TestUtil.java revision 28dc94ecb7ac94834b97e3f6be778b3f2bb734fd 
1package com.xtremelabs.robolectric.util;
2
3import com.xtremelabs.robolectric.RobolectricConfig;
4
5import java.io.File;
6import java.io.FileInputStream;
7import java.util.Collection;
8import java.util.Properties;
9
10import static org.junit.Assert.assertTrue;
11
12public abstract class TestUtil {
13    public static File testDirLocation;
14
15    public static void assertEquals(Collection<?> expected, Collection<?> actual) {
16        org.junit.Assert.assertEquals(stringify(expected), stringify(actual));
17    }
18
19    public static String stringify(Collection<?> collection) {
20        StringBuilder buf = new StringBuilder();
21        for (Object o : collection) {
22            if (buf.length() > 0) buf.append("\n");
23            buf.append(o);
24        }
25        return buf.toString();
26    }
27
28    public static <T> void assertInstanceOf(Class<? extends T> expectedClass, T object) {
29        Class actualClass = object.getClass();
30        assertTrue(expectedClass + " should be assignable from " + actualClass,
31                expectedClass.isAssignableFrom(actualClass));
32    }
33
34    public static File file(String... pathParts) {
35        return file(new File("."), pathParts);
36    }
37
38    public static File file(File f, String... pathParts) {
39        for (String pathPart : pathParts) {
40            f = new File(f, pathPart);
41        }
42        return f;
43    }
44
45    public static File resourcesBaseDir() {
46        if (testDirLocation == null) {
47            File testDir = file("src", "test", "resources");
48            if (hasTestManifest(testDir)) return testDirLocation = testDir;
49
50            File roboTestDir = file("robolectric", "src", "test", "resources");
51            if (hasTestManifest(roboTestDir)) return testDirLocation = roboTestDir;
52
53            File submoduleDir = file("submodules", "robolectric", "src", "test", "resources");
54            if (hasTestManifest(submoduleDir)) return testDirLocation = submoduleDir;
55
56            throw new RuntimeException("can't find your TestAndroidManifest.xml in "
57                    + testDir.getAbsolutePath() + " or " + roboTestDir.getAbsolutePath());
58        } else {
59            return testDirLocation;
60        }
61    }
62
63    private static boolean hasTestManifest(File testDir) {
64        return new File(testDir, "TestAndroidManifest.xml").isFile();
65    }
66
67    public static File resourceFile(String... pathParts) {
68        return file(resourcesBaseDir(), pathParts);
69    }
70
71    public static RobolectricConfig newConfig(String androidManifestFile) {
72        return new RobolectricConfig(resourceFile(androidManifestFile), null, null);
73    }
74
75    public static File getSystemResourceValuesDir() throws Exception {
76        Properties localProperties = new Properties();
77        localProperties.load(new FileInputStream(new File("local.properties")));
78        PropertiesHelper.doSubstitutions(localProperties);
79        return new File(localProperties.getProperty("sdk.dir"), "platforms/android-10/data/res/values");
80    }
81}
82