Add very basic Robolectric tests

Author: samtstern

app/build.gradle

@@ -10,6 +10,8 @@ android {
         targetSdkVersion targetSdk
         versionCode 1
         versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -24,4 +26,7 @@ dependencies {
     compile "com.android.support:appcompat-v7:$support_library_version"
 
     compile project(':easypermissions')
+
+    testCompile 'junit:junit:4.12'
+    testCompile 'org.robolectric:robolectric:3.3.2'
 }

app/src/test/java/pub/devrel/easypermissions/sample/EasyPermissionsLowApiTest.java

@@ -0,0 +1,43 @@
+package pub.devrel.easypermissions.sample;
+
+import android.Manifest;
+import android.content.Context;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.Shadows;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+import pub.devrel.easypermissions.EasyPermissions;
+
+import static junit.framework.Assert.assertTrue;
+
+/**
+ * Low-API (SDK = 19) tests for {@link pub.devrel.easypermissions.EasyPermissions}.
+ */
+@RunWith(RobolectricTestRunner.class)
+@Config(constants = BuildConfig.class, sdk = 19)
+public class EasyPermissionsLowApiTest {
+
+    private MainActivity mActivity;
+    private ShadowApplication mApplication;
+
+    @Before
+    public void setup() {
+        mActivity = Robolectric.buildActivity(MainActivity.class).get();
+        mApplication = Shadows.shadowOf(mActivity.getApplication());
+    }
+
+    @Test
+    public void testHasPermissions() {
+        Context context = mApplication.getApplicationContext();
+
+        // On low-API devices, we should always get 'true' when we call 'hasPermissions'
+        assertTrue(EasyPermissions.hasPermissions(context,
+                Manifest.permission.ACCESS_COARSE_LOCATION));
+    }
+}

app/src/test/java/pub/devrel/easypermissions/sample/EasyPermissionsTest.java

@@ -0,0 +1,56 @@
+package pub.devrel.easypermissions.sample;
+
+import android.Manifest;
+import android.content.Context;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.Shadows;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadows.ShadowApplication;
+
+import pub.devrel.easypermissions.EasyPermissions;
+
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertTrue;
+
+/**
+ * Basic Robolectric tests for {@link pub.devrel.easypermissions.EasyPermissions}.
+ */
+@RunWith(RobolectricTestRunner.class)
+@Config(constants = BuildConfig.class, sdk = 23)
+public class EasyPermissionsTest {
+
+    private MainActivity mActivity;
+    private ShadowApplication mApplication;
+
+    @Before
+    public void setup() {
+        mActivity = Robolectric.buildActivity(MainActivity.class).get();
+        mApplication = Shadows.shadowOf(mActivity.getApplication());
+    }
+
+    @Test
+    public void testHasPermissions() {
+        Context context = mApplication.getApplicationContext();
+
+        String[] perms = new String[]{
+                Manifest.permission.READ_SMS,
+                Manifest.permission.ACCESS_FINE_LOCATION
+        };
+
+        // Wes should not have permissions before any are granted
+        assertFalse(EasyPermissions.hasPermissions(context, perms));
+
+        // Granting one permission should not make the whole set appear granted
+        mApplication.grantPermissions(perms[0]);
+        assertFalse(EasyPermissions.hasPermissions(context, perms));
+
+        // Granting all permissions should make the whole set granted
+        mApplication.grantPermissions(perms);
+        assertTrue(EasyPermissions.hasPermissions(context, perms));
+    }
+}