Robolectric tests are not working with double-espresso due to it not excluding espresso files. This snippet allows you to exclude Espresso resources when running Robolectric tests. More info can be found here: http://stackoverflow.com/a/24706452/413254

build.gradle

/** Hook into existing tasks. */
tasks.whenTaskAdded { theTask ->
    excludeEspressoFilesIfNecessary(theTask)
}

/**
 * This excludes Espresso tests from Robolectric. http://stackoverflow.com/a/24706452/413254
 *
 * This was needed when using double-espresso.  I couldn't get Robolectric to exclude them
 * normally unless doing this. Double-espresso is used to fix a conflicting Dagger 1.2 dependency
 * with Espresso.
 *
 * Android Testing. (╯°□°）╯︵ ┻━┻
 */
def excludeEspressoFilesIfNecessary(theTask) {
    
    // Modify these if needed.
    def final TEST_SRC_DIR = 'src/test/java'
    def final TO_EXCLUDE = '**/espresso/**/*.java'
    
    def final compileTestPattern= /compileTest([^ ]*)Java/
    if (theTask.name.matches(compileTestPattern)) { // find all task names.

        // Grabs the name of the variant to use when naming the new task.
        def matcher = (theTask.name =~ compileTestPattern)
        def cleanupTaskName = "touchUp${matcher[0][1]}RobolectricSourceSet"

        // Exclude espresso and add the task as a dependency.
        project.task(cleanupTaskName) << {
            def FileTree tree = fileTree(dir: TEST_SRC_DIR)
            tree.exclude TO_EXCLUDE 
            theTask.source = tree
        }
        theTask.dependsOn(cleanupTaskName)
    }
}

From http://stackoverflow.com/a/24706452/413254 and modified to handle variants (flavors).

line 30: should be
def FileTree tree = fileTree(dir: TEST_SRC_DIR)
otherwise gradle 2.1 gets confused

@asherf, I updated. Thanks!