Refactor out preproc.issue.

Removed the preproc.issue package by relocating supporting classes for PreprocessIssueMessageSimplifier and PdeIssueEmitter as inner classes. This assists with https://github.com/processing/processing4/issues/10.

java/test/processing/mode/java/preproc/MissingMethodNameMessageSimplifierStrategyTest.java

@@ -0,0 +1,45 @@
+package processing.mode.java.preproc;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import processing.mode.java.preproc.PdeIssueEmitter;
+import processing.mode.java.preproc.PreprocessIssueMessageSimplifier;
+
+import java.util.Optional;
+
+
+public class MissingMethodNameMessageSimplifierStrategyTest {
+
+  private PreprocessIssueMessageSimplifier.PreprocIssueMessageSimplifierStrategy strategy;
+
+  @Before
+  public void setup() {
+    strategy = PreprocessIssueMessageSimplifier.get().createMethodMissingNameStrategy();
+  }
+
+  @Test
+  public void testPresent() {
+    Optional<PdeIssueEmitter.IssueMessageSimplification> msg = strategy.simplify("void (int x) \n{");
+    Assert.assertTrue(msg.isPresent());
+  }
+
+  @Test
+  public void testPresentNoSpace() {
+    Optional<PdeIssueEmitter.IssueMessageSimplification> msg = strategy.simplify("test(int x) \n{");
+    Assert.assertTrue(msg.isPresent());
+  }
+
+  @Test
+  public void testPresentUnderscore() {
+    Optional<PdeIssueEmitter.IssueMessageSimplification> msg = strategy.simplify("void (int x_y) \n{");
+    Assert.assertTrue(msg.isPresent());
+  }
+
+  @Test
+  public void testNotPresent() {
+    Optional<PdeIssueEmitter.IssueMessageSimplification> msg = strategy.simplify("int x = y");
+    Assert.assertTrue(msg.isEmpty());
+  }
+
+}