add sharedPreferences unit test

Author: jdqm

app/build.gradle

@@ -48,4 +48,6 @@ dependencies {
     testImplementation 'org.powermock:powermock-module-junit4:1.7.4'
 
     testImplementation "org.robolectric:robolectric:3.8"
+    //数据库、SharedPreferences调试，直接在浏览器查看设备数据库、SharedPreferences数据
+    debugImplementation 'com.amitshekhar.android:debug-db:1.0.4'
 }

app/src/androidTest/java/com/jdqm/androidunittest/SharedPreferenceDaoTest.java

@@ -0,0 +1,32 @@
+package com.jdqm.androidunittest;
+
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Created by Jdqm on 2018-7-17.
+ */
+// @RunWith 只在混合使用 JUnit3 和 JUnit4 需要，若只使用JUnit4，可省略
+@RunWith(AndroidJUnit4.class)
+public class SharedPreferenceDaoTest {
+
+    public static final String TEST_KEY = "instrumentedTest";
+    public static final String TEST_STRING = "玉刚说";
+
+    SharedPreferenceDao spDao;
+
+    @Before
+    public void setUp() {
+        spDao = new SharedPreferenceDao(App.getContext());
+    }
+
+    @Test
+    public void sharedPreferenceDaoWriteRead() {
+        spDao.put(TEST_KEY, TEST_STRING);
+        Assert.assertEquals(TEST_STRING, spDao.get(TEST_KEY));
+    }
+}

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     package="com.jdqm.androidunittest">
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"

app/src/main/java/com/jdqm/androidunittest/App.java

@@ -0,0 +1,21 @@
+package com.jdqm.androidunittest;
+
+import android.app.Application;
+import android.content.Context;
+
+/**
+ * Created by Jdqm on 2018-7-17.
+ */
+public class App extends Application {
+    private static Context context;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        context = this;
+    }
+
+    public static Context getContext() {
+        return context;
+    }
+}

app/src/main/java/com/jdqm/androidunittest/SharedPreferenceDao.java

@@ -0,0 +1,29 @@
+package com.jdqm.androidunittest;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+/**
+ * Created by Jdqm on 2018-7-17.
+ */
+public class SharedPreferenceDao {
+    private SharedPreferences sp;
+
+    public SharedPreferenceDao(SharedPreferences sp) {
+        this.sp = sp;
+    }
+
+    public SharedPreferenceDao(Context context) {
+        this(context.getSharedPreferences("config", Context.MODE_PRIVATE));
+    }
+
+    public void put(String key, String value) {
+        SharedPreferences.Editor editor = sp.edit();
+        editor.putString(key, value);
+        editor.apply();
+    }
+
+    public String get(String key) {
+        return sp.getString(key, null);
+    }
+}

app/src/test/java/com/jdqm/androidunittest/RoboApp.java

@@ -0,0 +1,10 @@
+package com.jdqm.androidunittest;
+
+import android.app.Application;
+
+/**
+ * Created by yangsheng on 2018-7-17.
+ */
+public class RoboApp extends Application {
+
+}

app/src/test/java/com/jdqm/androidunittest/SharedPreferenceDaoTest.java

@@ -0,0 +1,36 @@
+package com.jdqm.androidunittest;
+
+import android.os.Environment;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+/**
+ * Created by yangsheng on 2018-7-17.
+ */
+@RunWith(RobolectricTestRunner.class)
+@Config(application = RoboApp.class)
+public class SharedPreferenceDaoTest {
+
+    public static final String TEST_KEY = "instrumentedTest";
+    public static final String TEST_STRING = "玉刚说";
+
+    SharedPreferenceDao spDao;
+
+    @Before
+    public void setUp() {
+        spDao = new SharedPreferenceDao(RuntimeEnvironment.application);
+    }
+
+    @Test
+    public void sharedPreferenceDaoWriteRead() {
+        spDao.put(TEST_KEY, TEST_STRING);
+        Assert.assertEquals(TEST_STRING, spDao.get(TEST_KEY));
+    }
+
+}