diff --git a/spock-specs/src/test/groovy/org/spockframework/smoke/extension/RandomRunOrderExtensionSpec.groovy b/spock-specs/src/test/groovy/org/spockframework/smoke/extension/RandomRunOrderExtensionSpec.groovy
new file mode 100644
index 0000000000..b50452fd18
--- /dev/null
+++ b/spock-specs/src/test/groovy/org/spockframework/smoke/extension/RandomRunOrderExtensionSpec.groovy
@@ -0,0 +1,142 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed 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
+ *     https://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.spockframework.smoke.extension
+
+import groovy.transform.Canonical
+import groovy.transform.ToString
+import org.spockframework.EmbeddedSpecification
+import org.spockframework.runtime.extension.builtin.RandomRunOrderExtension
+import spock.lang.Retry
+
+import static spock.lang.Retry.Mode.SETUP_FEATURE_CLEANUP
+
+class RandomRunOrderExtensionSpec extends EmbeddedSpecification {
+  static ThreadLocal<List<SpecExecution>> executionsTL = new ThreadLocal<>()
+
+  List<Class> specs
+
+  def setup() {
+    executionsTL.set([])
+    compiler.addClassMemberImport(RandomRunOrderExtensionSpec)
+    specs = compiler.compileWithImports("""
+class FirstSpec extends Specification {
+  @Shared execution = new SpecExecution(spec: this.class.simpleName)
+  def setup() { execution.features << specificationContext.currentFeature.name }
+  def cleanupSpec() { executionsTL.get() << execution }
+  def one() { expect: true }
+  def two() { expect: true }
+  def three() { expect: true }
+}
+
+class SecondSpec extends Specification {
+  @Shared execution = new SpecExecution(spec: this.class.simpleName)
+  def setup() { execution.features << specificationContext.currentFeature.name }
+  def cleanupSpec() { executionsTL.get() << execution }
+  def one() { expect: true }
+  def two() { expect: true }
+  def three() { expect: true }
+}
+
+class ThirdSpec extends Specification {
+  @Shared execution = new SpecExecution(spec: this.class.simpleName)
+  def setup() { execution.features << specificationContext.currentFeature.name }
+  def cleanupSpec() { executionsTL.get() << execution }
+  def one() { expect: true }
+  def two() { expect: true }
+  def three() { expect: true }
+}
+  """)
+  }
+
+  def "deterministic default order"() {
+    runner.configurationScript = {
+      runner {}
+    }
+    runner.extensionClasses << RandomRunOrderExtension
+
+    when:
+    runner.runClasses(specs)
+    def executions = executionsTL.get()
+
+    then:
+    executions*.spec == ['FirstSpec', 'SecondSpec', 'ThirdSpec']
+    executions*.features == [['one', 'two', 'three'], ['one', 'two', 'three'], ['one', 'two', 'three']]
+  }
+
+  @Retry(count = 50, mode = SETUP_FEATURE_CLEANUP)  // if random order == deterministic order
+  def "random spec order"() {
+    runner.configurationScript = {
+      runner {
+        randomizeSpecRunOrder true
+        randomizeFeatureRunOrder false
+      }
+    }
+    runner.extensionClasses << RandomRunOrderExtension
+
+    when:
+    runner.runClasses(specs)
+    def executions = executionsTL.get()
+
+    then:
+    executions*.spec != ['FirstSpec', 'SecondSpec', 'ThirdSpec']
+    executions*.features == [['one', 'two', 'three'], ['one', 'two', 'three'], ['one', 'two', 'three']]
+  }
+
+  @Retry(count = 50, mode = SETUP_FEATURE_CLEANUP)  // if random order == deterministic order
+  def "random feature order"() {
+    runner.configurationScript = {
+      runner {
+        randomizeSpecRunOrder false
+        randomizeFeatureRunOrder true
+      }
+    }
+    runner.extensionClasses << RandomRunOrderExtension
+
+    when:
+    runner.runClasses(specs)
+    def executions = executionsTL.get()
+
+    then:
+    executions*.spec == ['FirstSpec', 'SecondSpec', 'ThirdSpec']
+    executions*.features != [['one', 'two', 'three'], ['one', 'two', 'three'], ['one', 'two', 'three']]
+  }
+
+  @Retry(count = 50, mode = SETUP_FEATURE_CLEANUP)  // if random order == deterministic order
+  def "random feature and spec order"() {
+    runner.configurationScript = {
+      runner {
+        randomizeSpecRunOrder true
+        randomizeFeatureRunOrder true
+      }
+    }
+    runner.extensionClasses << RandomRunOrderExtension
+
+    when:
+    runner.runClasses(specs)
+    def executions = executionsTL.get()
+
+    then:
+    executions*.spec != ['FirstSpec', 'SecondSpec', 'ThirdSpec']
+    executions*.features != [['one', 'two', 'three'], ['one', 'two', 'three'], ['one', 'two', 'three']]
+  }
+
+  @Canonical
+  @ToString(includePackage = false)
+  static class SpecExecution {
+    String spec
+    List<String> features = []
+  }
+
+}