Added test for command line regression

See arduino#5836

app/test/processing/app/CommandLineTest.java

@@ -0,0 +1,85 @@
+/*
+ * This file is part of Arduino.
+ *
+ * Copyright 2017 Arduino LLC (http://www.arduino.cc/)
+ *
+ * Arduino 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ */
+
+package processing.app;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+
+import org.apache.commons.compress.utils.IOUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+import processing.app.helpers.OSUtils;
+
+public class CommandLineTest {
+
+  File buildPath;
+  File arduinoPath;
+
+  @Before
+  public void findBuildPaths() throws Exception {
+    buildPath = new File(System.getProperty("user.dir"));
+    while (!new File(buildPath, "build").isDirectory()) {
+      buildPath = buildPath.getParentFile();
+      if (buildPath == null) {
+        throw new Exception("Could not determine build path");
+      }
+    }
+    System.out.println("found buildpath: " + buildPath);
+    if (OSUtils.isLinux()) {
+      arduinoPath = new File(buildPath, "build/linux/work/arduino");
+    }
+    if (OSUtils.isWindows()) {
+      arduinoPath = new File(buildPath, "build/windows/work/arduino");
+    }
+    if (OSUtils.isMacOS()) {
+      arduinoPath = new File(buildPath,
+          "build/macosx/work/Arduino.app/Contents/MacOS/Arduino");
+    }
+    if (!arduinoPath.canExecute()) {
+      throw new Exception("Could not determine arduino location");
+    }
+    System.out.println("found arduino: " + arduinoPath);
+  }
+
+  @Test
+  public void testCommandLineBuildWithRelativePath() throws Exception {
+    Runtime rt = Runtime.getRuntime();
+    File wd = new File(buildPath, "build/shared/examples/01.Basics/Blink/");
+    Process pr = rt
+        .exec(arduinoPath + " --board arduino:avr:uno --verify Blink.ino", null,
+              wd);
+    IOUtils.copy(pr.getInputStream(), System.out);
+    pr.waitFor();
+    assertEquals(0, pr.exitValue());
+  }
+
+}