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diff --git a/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextBinarySerializerImplTest.java b/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextBinarySerializerImplTest.java
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+++ b/impl_core/src/test/java/io/opencensus/implcore/tags/propagation/TagContextBinarySerializerImplTest.java
@@ -0,0 +1,94 @@
+/*
+ * 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.propagation;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableSet;
+import io.opencensus.implcore.tags.TagsComponentImplBase;
+import io.opencensus.implcore.tags.TagsTestUtil;
+import io.opencensus.tags.Tag;
+import io.opencensus.tags.TagContext;
+import io.opencensus.tags.TagKey;
+import io.opencensus.tags.TagValue;
+import io.opencensus.tags.TaggingState;
+import io.opencensus.tags.TagsComponent;
+import io.opencensus.tags.propagation.TagContextBinarySerializer;
+import io.opencensus.tags.propagation.TagContextDeserializationException;
+import io.opencensus.tags.propagation.TagContextSerializationException;
+import java.util.Iterator;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * Tests for {@link TagContextBinarySerializerImpl}.
+ *
+ * <p>Thorough serialization/deserialization tests are in {@link TagContextSerializationTest},
+ * {@link TagContextDeserializationTest}, and {@link TagContextRoundtripTest}.
+ */
+@RunWith(JUnit4.class)
+public final class TagContextBinarySerializerImplTest {
+  private final TagsComponent tagsComponent = new TagsComponentImplBase();
+  private final TagContextBinarySerializer serializer =
+      tagsComponent.getTagPropagationComponent().getBinarySerializer();
+
+  private final TagContext tagContext =
+      new TagContext() {
+        @Override
+        public Iterator<Tag> getIterator() {
+          return ImmutableSet.<Tag>of(Tag.create(TagKey.create("key"), TagValue.create("value")))
+              .iterator();
+        }
+      };
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void toByteArray_TaggingDisabled() throws TagContextSerializationException {
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(serializer.toByteArray(tagContext)).isEmpty();
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void toByteArray_TaggingReenabled() throws TagContextSerializationException {
+    final byte[] serialized = serializer.toByteArray(tagContext);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(serializer.toByteArray(tagContext)).isEmpty();
+    tagsComponent.setState(TaggingState.ENABLED);
+    assertThat(serializer.toByteArray(tagContext)).isEqualTo(serialized);
+  }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void fromByteArray_TaggingDisabled()
+      throws TagContextDeserializationException, TagContextSerializationException {
+    byte[] serialized = serializer.toByteArray(tagContext);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(TagsTestUtil.tagContextToList(serializer.fromByteArray(serialized))).isEmpty();
+  }
+
+  @Test
+  public void fromByteArray_TaggingReenabled()
+      throws TagContextDeserializationException, TagContextSerializationException {
+    byte[] serialized = serializer.toByteArray(tagContext);
+    tagsComponent.setState(TaggingState.DISABLED);
+    assertThat(TagsTestUtil.tagContextToList(serializer.fromByteArray(serialized))).isEmpty();
+    tagsComponent.setState(TaggingState.ENABLED);
+    assertThat(serializer.fromByteArray(serialized)).isEqualTo(tagContext);
+  }
+}