diff --git a/contribs/drt/src/test/java/org/matsim/contrib/drt/run/DrtConfigGroupTest.java b/contribs/drt/src/test/java/org/matsim/contrib/drt/run/DrtConfigGroupTest.java
new file mode 100644
index 00000000000..66187a54683
--- /dev/null
+++ b/contribs/drt/src/test/java/org/matsim/contrib/drt/run/DrtConfigGroupTest.java
@@ -0,0 +1,54 @@
+package org.matsim.contrib.drt.run;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.matsim.core.config.Config;
+import org.matsim.core.config.ConfigUtils;
+
+import com.google.common.base.VerifyException;
+
+class DrtConfigGroupTest {
+
+	@Test
+	void testHasDefaultDrtOptimizationConstraintsParam() {
+		Config config = ConfigUtils.createConfig();
+		DrtConfigGroup drtConfig = new DrtConfigGroup();
+		config.addModule(drtConfig);
+
+		// get DrtOptimizationConstraintsParams
+		DrtOptimizationConstraintsParams params = drtConfig.getDefaultDrtOptimizationConstraintsParam();
+
+		Assertions.assertEquals(DrtOptimizationConstraintsParams.DEFAULT_PARAMS_NAME, params.name);
+		Assertions.assertDoesNotThrow(() -> drtConfig.checkConsistency(config));
+	}
+
+	@Test
+	void testMultipleDrtOptimizationConstraintsParams() {
+		Config config = ConfigUtils.createConfig();
+		DrtConfigGroup drtConfig = new DrtConfigGroup();
+		config.addModule(drtConfig);
+
+		// add second DrtOptimizationConstraintsParams
+		DrtOptimizationConstraintsParams params = new DrtOptimizationConstraintsParams();
+		params.name = "test";
+		drtConfig.addParameterSet(params);
+
+		Assertions.assertEquals(2, drtConfig.getDrtOptimizationConstraintsParams().size());
+		Assertions.assertDoesNotThrow(() -> drtConfig.checkConsistency(config));
+	}
+
+	@Test
+	void testNoDuplicateDrtDrtOptimizationConstraintsParams() {
+		Config config = ConfigUtils.createConfig();
+		DrtConfigGroup drtConfig = new DrtConfigGroup();
+		config.addModule(drtConfig);
+
+		// add second DrtOptimizationConstraintsParams with same name
+		DrtOptimizationConstraintsParams params = new DrtOptimizationConstraintsParams();
+		params.name = DrtOptimizationConstraintsParams.DEFAULT_PARAMS_NAME;
+		drtConfig.addParameterSet(params);
+
+		Assertions.assertEquals(2, drtConfig.getDrtOptimizationConstraintsParams().size());
+		Assertions.assertThrows(VerifyException.class, () -> drtConfig.checkConsistency(config));
+	}
+}