Add a sample for #453

Author: seratch

slack-api-client/src/test/java/test_with_remote_apis/methods/samples/Issue453_DownloadingFiles_Test.java

@@ -0,0 +1,46 @@
+package test_with_remote_apis.methods.samples;
+
+import com.slack.api.Slack;
+import com.slack.api.methods.response.files.FilesUploadResponse;
+import config.Constants;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.junit.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import static java.util.stream.Collectors.joining;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * For https://github.com/slackapi/java-slack-sdk/issues/453
+ */
+public class Issue453_DownloadingFiles_Test {
+
+    @Test
+    public void sample() throws Exception {
+        Slack slack = Slack.getInstance();
+        String token = System.getenv(Constants.SLACK_SDK_TEST_BOT_TOKEN);
+        FilesUploadResponse uploadResult = slack.methods(token)
+                .filesUpload(r -> r.content("This is a file!").filename("sample.txt"));
+
+        OkHttpClient okHttpClient = new OkHttpClient();
+        Request request = new Request.Builder()
+                .get()
+                .url(uploadResult.getFile().getUrlPrivateDownload())
+                .header("Authorization", "Bearer " + token)
+                .build();
+        Response response = okHttpClient.newCall(request).execute();
+
+        // You can find the file at slack-api-client/target/sample.txt
+        Path localFilepath = Paths.get("target/sample.txt");
+        Files.write(localFilepath, response.body().bytes());
+
+        String body = Files.readAllLines(localFilepath).stream().collect(joining());
+        assertThat(body, is("This is a file!"));
+    }
+}