Add Content Provider backed by Room Database

<?xml version="1.0" encoding="UTF-8"?>

<project version="4">

  <component name="GradleMigrationSettings" migrationVersion="1" />

  <component name="GradleSettings">

    <option name="linkedExternalProjectsSettings">

      <GradleProjectSettings>

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'kotlin-kapt'

android {

    compileSdkVersion 29

    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

    implementation 'androidx.core:core-ktx:1.3.0'

    implementation 'androidx.appcompat:appcompat:1.1.0'

    def room_version = "2.2.5"

    implementation "androidx.room:room-runtime:$room_version"

    kapt "androidx.room:room-compiler:$room_version"

    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'androidx.test:core:1.2.0'

    androidTestImplementation 'androidx.test.ext:junit:1.1.1'

    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

package foundation.e.pwaplayer

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("foundation.e.pwaplayer", appContext.packageName)

    }

}

 No newline at end of file

package foundation.e.pwaplayer.database

import androidx.room.Room

import androidx.test.core.app.ApplicationProvider

import androidx.test.ext.junit.runners.AndroidJUnit4

import androidx.test.filters.SmallTest

import org.hamcrest.Matchers.`is`

import org.junit.After

import org.junit.Assert.assertThat

import org.junit.Before

import org.junit.Test

import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)

@SmallTest

class PwaTest {

    private lateinit var database: PwaDatabase

    @Before

    fun createDatabase() {

        database = Room.inMemoryDatabaseBuilder(

            ApplicationProvider.getApplicationContext(),

            PwaDatabase::class.java

        ).build()

    }

    @After

    fun closeDatabase() {

        database.close()

    }

    @Test

    fun insertAndCount() {

        assertThat(database.pwaDao().count(), `is`(0))

        val pwa = Pwa(shortcutId = "test-shortcut", url = "https://e.foundation")

        database.pwaDao().insert(pwa)

        assertThat(database.pwaDao().count(), `is`(1))

    }

}

 No newline at end of file

package foundation.e.pwaplayer.provider

import android.content.ContentResolver

import android.content.Context

import android.database.Cursor

import androidx.test.core.app.ApplicationProvider

import androidx.test.ext.junit.runners.AndroidJUnit4

import androidx.test.filters.SmallTest

import org.hamcrest.CoreMatchers.notNullValue

import org.hamcrest.Matchers.`is`

import org.junit.Assert.assertThat

import org.junit.Before

import org.junit.Test

import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)

@SmallTest

class PwaProviderTest {

    private lateinit var contentResolver: ContentResolver

    @Before

    fun setUp() {

        val context: Context = ApplicationProvider.getApplicationContext()

        //SampleDatabase.switchToInMemory(context)

        contentResolver = context.contentResolver

    }

    @Test

    fun cheese_initiallyEmpty() {

        val cursor: Cursor? = contentResolver.query(

            URI_PWA,

            arrayOf<String>("url"),

            null,

            null,

            null

        )

        assertThat(cursor, notNullValue())

        assertThat(cursor!!.count, `is`(0))

        cursor!!.close()

    }

}

 No newline at end of file