Add test for UpdateTextAreaAction (related to issue #8055)

Also, introduce 3 new dependencies for testing scope only.
Testing dynamic behavior with Mockito library enables better test coverage

Author: nitram509

.classpath

@@ -11,6 +11,9 @@
 	<classpathentry kind="lib" path="app/test-lib/fest-swing-1.2.jar"/>
 	<classpathentry kind="lib" path="app/test-lib/fest-util-1.1.2.jar"/>
 	<classpathentry kind="lib" path="app/test-lib/jcip-annotations-1.0.jar"/>
+	<classpathentry kind="lib" path="app/test-lib/mockito-core-2.23.0.jar"/>
+	<classpathentry kind="lib" path="app/test-lib/byte-buddy-1.9.1.jar"/>
+	<classpathentry kind="lib" path="app/test-lib/objenesis-3.0.jar"/>
 	<classpathentry kind="lib" path="app/lib/commons-codec-1.7.jar"/>
 	<classpathentry kind="lib" path="app/lib/commons-exec-1.1.jar"/>
 	<classpathentry kind="lib" path="app/lib/commons-httpclient-3.1.jar"/>

app/.classpath

@@ -53,4 +53,7 @@
 	<classpathentry kind="lib" path="test-lib/fest-swing-1.2.jar"/>
 	<classpathentry kind="lib" path="test-lib/fest-util-1.1.2.jar"/>
 	<classpathentry kind="lib" path="test-lib/jcip-annotations-1.0.jar"/>
+	<classpathentry kind="lib" path="test-lib/mockito-core-2.23.0.jar"/>
+	<classpathentry kind="lib" path="test-lib/byte-buddy-1.9.1.jar"/>
+	<classpathentry kind="lib" path="test-lib/objenesis-3.0.jar"/>
 </classpath>

app/test-lib/byte-buddy-1.9.1.jar

@@ -0,0 +1,67 @@
+package processing.app;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+
+import static org.fest.assertions.Assertions.assertThat;
+import static org.mockito.Mockito.*;
+
+public class UpdateTextAreaActionTest {
+
+  private static final String TIMESTAMP_REGEX = "\\d\\d:\\d\\d:\\d\\d.\\d\\d\\d";
+  private TextAreaFIFO textAreaFIFO;
+  private ArgumentCaptor<String> text;
+
+  @Before public void setUp() {
+    textAreaFIFO = mock(TextAreaFIFO.class);
+    text = ArgumentCaptor.forClass(String.class);
+  }
+
+  @Test
+  public void noTimestampAdded() {
+    // given
+    AbstractTextMonitor.UpdateTextAreaAction action = new AbstractTextMonitor.UpdateTextAreaAction(
+        textAreaFIFO, false, false, "line1\nline2\r\nline3");
+
+    // when
+    action.run();
+
+    //then
+    verify(textAreaFIFO, atLeastOnce()).append(text.capture());
+    assertThat(text.getValue()).startsWith("line1");
+  }
+
+  @Test
+  public void all3LinesHaveTimestampAdded() {
+    // given
+    AbstractTextMonitor.UpdateTextAreaAction action = new AbstractTextMonitor.UpdateTextAreaAction(
+        textAreaFIFO, true, false, "line1\nline2\r\nline3");
+
+    // when
+    action.run();
+
+    //then
+    verify(textAreaFIFO, atLeastOnce()).append(text.capture());
+    assertThat(text.getValue()).matches(TIMESTAMP_REGEX + " -> line1\\n"
+                                        + TIMESTAMP_REGEX + " -> line2\\r\\n"
+                                        + TIMESTAMP_REGEX + " -> line3");
+  }
+
+  @Test
+  public void emptyLinesHaveTimestampToo() {
+    // given
+    AbstractTextMonitor.UpdateTextAreaAction action = new AbstractTextMonitor.UpdateTextAreaAction(
+        textAreaFIFO, true, false, "line_1\n\nline_2");
+
+    // when
+    action.run();
+
+    //then
+    verify(textAreaFIFO, atLeastOnce()).append(text.capture());
+    assertThat(text.getValue()).matches(TIMESTAMP_REGEX + " -> line_1\\n"
+                                        + TIMESTAMP_REGEX + " -> \\n"
+                                        + TIMESTAMP_REGEX + " -> line_2");
+  }
+
+}