A sample usage of GzipSink & GzipSource from Okio

OkioTest.kt

import okio.GzipSink
import okio.GzipSource
import okio.Okio
import org.assertj.core.api.Assertions.assertThat
import org.junit.Test
import java.io.File

class OkioTest {
    @Test
    fun `should compress file properly`() {
        val zipFile = File("(ʘ‿ʘ).gz")

        // Write & zip the content to the file.
        Okio.sink(zipFile).use { fileSink ->
            Okio.buffer(GzipSink(fileSink)).use { bufferedSink ->
                bufferedSink.writeUtf8("｡◕‿◕｡\n")
                bufferedSink.writeUtf8("ಠoಠ\n")
                bufferedSink.writeUtf8("♥‿♥\n")
            }
        }

        // Decompress the file and read its content.
        val content: String? = GzipSource(Okio.source(zipFile)).use { fileSource ->
            Okio.buffer(fileSource).use { bufferedSource -> bufferedSource.readUtf8() }
        }
        assertThat(content).isEqualTo("｡◕‿◕｡\n" + "ಠoಠ\n" + "♥‿♥\n")
    }
}