diff --git a/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleContextCustomizerFactory.java b/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleContextCustomizerFactory.java
index 0574f809..93c72a81 100644
--- a/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleContextCustomizerFactory.java
+++ b/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleContextCustomizerFactory.java
@@ -62,9 +62,12 @@ class ModuleContextCustomizerFactory implements ContextCustomizerFactory {
 		private static final Logger LOGGER = LoggerFactory.getLogger(ModuleContextCustomizer.class);
 
 		private final Supplier<ModuleTestExecution> execution;
+		private final Class<?> source;
+
+		ModuleContextCustomizer(Class<?> testClass) {
 
-		private ModuleContextCustomizer(Class<?> testClass) {
 			this.execution = ModuleTestExecution.of(testClass);
+			this.source = testClass;
 		}
 
 		/*
@@ -143,6 +146,32 @@ class ModuleContextCustomizerFactory implements ContextCustomizerFactory {
 			LOGGER.info("");
 		}
 
+		/*
+		 * (non-Javadoc)
+		 * @see java.lang.Object#equals(java.lang.Object)
+		 */
+		@Override
+		public boolean equals(Object obj) {
+			if (this == obj) {
+				return true;
+			}
+
+			if (!(obj instanceof ModuleContextCustomizer that)) {
+				return false;
+			}
+
+			return Objects.equals(this.source, that.source);
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * @see java.lang.Object#hashCode()
+		 */
+		@Override
+		public int hashCode() {
+			return Objects.hashCode(source);
+		}
+
 		private static void logHeadline(String headline) {
 			logHeadline(headline, () -> {});
 		}
@@ -153,33 +182,6 @@ class ModuleContextCustomizerFactory implements ContextCustomizerFactory {
 			LOGGER.info(headline);
 			additional.run();
 		}
-
-		/*
-		 * (non-Javadoc)
-		 * @see java.lang.Object#equals(java.lang.Object)
-		 */
-		@Override
-		public boolean equals(Object obj) {
-
-			if (this == obj) {
-				return true;
-			}
-
-			if (!(obj instanceof ModuleContextCustomizer that)) {
-				return false;
-			}
-
-			return Objects.equals(execution, that.execution);
-		}
-
-		/*
-		 * (non-Javadoc)
-		 * @see java.lang.Object#hashCode()
-		 */
-		@Override
-		public int hashCode() {
-			return Objects.hash(execution);
-		}
 	}
 
 	/**
diff --git a/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleTypeExcludeFilter.java b/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleTypeExcludeFilter.java
index 38835722..330c0e9f 100644
--- a/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleTypeExcludeFilter.java
+++ b/spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleTypeExcludeFilter.java
@@ -22,6 +22,7 @@ import java.util.function.Supplier;
 import org.springframework.boot.context.TypeExcludeFilter;
 import org.springframework.core.type.classreading.MetadataReader;
 import org.springframework.core.type.classreading.MetadataReaderFactory;
+import org.springframework.util.Assert;
 
 /**
  * @author Oliver Drotbohm
@@ -29,9 +30,14 @@ import org.springframework.core.type.classreading.MetadataReaderFactory;
 class ModuleTypeExcludeFilter extends TypeExcludeFilter {
 
 	private final Supplier<ModuleTestExecution> execution;
+	private final Class<?> source;
 
 	public ModuleTypeExcludeFilter(Class<?> testClass) {
+
+		Assert.notNull(testClass, "Test class must not be null!");
+
 		this.execution = ModuleTestExecution.of(testClass);
+		this.source = testClass;
 	}
 
 	/*
@@ -58,7 +64,7 @@ class ModuleTypeExcludeFilter extends TypeExcludeFilter {
 			return false;
 		}
 
-		return Objects.equals(execution, that.execution);
+		return Objects.equals(source, that.source);
 	}
 
 	/*
@@ -67,6 +73,6 @@ class ModuleTypeExcludeFilter extends TypeExcludeFilter {
 	 */
 	@Override
 	public int hashCode() {
-		return Objects.hash(execution);
+		return Objects.hash(source);
 	}
 }
diff --git a/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleContextCustomizerUnitTests.java b/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleContextCustomizerUnitTests.java
new file mode 100644
index 00000000..20fbf570
--- /dev/null
+++ b/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleContextCustomizerUnitTests.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2024 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.springframework.modulith.test;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.modulith.test.ModuleContextCustomizerFactory.ModuleContextCustomizer;
+
+/**
+ * Unit tests for {@link ModuleTypeExcludeFilter}.
+ *
+ * @author Oliver Drotbohm
+ */
+class ModuleContextCustomizerUnitTests {
+
+	@Test
+	void instancesForSameTargetTypeAreEqual() {
+
+		var left = new ModuleContextCustomizer(Object.class);
+		var right = new ModuleContextCustomizer(Object.class);
+
+		assertThat(left).isEqualTo(right);
+		assertThat(right).isEqualTo(left);
+		assertThat(left).hasSameHashCodeAs(right);
+	}
+}
diff --git a/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleTypeExcludeFilterUnitTests.java b/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleTypeExcludeFilterUnitTests.java
new file mode 100644
index 00000000..0186b55c
--- /dev/null
+++ b/spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleTypeExcludeFilterUnitTests.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2024 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.springframework.modulith.test;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for {@link ModuleTypeExcludeFilter}.
+ *
+ * @author Oliver Drotbohm
+ */
+class ModuleTypeExcludeFilterUnitTests {
+
+	@Test
+	void instancesForSameTargetTypeAreEqual() {
+
+		var left = new ModuleTypeExcludeFilter(Object.class);
+		var right = new ModuleTypeExcludeFilter(Object.class);
+
+		assertThat(left).isEqualTo(right);
+		assertThat(right).isEqualTo(left);
+		assertThat(left).hasSameHashCodeAs(right);
+	}
+}