fix issue 2769

Author: IlCommittatore

gson/src/main/java/com/google/gson/stream/JsonReader.java

@@ -1255,6 +1255,7 @@ private void skipUnquotedValue() throws IOException {
       int i = 0;
       for (; pos + i < limit; i++) {
         switch (buffer[pos + i]) {
+          case '"':
           case '/':
           case '\\':
           case ';':

gson/src/test/java/com/google/gson/stream/JsonReaderTest.java

@@ -29,11 +29,15 @@
 import static org.junit.Assert.assertThrows;
 
 import com.google.gson.Strictness;
+import com.google.gson.internal.bind.TypeAdapters;
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
+import java.io.StringWriter;
 import java.util.Arrays;
+import java.util.Iterator;
+import java.util.stream.Stream;
 import org.junit.Ignore;
 import org.junit.Test;
 
@@ -2170,6 +2174,27 @@ private static void assertDocument(String document, Object... expectations) thro
     }
   }
 
+  @Test
+  public void testJsonReaderWithStrictnessSetToLenientAndNullValue() throws IOException {
+    Iterator<String> iterator = Stream.of(null, "value1", "value2").iterator();
+    StringWriter str = new StringWriter();
+
+    try (JsonWriter writer = new JsonWriter(str)) {
+      writer.setStrictness(Strictness.LENIENT);
+      while (iterator.hasNext()) {
+        TypeAdapters.STRING.write(writer, iterator.next());
+      }
+      writer.flush();
+    }
+
+    JsonReader reader = new JsonReader(new StringReader(str.toString()));
+    reader.setStrictness(Strictness.LENIENT);
+
+    assertThat(TypeAdapters.STRING.read(reader)).isEqualTo("null");
+    assertThat(TypeAdapters.STRING.read(reader)).isEqualTo("value1");
+    assertThat(TypeAdapters.STRING.read(reader)).isEqualTo("value2");
+  }
+
   /** Returns a reader that returns one character at a time. */
   private static Reader reader(String s) {
     /* if (true) */ return new StringReader(s);