remove placeholder files

app/src/androidTest/java/it/unisannio/ding/ids/wedroid/app/ExampleInstrumentedTest.kt

@@ -1,24 +0,0 @@
-package it.unisannio.ding.ids.wedroid.app
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("it.unisannio.ding.ids.wedroid.app", appContext.packageName)
-    }
-}

app/src/test/java/it/unisannio/ding/ids/wedroid/app/ExampleUnitTest.kt

@@ -1,17 +0,0 @@
-package it.unisannio.ding.ids.wedroid.app
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}