From 4f4388b04ede9ec9eb3c90aae574674fe9d2b8d3 Mon Sep 17 00:00:00 2001
From: Yusuke Matsubara <whym@whym.org>
Date: Sat, 10 Jun 2017 17:28:14 +0900
Subject: [PATCH] Add test for FileUtils

---
 .../fr/free/nrw/commons/FileUtilsTest.java    | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 app/src/test/java/fr/free/nrw/commons/FileUtilsTest.java

diff --git a/app/src/test/java/fr/free/nrw/commons/FileUtilsTest.java b/app/src/test/java/fr/free/nrw/commons/FileUtilsTest.java
new file mode 100644
index 000000000..c6febc1e4
--- /dev/null
+++ b/app/src/test/java/fr/free/nrw/commons/FileUtilsTest.java
@@ -0,0 +1,40 @@
+package fr.free.nrw.commons;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+import fr.free.nrw.commons.upload.FileUtils;
+
+import static org.hamcrest.CoreMatchers.is;
+
+public class FileUtilsTest {
+    @Test public void copiedFileIsIdenticalToSource() throws IOException {
+        File source = File.createTempFile("temp", "");
+        File dest = File.createTempFile("temp", "");
+        writeToFile(source, "Hello, World");
+        FileUtils.copy(new FileInputStream(source), new FileOutputStream(dest));
+        Assert.assertThat(getString(dest), is(getString(source)));
+    }
+
+    private static void writeToFile(File file, String s) throws IOException {
+        BufferedOutputStream buf = new BufferedOutputStream(new FileOutputStream(file));
+        buf.write(s.getBytes());
+        buf.close();
+    }
+
+    private static String getString(File file) throws IOException {
+        int size = (int) file.length();
+        byte[] bytes = new byte[size];
+        BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file));
+        buf.read(bytes, 0, bytes.length);
+        buf.close();
+        return new String(bytes);
+    }
+}