diff --git a/logstash-core/spec/logstash/settings/string_spec.rb b/logstash-core/spec/logstash/settings/string_spec.rb
index 4ce66795dad..b82fd723056 100644
--- a/logstash-core/spec/logstash/settings/string_spec.rb
+++ b/logstash-core/spec/logstash/settings/string_spec.rb
@@ -18,6 +18,7 @@
 require "spec_helper"
 require "logstash/settings"
 
+# Mirrored in java class org.logstash.settings.StringSettingTest
 describe LogStash::Setting::StringSetting do
   let(:possible_values) { ["a", "b", "c"] }
   subject { described_class.new("mytext", possible_values.first, true, possible_values) }
diff --git a/logstash-core/src/test/java/org/logstash/settings/BooleanTest.java b/logstash-core/src/test/java/org/logstash/settings/BooleanTest.java
index 0886f6710b8..c99f6552b70 100644
--- a/logstash-core/src/test/java/org/logstash/settings/BooleanTest.java
+++ b/logstash-core/src/test/java/org/logstash/settings/BooleanTest.java
@@ -1,3 +1,22 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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 org.logstash.settings;
 
 import org.junit.Assert;
diff --git a/logstash-core/src/test/java/org/logstash/settings/StringSettingTest.java b/logstash-core/src/test/java/org/logstash/settings/StringSettingTest.java
new file mode 100644
index 00000000000..9613e89e784
--- /dev/null
+++ b/logstash-core/src/test/java/org/logstash/settings/StringSettingTest.java
@@ -0,0 +1,50 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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 org.logstash.settings;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+// Mirrored from logstash-core/spec/logstash/settings/string_spec.rb
+public class StringSettingTest {
+
+    private static final List<String> POSSIBLE_VALUES = List.of("a", "b", "c");
+    private StringSetting sut;
+
+    @Before
+    public void setUp() throws Exception {
+        sut = new StringSetting("mytext", POSSIBLE_VALUES.iterator().next(), true, POSSIBLE_VALUES);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void whenSetValueNotPresentInPossibleValuesThenThrowAnError() {
+        sut.set("d");
+    }
+
+    @Test
+    public void whenSetValuePresentInPossibleValuesThenSetValue() {
+        sut.set("a");
+
+        assertEquals("a", sut.value());
+    }
+}
\ No newline at end of file