag TAG2 = Tag.create(K2, V2);
+  private static final Tag TAG3 = Tag.create(K3, V3);
+
+  @Test
+  public void empty() {
+    assertThat(tagContextToList(tagger.empty())).isEmpty();
+    assertThat(tagger.empty()).isInstanceOf(TagContextImpl.class);
+  }
+
+  @Test
+  public void empty_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagContextToList(tagger.empty())).isEmpty();
+    assertThat(tagger.empty()).isInstanceOf(TagContextImpl.class);
+  }
+
+  @Test
+  public void emptyBuilder() {
+    TagContextBuilder builder = tagger.emptyBuilder();
+    assertThat(builder).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(builder.build())).isEmpty();
+  }
+
+  @Test
+  public void emptyBuilder_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagger.emptyBuilder()).isSameAs(NoopTagContextBuilder.INSTANCE);
+  }
+
+  @Test
+  public void emptyBuilder_TaggingReenabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagger.emptyBuilder()).isSameAs(NoopTagContextBuilder.INSTANCE);
+    tagsComponent.setState(TaggingState.ENABLED);
+    TagContextBuilder builder = tagger.emptyBuilder();
+    assertThat(builder).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(builder.put(K1, V1).build())).containsExactly(Tag.create(K1, V1));
+  }
+
+  @Test
+  public void currentBuilder() {
+    TagContext tags = new SimpleTagContext(TAG1, TAG2, TAG3);
+    TagContextBuilder result = getResultOfCurrentBuilder(tags);
+    assertThat(result).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(result.build())).containsExactly(TAG1, TAG2, TAG3);
+  }
+
+  @Test
+  public void currentBuilder_DefaultIsEmpty() {
+    TagContextBuilder currentBuilder = tagger.currentBuilder();
+    assertThat(currentBuilder).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(currentBuilder.build())).isEmpty();
+  }
+
+  @Test
+  public void currentBuilder_RemoveDuplicateTags() {
+    Tag tag1 = Tag.create(K1, V1);
+    Tag tag2 = Tag.create(K1, V2);
+    TagContext tagContextWithDuplicateTags = new SimpleTagContext(tag1, tag2);
+    TagContextBuilder result = getResultOfCurrentBuilder(tagContextWithDuplicateTags);
+    assertThat(tagContextToList(result.build())).containsExactly(tag2);
+  }
+
+  @Test
+  public void currentBuilder_SkipNullTag() {
+    TagContext tagContextWithNullTag = new SimpleTagContext(TAG1, null, TAG2);
+    TagContextBuilder result = getResultOfCurrentBuilder(tagContextWithNullTag);
+    assertThat(tagContextToList(result.build())).containsExactly(TAG1, TAG2);
+  }
+
+  @Test
+  public void currentBuilder_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(getResultOfCurrentBuilder(new SimpleTagContext(TAG1)))
+        .isSameAs(NoopTagContextBuilder.INSTANCE);
+  }
+
+  @Test
+  public void currentBuilder_TaggingReenabled() {
+    TagContext tags = new SimpleTagContext(TAG1);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(getResultOfCurrentBuilder(tags)).isSameAs(NoopTagContextBuilder.INSTANCE);
+    tagsComponent.setState(TaggingState.ENABLED);
+    TagContextBuilder builder = getResultOfCurrentBuilder(tags);
+    assertThat(builder).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(builder.build())).containsExactly(TAG1);
+  }
+
+  private TagContextBuilder getResultOfCurrentBuilder(TagContext tagsToSet) {
+    Context orig = Context.current().withValue(ContextUtils.TAG_CONTEXT_KEY, tagsToSet).attach();
+    try {
+      return tagger.currentBuilder();
+    } finally {
+      Context.current().detach(orig);
+    }
+  }
+
+  @Test
+  public void toBuilder_ConvertUnknownTagContextToTagContextImpl() {
+    TagContext unknownTagContext = new SimpleTagContext(TAG1, TAG2, TAG3);
+    TagContext newTagContext = tagger.toBuilder(unknownTagContext).build();
+    assertThat(tagContextToList(newTagContext)).containsExactly(TAG1, TAG2, TAG3);
+    assertThat(newTagContext).isInstanceOf(TagContextImpl.class);
+  }
+
+  @Test
+  public void toBuilder_RemoveDuplicatesFromUnknownTagContext() {
+    Tag tag1 = Tag.create(K1, V1);
+    Tag tag2 = Tag.create(K1, V2);
+    TagContext tagContextWithDuplicateTags = new SimpleTagContext(tag1, tag2);
+    TagContext newTagContext = tagger.toBuilder(tagContextWithDuplicateTags).build();
+    assertThat(tagContextToList(newTagContext)).containsExactly(tag2);
+  }
+
+  @Test
+  public void toBuilder_SkipNullTag() {
+    TagContext tagContextWithNullTag = new SimpleTagContext(TAG1, null, TAG2);
+    TagContext newTagContext = tagger.toBuilder(tagContextWithNullTag).build();
+    assertThat(tagContextToList(newTagContext)).containsExactly(TAG1, TAG2);
+  }
+
+  @Test
+  public void toBuilder_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagger.toBuilder(new SimpleTagContext(TAG1)))
+        .isSameAs(NoopTagContextBuilder.INSTANCE);
+  }
+
+  @Test
+  public void toBuilder_TaggingReenabled() {
+    TagContext tags = new SimpleTagContext(TAG1);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagger.toBuilder(tags)).isSameAs(NoopTagContextBuilder.INSTANCE);
