Introduce instrumentation tests

app/test/src/main/AndroidManifest.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission tools:node="removeAll" />
+
+    <application tools:node="replace">
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation
+        android:name="androidx.test.runner.AndroidJUnitRunner"
+        android:targetPackage="com.topjohnwu.magisk"
+        android:label="Tests for Magisk" />
+
+</manifest>

app/test/src/main/java/com/topjohnwu/magisk/test/Environment.kt

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+package com.topjohnwu.magisk.test
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.topjohnwu.magisk.core.TestImpl
+import org.junit.BeforeClass
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class Environment {
+
+    companion object {
+        @BeforeClass
+        @JvmStatic
+        fun before() {
+            TestImpl.before()
+        }
+    }
+
+    @Test
+    fun setupMagisk() {
+        TestImpl.setupMagisk()
+    }
+
+    @Test
+    fun setupShellGrantTest() {
+        TestImpl.setupShellGrantTest()
+    }
+}

app/test/src/main/java/com/topjohnwu/magisk/test/MagiskAppTest.kt

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+package com.topjohnwu.magisk.test
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.topjohnwu.magisk.core.TestImpl
+import org.junit.BeforeClass
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class MagiskAppTest {
+
+    companion object {
+        @BeforeClass
+        @JvmStatic
+        fun before() {
+            TestImpl.before()
+        }
+    }
+
+    @Test
+    fun testZygisk() {
+        TestImpl.testZygisk()
+    }
+}