CommandLineTest: Add runArduino helper

This abstracts some the common code (running Arduino, copying
output, waiting for completion, checking result) from all testcases into
a single method. This simplifies each testcase, but also prepares for
adding more common arguments to all runs in a subsequent commit.

app/test/processing/app/CommandLineTest.java

@@ -32,6 +32,10 @@ package processing.app;
 import static org.junit.Assert.*;
 
 import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
 
 import org.apache.commons.compress.utils.IOUtils;
 import org.fest.assertions.Assertions;
@@ -72,58 +76,57 @@ public class CommandLineTest {
     System.out.println("found arduino: " + arduinoPath);
   }
 
+  public Process runArduino(boolean output, boolean success, File wd, String[] extraArgs) throws IOException, InterruptedException {
+    Runtime rt = Runtime.getRuntime();
+
+    List<String> args = new ArrayList<String>();
+    args.add(arduinoPath.getAbsolutePath());
+    args.addAll(Arrays.asList(extraArgs));
+
+    Process pr = rt.exec(args.toArray(new String[0]), null, wd);
+    if (output) {
+      IOUtils.copy(pr.getInputStream(), System.out);
+      IOUtils.copy(pr.getErrorStream(), System.out);
+    }
+    pr.waitFor();
+    if (success)
+      assertEquals(0, pr.exitValue());
+    return pr;
+  }
+
   @Test
   public void testCommandLineBuildWithRelativePath() throws Exception {
-    Runtime rt = Runtime.getRuntime();
     File wd = new File(buildPath, "build/shared/examples/01.Basics/Blink/");
-    Process pr = rt
+    runArduino(true, true, wd, new String[] {
-        .exec(arduinoPath + " --board arduino:avr:uno --verify Blink.ino", null,
+        "--board", "arduino:avr:uno",
-              wd);
+        "--verify", "Blink.ino",
-    IOUtils.copy(pr.getInputStream(), System.out);
+    });
-    pr.waitFor();
-    assertEquals(0, pr.exitValue());
   }
 
   @Test
   public void testCommandLinePreferencesSave() throws Exception {
-    Runtime rt = Runtime.getRuntime();
     File prefFile = File.createTempFile("test_pref", ".txt");
     prefFile.deleteOnExit();
 
-    Process pr = rt.exec(new String[] {
+    runArduino(true, true, null, new String[] {
-        arduinoPath.getAbsolutePath(),
         "--save-prefs",
         "--preferences-file", prefFile.getAbsolutePath(),
         "--get-pref", // avoids starting the GUI
     });
-    IOUtils.copy(pr.getInputStream(), System.out);
-    IOUtils.copy(pr.getErrorStream(), System.out);
-    pr.waitFor();
-    assertEquals(0, pr.exitValue());
 
-    pr = rt.exec(new String[] {
+    runArduino(true, true, null, new String[] {
-        arduinoPath.getAbsolutePath(),
         "--pref", "test_pref=xxx",
         "--preferences-file", prefFile.getAbsolutePath(),
     });
-    IOUtils.copy(pr.getInputStream(), System.out);
-    IOUtils.copy(pr.getErrorStream(), System.out);
-    pr.waitFor();
-    assertEquals(0, pr.exitValue());
 
     PreferencesMap prefs = new PreferencesMap(prefFile);
     assertNull("preference should not be saved", prefs.get("test_pref"));
 
-    pr = rt.exec(new String[] {
+    runArduino(true, true, null, new String[] {
-        arduinoPath.getAbsolutePath(),
         "--pref", "test_pref=xxx",
         "--preferences-file", prefFile.getAbsolutePath(),
         "--save-prefs",
     });
-    IOUtils.copy(pr.getInputStream(), System.out);
-    IOUtils.copy(pr.getErrorStream(), System.out);
-    pr.waitFor();
-    assertEquals(0, pr.exitValue());
 
     prefs = new PreferencesMap(prefFile);
     assertEquals("preference should be saved", "xxx", prefs.get("test_pref"));
@@ -131,29 +134,20 @@ public class CommandLineTest {
 
   @Test
   public void testCommandLineVersion() throws Exception {
-    Runtime rt = Runtime.getRuntime();
+    Process pr = runArduino(false, true, null, new String[] {
-    Process pr = rt.exec(new String[]{
-      arduinoPath.getAbsolutePath(),
       "--version",
     });
-    pr.waitFor();
 
-    Assertions.assertThat(pr.exitValue())
-        .as("Process will finish with exit code 0 in --version")
-        .isEqualTo(0);
     Assertions.assertThat(new String(IOUtils.toByteArray(pr.getInputStream())))
         .matches("Arduino: \\d+\\.\\d+\\.\\d+.*\r?\n");
   }
 
   @Test
   public void testCommandLineMultipleAction() throws Exception {
-    Runtime rt = Runtime.getRuntime();
+    Process pr = runArduino(true, false, null, new String[] {
-    Process pr = rt.exec(new String[]{
-      arduinoPath.getAbsolutePath(),
       "--version",
       "--verify",
     });
-    pr.waitFor();
 
     Assertions.assertThat(pr.exitValue())
         .as("Multiple Action will be rejected")