Implement ServiceConnectionContextCustomizer equals and hashcode for key

Update `ServiceConnectionContextCustomizer` with `equals` and `hashcode`
methods so that it works correctly when part of a context cache key.

Closes gh-35216

spring-boot-project/spring-boot-testcontainers/src/main/java/org/springframework/boot/testcontainers/service/connection/ContainerConnectionSource.java

@@ -136,6 +136,10 @@ public final class ContainerConnectionSource<C extends Container<?>> implements
 		return this.containerSupplier;
 	}
 
+	Set<Class<?>> getConnectionDetailsTypes() {
+		return this.connectionDetailsTypes;
+	}
+
 	@Override
 	public String toString() {
 		return "@ServiceConnection source for %s".formatted(this.origin);

spring-boot-project/spring-boot-testcontainers/src/main/java/org/springframework/boot/testcontainers/service/connection/ServiceConnectionContextCustomizer.java

@@ -17,6 +17,10 @@
 package org.springframework.boot.testcontainers.service.connection;
 
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.testcontainers.containers.Container;
 
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
@@ -37,6 +41,8 @@ class ServiceConnectionContextCustomizer implements ContextCustomizer {
 
 	private final List<ContainerConnectionSource<?>> sources;
 
+	private final Set<CacheKey> keys;
+
 	private final ConnectionDetailsFactories connectionDetailsFactories;
 
 	ServiceConnectionContextCustomizer(List<ContainerConnectionSource<?>> sources) {
@@ -46,6 +52,7 @@ class ServiceConnectionContextCustomizer implements ContextCustomizer {
 	ServiceConnectionContextCustomizer(List<ContainerConnectionSource<?>> sources,
 			ConnectionDetailsFactories connectionDetailsFactories) {
 		this.sources = sources;
+		this.keys = sources.stream().map(CacheKey::new).collect(Collectors.toUnmodifiableSet());
 		this.connectionDetailsFactories = connectionDetailsFactories;
 	}
 
@@ -58,8 +65,37 @@ class ServiceConnectionContextCustomizer implements ContextCustomizer {
 		}
 	}
 
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null || getClass() != obj.getClass()) {
+			return false;
+		}
+		return this.keys.equals(((ServiceConnectionContextCustomizer) obj).keys);
+	}
+
+	@Override
+	public int hashCode() {
+		return this.keys.hashCode();
+	}
+
 	List<ContainerConnectionSource<?>> getSources() {
 		return this.sources;
 	}
 
+	/**
+	 * Relevant details from {@link ContainerConnectionSource} used as a
+	 * MergedContextConfiguration cache key.
+	 */
+	private static record CacheKey(String connectionName, Set<Class<?>> connectionDetailsTypes,
+			Container<?> container) {
+
+		CacheKey(ContainerConnectionSource<?> source) {
+			this(source.getConnectionName(), source.getConnectionDetailsTypes(), source.getContainerSupplier().get());
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-testcontainers/src/test/java/org/springframework/boot/testcontainers/service/connection/ServiceConnectionContextCustomizerTests.java

@@ -91,6 +91,54 @@ class ServiceConnectionContextCustomizerTests {
 		assertThat(beanDefinition.getBeanClass()).isEqualTo(TestJdbcConnectionDetails.class);
 	}
 
+	@Test
+	void equalsAndHashCode() {
+		PostgreSQLContainer<?> container1 = mock(PostgreSQLContainer.class);
+		PostgreSQLContainer<?> container2 = mock(PostgreSQLContainer.class);
+		MergedAnnotation<ServiceConnection> annotation1 = MergedAnnotation.of(ServiceConnection.class,
+				Map.of("name", "", "type", new Class<?>[0]));
+		MergedAnnotation<ServiceConnection> annotation2 = MergedAnnotation.of(ServiceConnection.class,
+				Map.of("name", "", "type", new Class<?>[0]));
+		MergedAnnotation<ServiceConnection> annotation3 = MergedAnnotation.of(ServiceConnection.class,
+				Map.of("name", "", "type", new Class<?>[] { JdbcConnectionDetails.class }));
+		// Connection Names
+		ServiceConnectionContextCustomizer n1 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container1)));
+		ServiceConnectionContextCustomizer n2 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container1)));
+		ServiceConnectionContextCustomizer n3 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "namex",
+						annotation1, () -> container1)));
+		assertThat(n1.hashCode()).isEqualTo(n2.hashCode());
+		assertThat(n1).isEqualTo(n2).isNotEqualTo(n3);
+		// Connection Details Types
+		ServiceConnectionContextCustomizer t1 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container1)));
+		ServiceConnectionContextCustomizer t2 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation2, () -> container1)));
+		ServiceConnectionContextCustomizer t3 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation3, () -> container1)));
+		assertThat(t1.hashCode()).isEqualTo(t2.hashCode());
+		assertThat(t1).isEqualTo(t2).isNotEqualTo(t3);
+		// Container
+		ServiceConnectionContextCustomizer c1 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container1)));
+		ServiceConnectionContextCustomizer c2 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container1)));
+		ServiceConnectionContextCustomizer c3 = new ServiceConnectionContextCustomizer(
+				List.of(new ContainerConnectionSource<>("test", this.origin, PostgreSQLContainer.class, "name",
+						annotation1, () -> container2)));
+		assertThat(c1.hashCode()).isEqualTo(c2.hashCode());
+		assertThat(c1).isEqualTo(c2).isNotEqualTo(c3);
+	}
+
 	/**
 	 * Test {@link JdbcConnectionDetails}.
 	 */