Test status quo for SpringNamingPolicy

See gh-31272

spring-core/src/test/java/org/springframework/cglib/core/SpringNamingPolicyTests.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2002-2023 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.springframework.cglib.core;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringNamingPolicy}.
+ *
+ * @author Sam Brannen
+ * @since 6.0.13
+ */
+class SpringNamingPolicyTests {
+
+	private final Set<String> reservedClassNames = new HashSet<>();
+
+
+	@Test
+	void nullPrefix() {
+		assertThat(getClassName(null)).isEqualTo("org.springframework.cglib.empty.Object$$SpringCGLIB$$0");
+		assertThat(getClassName(null)).isEqualTo("org.springframework.cglib.empty.Object$$SpringCGLIB$$1");
+	}
+
+	@Test
+	void javaPrefix() {
+		assertThat(getClassName("java.util.ArrayList")).isEqualTo("_java.util.ArrayList$$SpringCGLIB$$0");
+		assertThat(getClassName("java.util.ArrayList")).isEqualTo("_java.util.ArrayList$$SpringCGLIB$$1");
+	}
+
+	@Test
+	void javaxPrefix() {
+		assertThat(getClassName("javax.sql.RowSet")).isEqualTo("_javax.sql.RowSet$$SpringCGLIB$$0");
+		assertThat(getClassName("javax.sql.RowSet")).isEqualTo("_javax.sql.RowSet$$SpringCGLIB$$1");
+	}
+
+	@Test
+	void examplePrefix() {
+		assertThat(getClassName("example.MyComponent")).isEqualTo("example.MyComponent$$SpringCGLIB$$0");
+		assertThat(getClassName("example.MyComponent")).isEqualTo("example.MyComponent$$SpringCGLIB$$1");
+	}
+
+	@Test
+	void prefixContainingSpringLabel() {
+		String generated1 = "example.MyComponent$$SpringCGLIB$$0";
+		String generated2 = "example.MyComponent$$SpringCGLIB$$1";
+
+		assertThat(getClassName(generated1)).isEqualTo(generated1);
+		assertThat(getClassName(generated1)).isEqualTo(generated2);
+	}
+
+	private String getClassName(String prefix) {
+		return getClassName(prefix, null, null);
+	}
+
+	private String getClassName(String prefix, String source, Object key) {
+		String className = SpringNamingPolicy.INSTANCE.getClassName(prefix, source, key, reservedClassNames::contains);
+		reservedClassNames.add(className);
+		return className;
+	}
+
+}