diff --git a/xds/src/test/java/io/grpc/xds/BootstrapperTest.java b/xds/src/test/java/io/grpc/xds/BootstrapperTest.java
new file mode 100644
index 0000000000..8306b68dcb
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+++ b/xds/src/test/java/io/grpc/xds/BootstrapperTest.java
@@ -0,0 +1,219 @@
+/*
+ * Copyright 2019 The gRPC 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.grpc.xds;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.fail;
+
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import io.envoyproxy.envoy.api.v2.core.ApiConfigSource;
+import io.envoyproxy.envoy.api.v2.core.ApiConfigSource.ApiType;
+import io.envoyproxy.envoy.api.v2.core.GrpcService;
+import io.envoyproxy.envoy.api.v2.core.GrpcService.GoogleGrpc;
+import io.envoyproxy.envoy.api.v2.core.Locality;
+import io.envoyproxy.envoy.api.v2.core.Node;
+import io.grpc.xds.Bootstrapper.FileBasedBootstrapper;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for {@link Bootstrapper}. */
+@RunWith(JUnit4.class)
+public class BootstrapperTest {
+
+  @Test
+  public void validBootstrap() {
+    Bootstrap config =
+        Bootstrap.newBuilder()
+            .setNode(
+                Node.newBuilder()
+                    .setId("ENVOY_NODE_ID")
+                    .setLocality(
+                        Locality.newBuilder().setZone("ENVOY_ZONE").setRegion("ENVOY_REGION"))
+                    .setMetadata(
+                        Struct.newBuilder()
+                            .putFields("TRAFFICDIRECTOR_INTERCEPTION_PORT",
+                                Value.newBuilder().setStringValue("ENVOY_PORT").build())
+                            .putFields("TRAFFICDIRECTOR_NETWORK_NAME",
+                                Value.newBuilder().setStringValue("VPC_NETWORK_NAME").build())))
+            .setXdsServer(ApiConfigSource.newBuilder()
+                .setApiType(ApiType.GRPC)
+                .addGrpcServices(
+                    GrpcService.newBuilder()
+                        .setGoogleGrpc(
+                            GoogleGrpc.newBuilder()
+                                .setTargetUri("trafficdirector.googleapis.com:443").build())))
+            .build();
+
+    Bootstrapper bootstrapper = new FileBasedBootstrapper(config);
+    assertThat(bootstrapper.getBalancerName()).isEqualTo("trafficdirector.googleapis.com:443");
+    assertThat(bootstrapper.getNode())
+        .isEqualTo(
+            Node.newBuilder()
+                .setId("ENVOY_NODE_ID")
+                .setLocality(Locality.newBuilder().setZone("ENVOY_ZONE").setRegion("ENVOY_REGION"))
+                .setMetadata(
+                    Struct.newBuilder()
+                        .putFields("TRAFFICDIRECTOR_INTERCEPTION_PORT",
+                            Value.newBuilder().setStringValue("ENVOY_PORT").build())
+                        .putFields("TRAFFICDIRECTOR_NETWORK_NAME",
+                            Value.newBuilder().setStringValue("VPC_NETWORK_NAME").build())
+                        .build()).build());
+  }
+
+  @Test
+  public void unsupportedApiType() {
+    Bootstrap config =
+        Bootstrap.newBuilder()
+            .setNode(
+                Node.newBuilder()
+                    .setId("ENVOY_NODE_ID")
+                    .setLocality(
+                        Locality.newBuilder().setZone("ENVOY_ZONE").setRegion("ENVOY_REGION"))
+                    .setMetadata(
+                        Struct.newBuilder()
+                            .putFields("TRAFFICDIRECTOR_INTERCEPTION_PORT",
+                                Value.newBuilder().setStringValue("ENVOY_PORT").build())
+                            .putFields("TRAFFICDIRECTOR_NETWORK_NAME",
+                                Value.newBuilder().setStringValue("VPC_NETWORK_NAME").build())))
+            .setXdsServer(ApiConfigSource.newBuilder()
+                .setApiType(ApiType.REST)
+                .addGrpcServices(
+                    GrpcService.newBuilder()
+                        .setGoogleGrpc(
+                            GoogleGrpc.newBuilder()
+                                .setTargetUri("trafficdirector.googleapis.com:443").build())))
+            .build();
+
+    try {
+      new FileBasedBootstrapper(config);
+      fail("RuntimeException should have been thrown");
+    } catch (RuntimeException e) {
+      // Expected.
