working on #223: Auto-detection of serial ports. Mac version ready even if a bit slow

app/test/processing/app/TestHelper.java

@@ -0,0 +1,21 @@
+package processing.app;
+
+import java.io.*;
+
+public class TestHelper {
+
+  public static String inputStreamToString(InputStream is) throws IOException {
+    StringWriter sw = new StringWriter();
+
+    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
+    String line;
+    try {
+      while ((line = reader.readLine()) != null) {
+        sw.append(line).append('\n');
+      }
+      return sw.toString();
+    } finally {
+      is.close();
+    }
+  }
+}