Merge pull request #1568 from peterchenhdu/master

add unit tests for ResolverUtil.

Author: kazuki43zoo

src/test/java/org/apache/ibatis/io/ResolverUtilTest.java

@@ -0,0 +1,151 @@
+/**
+ *    Copyright 2009-2019 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
+ *
+ *       http://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.apache.ibatis.io;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Set;
+
+import org.apache.ibatis.annotations.CacheNamespace;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for {@link ResolverUtil}.
+ *
+ * @author Pi Chen
+ * @since 3.5.2
+ */
+
+class ResolverUtilTest {
+  private static ClassLoader currentContextClassLoader;
+
+  @BeforeAll
+  static void setUp() {
+    currentContextClassLoader = Thread.currentThread().getContextClassLoader();
+  }
+
+  @Test
+  void getClasses() {
+    assertEquals(new ResolverUtil<>().getClasses().size(), 0);
+  }
+
+  @Test
+  void getClassLoader() {
+    assertEquals(new ResolverUtil<>().getClassLoader(), currentContextClassLoader);
+  }
+
+  @Test
+  void setClassLoader() {
+    ResolverUtil resolverUtil = new ResolverUtil();
+    AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
+      resolverUtil.setClassLoader(new ClassLoader() {
+      });
+      return null;
+    });
+    assertNotEquals(resolverUtil.getClassLoader(), currentContextClassLoader);
+  }
+
+  @Test
+  void findImplementationsWithNullPackageName() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findImplementations(VFS.class, null);
+    assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  void findImplementations() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findImplementations(VFS.class, "org.apache.ibatis.io");
+    Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
+    //org.apache.ibatis.io.VFS
+    //org.apache.ibatis.io.DefaultVFS
+    //org.apache.ibatis.io.JBoss6VFS
+    assertEquals(classSets.size(), 3); //fail if add a new VFS implementation in this package!!!
+    classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  void findAnnotatedWithNullPackageName() {
+    ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findAnnotated(CacheNamespace.class, null);
+    assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  void findAnnotated() {
+    ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findAnnotated(CacheNamespace.class, this.getClass().getPackage().getName());
+    Set<Class<?>> classSets = resolverUtil.getClasses();
+    //org.apache.ibatis.io.ResolverUtilTest.TestMapper
+    assertEquals(classSets.size(), 1);
+    classSets.forEach(c -> assertNotNull(c.getAnnotation(CacheNamespace.class)));
+  }
+
+  @Test
+  void find() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.find(new ResolverUtil.IsA(VFS.class), "org.apache.ibatis.io");
+    Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
+    //org.apache.ibatis.io.VFS
+    //org.apache.ibatis.io.DefaultVFS
+    //org.apache.ibatis.io.JBoss6VFS
+    assertEquals(classSets.size(), 3);
+    classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  void getPackagePath() {
+    ResolverUtil resolverUtil = new ResolverUtil();
+    assertNull(resolverUtil.getPackagePath(null));
+    assertEquals(resolverUtil.getPackagePath("org.apache.ibatis.io"), "org/apache/ibatis/io");
+  }
+
+  @Test
+  void addIfMatching() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/DefaultVFS.class");
+    resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/VFS.class");
+    Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
+    assertEquals(classSets.size(), 2);
+    classSets.forEach(c -> assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  void addIfNotMatching() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/Xxx.class");
+    assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  void testToString() {
+    ResolverUtil.IsA isa = new ResolverUtil.IsA(VFS.class);
+    assertTrue(isa.toString().contains(VFS.class.getSimpleName()));
+
+    ResolverUtil.AnnotatedWith annotatedWith = new ResolverUtil.AnnotatedWith(CacheNamespace.class);
+    assertTrue(annotatedWith.toString().contains("@" + CacheNamespace.class.getSimpleName()));
+  }
+
+
+  @CacheNamespace(readWrite = false)
+  private interface TestMapper {
+    //test ResolverUtil.findAnnotated method
+  }
+
+}