+      assertThat(e.getMessage()).isEqualTo("Unexpected api type: REST");
+    }
+  }
+
+  @Test
+  public void tooManyGrpcServices() {
+    Bootstrap config =
+        Bootstrap.newBuilder()
+            .setNode(
+                Node.newBuilder()
+                    .setId("ENVOY_NODE_ID")
+                    .setLocality(
+                        Locality.newBuilder().setZone("ENVOY_ZONE").setRegion("ENVOY_REGION"))
+                    .setMetadata(
+                        Struct.newBuilder()
+                            .putFields("TRAFFICDIRECTOR_INTERCEPTION_PORT",
+                                Value.newBuilder().setStringValue("ENVOY_PORT").build())
+                            .putFields("TRAFFICDIRECTOR_NETWORK_NAME",
+                                Value.newBuilder().setStringValue("VPC_NETWORK_NAME").build())))
+            .setXdsServer(ApiConfigSource.newBuilder()
+                .setApiType(ApiType.GRPC)
+                .addGrpcServices(
+                    GrpcService.newBuilder()
+                        .setGoogleGrpc(
+                            GoogleGrpc.newBuilder()
+                                .setTargetUri("trafficdirector.googleapis.com:443").build()))
+                .addGrpcServices(
+                    GrpcService.newBuilder()
+                        .setGoogleGrpc(
+                            GoogleGrpc.newBuilder()
+                                .setTargetUri("foobar.googleapis.com:443").build()))
+                )
+            .build();
+
+    try {
+      new FileBasedBootstrapper(config);
+      fail("RuntimeException should have been thrown");
+    } catch (RuntimeException e) {
+      // Expected.
+      assertThat(e.getMessage())
+          .isEqualTo("Unexpected number of gRPC services: expected: 1, actual: 2");
+    }
+  }
+
+  @Test
+  public void parseBootstrap_emptyData() {
+    String rawData = "";
+    try {
+      Bootstrapper.parseConfig(rawData);
+      fail("InvalidProtocolBufferException should have been thrown");
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+  }
+
+  @Test
+  public void parseBootstrap_invalidNodeProto() {
+    String rawData = "{"
+        + "\"node\": {"
+        + "\"id\": \"ENVOY_NODE_ID\","
+        + "\"bad_field\": \"bad_value\""
+        + "\"locality\": {"
+        + "\"zone\": \"ENVOY_ZONE\"},"
+        + "\"metadata\": {"
+        + "\"TRAFFICDIRECTOR_INTERCEPTION_PORT\": \"ENVOY_PORT\", "
+        + "\"TRAFFICDIRECTOR_NETWORK_NAME\": \"VPC_NETWORK_NAME\""
+        + "}"
+        + "},"
+        + "\"xds_server\": {"
+        + "\"api_type\": \"GRPC\","
+        + "\"grpc_services\": "
+        + "[ {\"google_grpc\": {\"target_uri\": \"trafficdirector.googleapis.com:443\"} } ]"
+        + "} "
+        + "}";
+
+    try {
+      Bootstrapper.parseConfig(rawData);
+      fail("InvalidProtocolBufferException should have been thrown");
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+  }
+
+  @Test
+  public void parseBootstrap_invalidApiConfigSourceProto() {
+    String rawData = "{"
+        + "\"node\": {"
+        + "\"id\": \"ENVOY_NODE_ID\","
+        + "\"locality\": {"
+        + "\"zone\": \"ENVOY_ZONE\"},"
+        + "\"metadata\": {"
+        + "\"TRAFFICDIRECTOR_INTERCEPTION_PORT\": \"ENVOY_PORT\", "
+        + "\"TRAFFICDIRECTOR_NETWORK_NAME\": \"VPC_NETWORK_NAME\""
+        + "}"
+        + "},"
+        + "\"xds_server\": {"
+        + "\"api_type\": \"GRPC\","
+        + "\"bad_field\": \"bad_value\""
+        + "\"grpc_services\": "
+        + "[ {\"google_grpc\": {\"target_uri\": \"trafficdirector.googleapis.com:443\"} } ]"
+        + "} "
+        + "}";
+
+    try {
+      Bootstrapper.parseConfig(rawData);
+      fail("InvalidProtocolBufferException should have been thrown");
+    } catch (InvalidProtocolBufferException e) {
+      // Expected.
+    }
+  }
+}
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