+    tagsComponent.setState(TaggingState.ENABLED);
+    TagContextBuilder builder = tagger.toBuilder(tags);
+    assertThat(builder).isInstanceOf(TagContextBuilderImpl.class);
+    assertThat(tagContextToList(builder.build())).containsExactly(TAG1);
+  }
+
+  @Test
+  public void getCurrentTagContext_DefaultIsEmptyTagContextImpl() {
+    TagContext currentTagContext = tagger.getCurrentTagContext();
+    assertThat(tagContextToList(currentTagContext)).isEmpty();
+    assertThat(currentTagContext).isInstanceOf(TagContextImpl.class);
+  }
+
+  @Test
+  public void getCurrentTagContext_ConvertUnknownTagContextToTagContextImpl() {
+    TagContext unknownTagContext = new SimpleTagContext(TAG1, TAG2, TAG3);
+    TagContext result = getResultOfGetCurrentTagContext(unknownTagContext);
+    assertThat(result).isInstanceOf(TagContextImpl.class);
+    assertThat(tagContextToList(result)).containsExactly(TAG1, TAG2, TAG3);
+  }
+
+  @Test
+  public void getCurrentTagContext_RemoveDuplicatesFromUnknownTagContext() {
+    Tag tag1 = Tag.create(K1, V1);
+    Tag tag2 = Tag.create(K1, V2);
+    TagContext tagContextWithDuplicateTags = new SimpleTagContext(tag1, tag2);
+    TagContext result = getResultOfGetCurrentTagContext(tagContextWithDuplicateTags);
+    assertThat(tagContextToList(result)).containsExactly(tag2);
+  }
+
+  @Test
+  public void getCurrentTagContext_SkipNullTag() {
+    TagContext tagContextWithNullTag = new SimpleTagContext(TAG1, null, TAG2);
+    TagContext result = getResultOfGetCurrentTagContext(tagContextWithNullTag);
+    assertThat(tagContextToList(result)).containsExactly(TAG1, TAG2);
+  }
+
+  @Test
+  public void getCurrentTagContext_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagContextToList(getResultOfGetCurrentTagContext(new SimpleTagContext(TAG1))))
+        .isEmpty();
+  }
+
+  @Test
+  public void getCurrentTagContext_TaggingReenabled() {
+    TagContext tags = new SimpleTagContext(TAG1);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagContextToList(getResultOfGetCurrentTagContext(tags))).isEmpty();
+    tagsComponent.setState(TaggingState.ENABLED);
+    assertThat(tagContextToList(getResultOfGetCurrentTagContext(tags))).containsExactly(TAG1);
+  }
+
+  private TagContext getResultOfGetCurrentTagContext(TagContext tagsToSet) {
+    Context orig = Context.current().withValue(ContextUtils.TAG_CONTEXT_KEY, tagsToSet).attach();
+    try {
+      return tagger.getCurrentTagContext();
+    } finally {
+      Context.current().detach(orig);
+    }
+  }
+
+  @Test
+  public void withTagContext_ConvertUnknownTagContextToTagContextImpl() {
+    TagContext unknownTagContext = new SimpleTagContext(TAG1, TAG2, TAG3);
+    TagContext result = getResultOfWithTagContext(unknownTagContext);
+    assertThat(result).isInstanceOf(TagContextImpl.class);
+    assertThat(tagContextToList(result)).containsExactly(TAG1, TAG2, TAG3);
+  }
+
+  @Test
+  public void withTagContext_RemoveDuplicatesFromUnknownTagContext() {
+    Tag tag1 = Tag.create(K1, V1);
+    Tag tag2 = Tag.create(K1, V2);
+    TagContext tagContextWithDuplicateTags = new SimpleTagContext(tag1, tag2);
+    TagContext result = getResultOfWithTagContext(tagContextWithDuplicateTags);
+    assertThat(tagContextToList(result)).containsExactly(tag2);
+  }
+
+  @Test
+  public void withTagContext_SkipNullTag() {
+    TagContext tagContextWithNullTag = new SimpleTagContext(TAG1, null, TAG2);
+    TagContext result = getResultOfWithTagContext(tagContextWithNullTag);
+    assertThat(tagContextToList(result)).containsExactly(TAG1, TAG2);
+  }
+
+  @Test
+  public void withTagContext_ReturnsNoopScopeWhenTaggingIsDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagger.withTagContext(new SimpleTagContext(TAG1))).isSameAs(NoopScope.getInstance());
+  }
+
+  @Test
+  public void withTagContext_TaggingDisabled() {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagContextToList(getResultOfWithTagContext(new SimpleTagContext(TAG1)))).isEmpty();
+  }
+
+  @Test
+  public void withTagContext_TaggingReenabled() {
+    TagContext tags = new SimpleTagContext(TAG1);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(tagContextToList(getResultOfWithTagContext(tags))).isEmpty();
+    tagsComponent.setState(TaggingState.ENABLED);
+    assertThat(tagContextToList(getResultOfWithTagContext(tags))).containsExactly(TAG1);
+  }
+
+  private TagContext getResultOfWithTagContext(TagContext tagsToSet) {
+    Scope scope = tagger.withTagContext(tagsToSet);
+    try {
+      return ContextUtils.TAG_CONTEXT_KEY.get();
+    } finally {
+      scope.close();
+    }
+  }
+
+  private static final class SimpleTagContext extends TagContext {
+    private final List<Tag> tags;
+
+    SimpleTagContext(Tag... tags) {
+      this.tags = Collections.unmodifiableList(Lists.newArrayList(tags));
+    }
+
+    @Override
+    protected Iterator<Tag> getIterator() {
+      return tags.iterator();
+    }
+  }
+}