Fix encoding of log levels

Author: shs96c

java/client/src/org/openqa/selenium/json/JsonOutput.java

@@ -114,7 +114,7 @@ public class JsonOutput implements Closeable {
         .put(Enum.class::isAssignableFrom, (obj, depth) -> append(asString(obj)))
         .put(File.class::isAssignableFrom, (obj, depth) -> append(((File) obj).getAbsolutePath()))
         .put(URL.class::isAssignableFrom, (obj, depth) -> append(asString(((URL) obj).toExternalForm())))
-        .put(Level.class::isAssignableFrom, (obj, depth) -> append(LogLevelMapping.getName((Level) obj)))
+        .put(Level.class::isAssignableFrom, (obj, depth) -> append(asString(LogLevelMapping.getName((Level) obj))))
         .put(
             SessionId.class::isAssignableFrom,
             (obj, depth) -> {

java/client/test/org/openqa/selenium/json/JsonOutputTest.java

@@ -637,6 +637,13 @@ public void canDisablePrettyPrintingToGetSingleLineOutput() {
     assertEquals(-1, json.indexOf("\n"));
   }
 
+  @Test
+  public void shouldEncodeLogLevelsAsStrings() {
+    String converted = convert(Level.INFO);
+
+    assertEquals("\"INFO\"", converted);
+  }
+
   private String convert(Object toConvert) {
     try (Writer writer = new StringWriter();
          JsonOutput jsonOutput = new Json().newOutput(writer)) {