DexClassLoaderTest.java revision 0097708dae398465c3da40cc7f9a2dfde5571364 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package dalvik.system;
18
19import java.lang.reflect.InvocationTargetException;
20import java.lang.reflect.Method;
21import java.io.File;
22import java.io.FileOutputStream;
23import java.io.IOException;
24import java.io.InputStream;
25import libcore.base.Streams;
26import junit.framework.TestCase;
27
28/**
29 * Tests for the class {@link DexClassLoader}.
30 */
31public class DexClassLoaderTest extends TestCase {
32    private static final String PACKAGE_PATH = "dalvik/system/";
33    private static final String JAR_NAME = "loading-test.jar";
34    private static final File TMP_DIR =
35        new File(System.getProperty("java.io.tmpdir"), "loading-test");
36    private static final File TMP_JAR = new File(TMP_DIR, JAR_NAME);
37
38    protected void setUp() throws IOException {
39        TMP_DIR.mkdirs();
40
41        ClassLoader cl = DexClassLoaderTest.class.getClassLoader();
42        InputStream in = cl.getResourceAsStream(PACKAGE_PATH + JAR_NAME);
43        FileOutputStream out = new FileOutputStream(TMP_JAR);
44
45        Streams.copy(in, out);
46        in.close();
47        out.close();
48    }
49
50    /**
51     * Helper to construct an instance to test.
52     */
53    static private DexClassLoader createInstance() {
54        return new DexClassLoader(TMP_JAR.getAbsolutePath(),
55                                  TMP_DIR.getAbsolutePath(),
56                                  null,
57                                  ClassLoader.getSystemClassLoader());
58    }
59
60    /**
61     * Just a trivial test of construction. This one merely makes
62     * sure that a valid construction doesn't fail; it doesn't try
63     * to verify anything about the constructed instance. (Other
64     * tests will do that.)
65     */
66    public void test_init() {
67        createInstance();
68    }
69
70    /**
71     * Check that a class in the jar file may be used successfully. In this
72     * case, a trivial static method is called.
73     */
74    public void test_simpleUse()
75            throws ClassNotFoundException, NoSuchMethodException,
76            IllegalAccessException, InvocationTargetException {
77        DexClassLoader dcl = createInstance();
78        Class c = dcl.loadClass("test.Test1");
79        Method m = c.getMethod("test", (Class[]) null);
80        String result = (String) m.invoke(null, (Object[]) null);
81
82        assertSame("blort", result);
83    }
84}
85