Remove placeholder tests

app/build.gradle

@@ -117,6 +117,5 @@ dependencies {
         transitive = true
     }
     implementation 'com.google.code.gson:gson:2.8.2'
-    testImplementation 'junit:junit:4.12'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
 }

app/src/androidTest/java/com/kabouzeid/gramophone/ApplicationTest.java

@@ -1,13 +0,0 @@
-package com.kabouzeid.gramophone;
-
-import android.app.Application;
-import android.test.ApplicationTestCase;
-
-/**
- * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
- */
-public class ApplicationTest extends ApplicationTestCase<Application> {
-    public ApplicationTest() {
-        super(Application.class);
-    }
-}

app/src/test/java/com/kabouzeid/gramophone/ExampleUnitTest.java

@@ -1,15 +0,0 @@
-package com.kabouzeid.gramophone;
-
-import org.junit.Test;
-
-import static org.junit.Assert.assertEquals;
-
-/**
- * To work on unit tests, switch the Test Artifact in the Build Variants view.
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() throws Exception {
-        assertEquals(4, 2 + 2);
-    }
-}