feat: step2 구현

core/data/src/main/java/camp/nextstep/edu/github/data/network/GitHubService.kt

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+package camp.nextstep.edu.github.data.network
+
+import camp.nextstep.edu.github.domain.GithubRepository
+import retrofit2.http.GET
+
+interface GitHubService {
+    @GET("/repositories")
+    suspend fun getRepositories(): List<GithubRepository>
+}

core/data/src/main/java/camp/nextstep/edu/github/data/network/GithubRepositoriesDataSource.kt

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+package camp.nextstep.edu.github.data.network
+
+import camp.nextstep.edu.github.domain.GithubRepository
+import camp.nextstep.edu.github.domain.network.GitHubDataSource
+
+internal class GithubRepositoriesDataSource(
+    private val gitHubService: GitHubService
+) : GitHubDataSource {
+    override suspend fun fetchRepositories(): List<GithubRepository> {
+        return gitHubService.getRepositories()
+    }
+}

core/data/src/test/java/camp/nextstep/edu/github/data/network/GithubRepositoriesDataSourceTest.kt

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+package camp.nextstep.edu.github.data.network
+
+import camp.nextstep.edu.github.domain.GithubRepository
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.test.runTest
+import okhttp3.OkHttpClient
+import okhttp3.mockwebserver.MockResponse
+import okhttp3.mockwebserver.MockWebServer
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+import java.io.File
+import java.util.concurrent.TimeUnit
+
+class GithubRepositoriesDataSourceTest {
+    private lateinit var mockWebServer: MockWebServer
+    private lateinit var api: GitHubService
+    private lateinit var dataSource: GithubRepositoriesDataSource
+
+    private val client = OkHttpClient.Builder()
+        .connectTimeout(1, TimeUnit.SECONDS)
+        .readTimeout(1, TimeUnit.SECONDS)
+        .writeTimeout(1, TimeUnit.SECONDS)
+        .build()
+
+    @Before
+    fun setUp() {
+        mockWebServer = MockWebServer()
+    }
+
+    @After
+    fun tearDown() {
+        mockWebServer.shutdown()
+    }
+
+    @Test
+    fun `GitHub repository들을 불러옴`() = runTest {
+        api = Retrofit.Builder()
+            .baseUrl(mockWebServer.url(""))
+            .client(client)
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+            .create(GitHubService::class.java)
+        val body = File("src/test/resources/response.json").readText()
+        val response = MockResponse().setBody(body).setResponseCode(200)
+        mockWebServer.enqueue(response)
+        dataSource = GithubRepositoriesDataSource(api)
+        val actual = dataSource.fetchRepositories()[0]
+        val expected = GithubRepository("nextStep", "android-github")
+        assertThat(actual).isEqualTo(expected)
+    }
+
+    @Test
+    fun `GitHub repository 실제 데이터 체크`() = runTest {
+        api = Retrofit.Builder()
+            .baseUrl(mockWebServer.url("https://api.github.com/"))
+            .client(client)
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+            .create(GitHubService::class.java)
+        dataSource = GithubRepositoriesDataSource(api)
+        val actual = dataSource.fetchRepositories()
+        assertThat(actual).hasSize(100)
+    }
+}

core/data/src/test/resources/response.json

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+[{
+  "full_name": "nextStep",
+  "description": "android-github"
+}]

core/domain/src/main/java/camp/nextstep/edu/github/domain/GithubRepository.kt

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+package camp.nextstep.edu.github.domain
+
+import com.google.gson.annotations.SerializedName
+
+data class GithubRepository(
+    @SerializedName("full_name")
+    val fullName: String,
+    val description: String
+)

core/domain/src/main/java/camp/nextstep/edu/github/domain/network/GitHubDataSource.kt

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+package camp.nextstep.edu.github.domain.network
+
+import camp.nextstep.edu.github.domain.GithubRepository
+
+interface GitHubDataSource {
+    suspend fun fetchRepositories(): List<GithubRepository>
+}