diff --git a/test/testhelper/TestHelper.java b/test/testhelper/TestHelper.java
new file mode 100644
index 000000000..0a06fd1c8
--- /dev/null
+++ b/test/testhelper/TestHelper.java
@@ -0,0 +1,23 @@
+package testhelper;
+
+import static net.sourceforge.plantuml.test.PlantUmlTestUtils.exportDiagram;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class TestHelper {
+
+	@Test
+	public void test_help_themes() throws Exception {
+
+		final String output = exportDiagram(
+				"@startuml",
+				"help themes",
+				"@enduml"
+		).asString();
+
+		assertThat(output)
+				.startsWith("                                \nHelp on themes")
+				.contains("bluegray", "hacker");
+	}
+}
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