add unit tests for ResolverUtil.

Author: peterchenhdu

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

@@ -0,0 +1,129 @@
+/**
+ * Copyright 2009-2019 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 org.apache.ibatis.annotations.CacheNamespace;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Set;
+
+/**
+ * Unit tests for {@link ResolverUtil}.
+ *
+ * @author Pi Chen
+ * @since 3.5.2
+ */
+
+public class ResolverUtilTest {
+  private ClassLoader currentContextClassLoader;
+
+  @Before
+  public void setUp() throws Exception {
+    currentContextClassLoader = Thread.currentThread().getContextClassLoader();
+  }
+
+  @Test
+  public void getClasses() {
+    Assert.assertEquals(new ResolverUtil<>().getClasses().size(), 0);
+  }
+
+  @Test
+  public void getClassLoader() {
+    Assert.assertEquals(new ResolverUtil<>().getClassLoader(), currentContextClassLoader);
+  }
+
+  @Test
+  public void setClassLoader() {
+    ResolverUtil resolverUtil = new ResolverUtil();
+    resolverUtil.setClassLoader(new ClassLoader() {
+      // do nothing...
+    });
+    Assert.assertNotEquals(resolverUtil.getClassLoader(), currentContextClassLoader);
+  }
+
+  @Test
+  public void findImplementationsWithNullPackageName() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findImplementations(VFS.class, null);
+    Assert.assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  public void findImplementations() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findImplementations(VFS.class, "org.apache.ibatis.io");
+    Set<Class<? extends VFS>> classSets = resolverUtil.getClasses();
+    classSets.forEach(c -> Assert.assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  public void findAnnotatedWithNullPackageName() {
+    ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findAnnotated(CacheNamespace.class, null);
+    Assert.assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  public void findAnnotated() {
+    ResolverUtil<Object> resolverUtil = new ResolverUtil<>();
+    resolverUtil.findAnnotated(CacheNamespace.class, "org.apache.ibatis.binding");
+    Set<Class<?>> classSets = resolverUtil.getClasses();
+    classSets.forEach(c -> Assert.assertNotNull(c.getAnnotation(CacheNamespace.class)));
+  }
+
+  @Test
+  public 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();
+    classSets.forEach(c -> Assert.assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  public void getPackagePath() {
+    ResolverUtil resolverUtil = new ResolverUtil();
+    Assert.assertNull(resolverUtil.getPackagePath(null));
+    Assert.assertEquals(resolverUtil.getPackagePath("org.apache.ibatis.io"), "org/apache/ibatis/io");
+  }
+
+  @Test
+  public 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();
+    classSets.forEach(c -> Assert.assertTrue(VFS.class.isAssignableFrom(c)));
+  }
+
+  @Test
+  public void addIfNotMatching() {
+    ResolverUtil<VFS> resolverUtil = new ResolverUtil<>();
+    resolverUtil.addIfMatching(new ResolverUtil.IsA(VFS.class), "org/apache/ibatis/io/Xxx.class");
+    Assert.assertEquals(resolverUtil.getClasses().size(), 0);
+  }
+
+  @Test
+  public void testToString() {
+    ResolverUtil.IsA isa = new ResolverUtil.IsA(VFS.class);
+    Assert.assertTrue(isa.toString().contains(VFS.class.getSimpleName()));
+
+    ResolverUtil.AnnotatedWith annotatedWith = new ResolverUtil.AnnotatedWith(CacheNamespace.class);
+    Assert.assertTrue(annotatedWith.toString().contains("@" + CacheNamespace.class.getSimpleName()));
+  }
+
+}