PackageParserTest.java revision 988149c925b583f5c77f567fa622e39309bc4ae9 
1/*
2 * Copyright (C) 2016 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 */
16package com.android.server.pm;
17
18import android.content.pm.PackageParser;
19import android.support.test.runner.AndroidJUnit4;
20import android.test.suitebuilder.annotation.MediumTest;
21
22import java.io.File;
23import java.nio.charset.StandardCharsets;
24
25import static org.junit.Assert.*;
26import org.junit.Before;
27import org.junit.Test;
28import org.junit.runner.RunWith;
29
30import libcore.io.IoUtils;
31
32@RunWith(AndroidJUnit4.class)
33@MediumTest
34public class PackageParserTest {
35    private File mTmpDir;
36    private static final File FRAMEWORK = new File("/system/framework/framework-res.apk");
37
38    @Before
39    public void setUp() {
40        // Create a new temporary directory for each of our tests.
41        mTmpDir = IoUtils.createTemporaryDirectory("PackageParserTest");
42    }
43
44    @Test
45    public void testParse_noCache() throws Exception {
46        PackageParser pp = new CachePackageNameParser();
47        PackageParser.Package pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */,
48                false /* useCaches */);
49        assertNotNull(pkg);
50
51        pp.setCacheDir(mTmpDir);
52        pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */,
53                false /* useCaches */);
54        assertNotNull(pkg);
55
56        // Make sure that we always write out a cache entry for future reference,
57        // whether or not we're asked to use caches.
58        assertEquals(1, mTmpDir.list().length);
59    }
60
61    @Test
62    public void testParse_withCache() throws Exception {
63        PackageParser pp = new CachePackageNameParser();
64
65        pp.setCacheDir(mTmpDir);
66        // The first parse will write this package to the cache.
67        pp.parsePackage(FRAMEWORK, 0 /* parseFlags */, true /* useCaches */);
68
69        // Now attempt to parse the package again, should return the
70        // cached result.
71        PackageParser.Package pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */,
72                true /* useCaches */);
73        assertEquals("cache_android", pkg.packageName);
74
75        // Try again, with useCaches == false, shouldn't return the parsed
76        // result.
77        pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */, false /* useCaches */);
78        assertEquals("android", pkg.packageName);
79
80        // We haven't set a cache directory here : the parse should still succeed,
81        // just not using the cached results.
82        pp = new CachePackageNameParser();
83        pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */, true /* useCaches */);
84        assertEquals("android", pkg.packageName);
85
86        pkg = pp.parsePackage(FRAMEWORK, 0 /* parseFlags */, false /* useCaches */);
87        assertEquals("android", pkg.packageName);
88    }
89
90    /**
91     * A trivial subclass of package parser that only caches the package name, and throws away
92     * all other information.
93     */
94    public static class CachePackageNameParser extends PackageParser {
95        @Override
96        public byte[] toCacheEntry(Package pkg) {
97            return ("cache_" + pkg.packageName).getBytes(StandardCharsets.UTF_8);
98        }
99
100        @Override
101        public Package fromCacheEntry(byte[] cacheEntry) {
102            return new Package(new String(cacheEntry, StandardCharsets.UTF_8));
103        }
104    }
105}
106