FoodiumServiceTest.kt

/*
 * MIT License
 *
 * Copyright (c) 2020 Shreyas Patil
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package dev.shreyaspatil.foodium.data.remote.api

import androidx.arch.core.executor.testing.InstantTaskExecutorRule
import com.squareup.moshi.Moshi
import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
import kotlinx.coroutines.runBlocking
import okhttp3.mockwebserver.MockResponse
import okhttp3.mockwebserver.MockWebServer
import okio.buffer
import okio.source
import org.hamcrest.CoreMatchers.`is`
import org.hamcrest.core.IsNull.notNullValue
import org.junit.After
import org.junit.Assert.assertThat
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import retrofit2.Retrofit
import retrofit2.converter.moshi.MoshiConverterFactory

@RunWith(JUnit4::class)
class FoodiumServiceTest {
    @Rule
    @JvmField
    val instantExecutorRule = InstantTaskExecutorRule()

    private lateinit var service: FoodiumService

    private lateinit var mockWebServer: MockWebServer

    @Before
    fun createService() {
        mockWebServer = MockWebServer()
        service = Retrofit.Builder()
            .baseUrl(mockWebServer.url("/"))
            .addConverterFactory(
                MoshiConverterFactory.create(
                    Moshi.Builder().add(KotlinJsonAdapterFactory()).build()
                )
            )
            .build()
            .create(FoodiumService::class.java)
    }

    @After
    fun stopService() {
        mockWebServer.shutdown()
    }

    @Test
    fun getPostsTest() = runBlocking {
        enqueueResponse("posts.json")
        val posts = service.getPosts().body()

        assertThat(posts, notNullValue())
        assertThat(posts!!.size, `is`(2))
        assertThat(posts[0].title, `is`("Title 1"))
    }

    private fun enqueueResponse(fileName: String, headers: Map<String, String> = emptyMap()) {
        val inputStream = javaClass.classLoader!!
            .getResourceAsStream("api-response/$fileName")
        val source = inputStream.source().buffer()
        val mockResponse = MockResponse()
        for ((key, value) in headers) {
            mockResponse.addHeader(key, value)
        }
        mockWebServer.enqueue(
            mockResponse
                .setBody(source.readString(Charsets.UTF_8))
        )
    }
}