diff --git a/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java b/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java
index 3b2425ec..f0c697bf 100644
--- a/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java
+++ b/extras/src/test/java/com/google/gson/graph/GraphAdapterBuilderTest.java
@@ -58,7 +58,7 @@ public final class GraphAdapterBuilderTest {
         "'0x2':{'name':'SCISSORS','beats':'0x3'}," +
         "'0x3':{'name':'PAPER','beats':'0x1'}}";
 
-    GsonBuilder gsonBuilder = new GsonBuilder();
+    GsonBuilder gsonBuilder = new GsonBuilder().setLenient();
     new GraphAdapterBuilder()
         .addType(Roshambo.class)
         .registerOn(gsonBuilder);
@@ -77,7 +77,7 @@ public final class GraphAdapterBuilderTest {
   public void testDeserializationDirectSelfReference() {
     String json = "{'0x1':{'name':'SUICIDE','beats':'0x1'}}";
 
-    GsonBuilder gsonBuilder = new GsonBuilder();
+    GsonBuilder gsonBuilder = new GsonBuilder().setLenient();
     new GraphAdapterBuilder()
         .addType(Roshambo.class)
         .registerOn(gsonBuilder);
@@ -113,7 +113,7 @@ public final class GraphAdapterBuilderTest {
     Type listOfAnyType = new TypeToken<List<?>>() {}.getType();
     Type listOfListsType = new TypeToken<List<List<?>>>() {}.getType();
 
-    GsonBuilder gsonBuilder = new GsonBuilder();
+    GsonBuilder gsonBuilder = new GsonBuilder().setLenient();
     new GraphAdapterBuilder()
         .addType(listOfListsType)
         .addType(listOfAnyType)
@@ -132,7 +132,7 @@ public final class GraphAdapterBuilderTest {
     new Employee("Jesse", google);
     new Employee("Joel", google);
 
-    GsonBuilder gsonBuilder = new GsonBuilder();
+    GsonBuilder gsonBuilder = new GsonBuilder().setLenient();
     new GraphAdapterBuilder()
         .addType(Company.class)
         .addType(Employee.class)
@@ -147,7 +147,7 @@ public final class GraphAdapterBuilderTest {
 
   @Test
   public void testDeserializationWithMultipleTypes() {
-    GsonBuilder gsonBuilder = new GsonBuilder();
+    GsonBuilder gsonBuilder = new GsonBuilder().setLenient();
     new GraphAdapterBuilder()
         .addType(Company.class)
         .addType(Employee.class)
diff --git a/extras/src/test/java/com/google/gson/interceptors/InterceptorTest.java b/extras/src/test/java/com/google/gson/interceptors/InterceptorTest.java
index 39d618a5..a49960cb 100644
--- a/extras/src/test/java/com/google/gson/interceptors/InterceptorTest.java
+++ b/extras/src/test/java/com/google/gson/interceptors/InterceptorTest.java
@@ -46,6 +46,7 @@ public final class InterceptorTest extends TestCase {
     this.gson = new GsonBuilder()
         .registerTypeAdapterFactory(new InterceptorFactory())
         .enableComplexMapKeySerialization()
+        .setLenient()
         .create();
   }
 
@@ -109,6 +110,7 @@ public final class InterceptorTest extends TestCase {
           }
         })
         .registerTypeAdapterFactory(new InterceptorFactory())
+        .setLenient()
         .create();
     UserGroup userGroup = gson.fromJson("{user:{name:'bob',password:'pwd'}}", UserGroup.class);
     assertEquals(User.DEFAULT_EMAIL, userGroup.user.email);
diff --git a/extras/src/test/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactoryTest.java b/extras/src/test/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactoryTest.java
index 8c62bef7..fddb97d5 100644
--- a/extras/src/test/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactoryTest.java
+++ b/extras/src/test/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactoryTest.java
@@ -30,6 +30,7 @@ public final class RuntimeTypeAdapterFactoryTest extends TestCase {
         .registerSubtype(CreditCard.class);
     Gson gson = new GsonBuilder()
         .registerTypeAdapterFactory(rta)
+        .setLenient()
         .create();
 
     CreditCard original = new CreditCard("Jesse", 234);
@@ -47,6 +48,7 @@ public final class RuntimeTypeAdapterFactoryTest extends TestCase {
         .registerSubtype(BillingInstrument.class);
     Gson gson = new GsonBuilder()
         .registerTypeAdapterFactory(rta)
+        .setLenient()
         .create();
 
     BillingInstrument original = new BillingInstrument("Jesse");
diff --git a/extras/src/test/java/com/google/gson/typeadapters/UtcDateTypeAdapterTest.java b/extras/src/test/java/com/google/gson/typeadapters/UtcDateTypeAdapterTest.java
index fe4104fb..2b549451 100644
--- a/extras/src/test/java/com/google/gson/typeadapters/UtcDateTypeAdapterTest.java
+++ b/extras/src/test/java/com/google/gson/typeadapters/UtcDateTypeAdapterTest.java
@@ -29,6 +29,7 @@ import junit.framework.TestCase;
 public final class UtcDateTypeAdapterTest extends TestCase {
   private final Gson gson = new GsonBuilder()
     .registerTypeAdapter(Date.class, new UtcDateTypeAdapter())
+    .setLenient()
     .create();
 
   public void testLocalTimeZone() {
@@ -56,6 +57,7 @@ public final class UtcDateTypeAdapterTest extends TestCase {
   public void testUtcDatesOnJdkBefore1_7() {
     Gson gson = new GsonBuilder()
       .registerTypeAdapter(Date.class, new UtcDateTypeAdapter())
+      .setLenient()
       .create();
     gson.fromJson("'2014-12-05T04:00:00.000Z'", Date.class);
   }
diff --git a/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithComplexAndRepeatedFieldsTest.java b/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithComplexAndRepeatedFieldsTest.java
index 8e59d5d1..eae8742a 100644
--- a/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithComplexAndRepeatedFieldsTest.java
+++ b/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithComplexAndRepeatedFieldsTest.java
@@ -45,6 +45,7 @@ public class ProtosWithComplexAndRepeatedFieldsTest extends TestCase {
                 ProtoTypeAdapter.newBuilder()
                     .setEnumSerialization(EnumSerialization.NUMBER)
                     .build())
+            .setLenient()
             .create();
     upperCamelGson =
         new GsonBuilder()
@@ -53,6 +54,7 @@ public class ProtosWithComplexAndRepeatedFieldsTest extends TestCase {
                     .setFieldNameSerializationFormat(
                         CaseFormat.LOWER_UNDERSCORE, CaseFormat.UPPER_CAMEL)
                     .build())
+            .setLenient()
             .create();
   }
 
diff --git a/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithPrimitiveTypesTest.java b/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithPrimitiveTypesTest.java
index 2e9d0e17..12738fa7 100644
--- a/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithPrimitiveTypesTest.java
+++ b/proto/src/test/java/com/google/gson/protobuf/functional/ProtosWithPrimitiveTypesTest.java
@@ -34,6 +34,7 @@ public class ProtosWithPrimitiveTypesTest extends TestCase {
       GeneratedMessageV3.class, ProtoTypeAdapter.newBuilder()
           .setEnumSerialization(EnumSerialization.NUMBER)
           .build())
+      .setLenient()
       .create();
   }