JAL-2316 Unit test for download client

diff --git a/test/jalview/ws/UrlDownloadClientTest.java b/test/jalview/ws/UrlDownloadClientTest.java
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+++ b/test/jalview/ws/UrlDownloadClientTest.java
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+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *  
+ * Jalview is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty 
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+ * PURPOSE.  See the GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
+package jalview.ws;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class UrlDownloadClientTest {
+
+  /**
+   * Test that url is successfully loaded into download file
+   */
+  @Test(groups = { "Network" }, enabled = true)
+  public void UrlDownloadTest()
+  {
+    UrlDownloadClient client = new UrlDownloadClient();
+    String urlstring = "http://identifiers.org/rest/collections/";
+    String outfile = "testfile.tmp";
+
+    try
+    {
+      client.download(urlstring, outfile);
+    } catch (IOException e)
+    {
+      Assert.fail("Exception was thrown from UrlDownloadClient download: "
+              + e.getMessage());
+      File f = new File(outfile);
+      if (f.exists())
+      {
+        f.delete();
+      }
+    }
+
+    // download file exists
+    File f = new File(outfile);
+    Assert.assertTrue(f.exists());
+
+    // download file has a believable size
+    // identifiers.org file typically at least 250K
+    Assert.assertTrue(f.length() > 250000);
+
+    if (f.exists())
+    {
+      f.delete();
+    }
+
+  }
+
+  /**
+   * Test that garbage in results in IOException
+   */
+  @Test(
+    groups = { "Network" },
+    enabled = true,
+    expectedExceptions = { IOException.class })
+  public void DownloadGarbageUrlTest() throws IOException
+  {
+    UrlDownloadClient client = new UrlDownloadClient();
+    String urlstring = "identifiers.org/rest/collections/";
+    String outfile = "testfile.tmp";
+
+    client.download(urlstring, outfile);
+  }
+}