Make order of collected files reproducible

The output of the Groovy depends on the order of source files, e.g. when
generating stubs for a class and its superclass, `implements
GroovyObject` will be added to the class only if the superclass hasn't
already been processed. Therefore, this commit orders the files
lexicographically to make the output reproducible.

src/main/java/org/codehaus/gmavenplus/mojo/AbstractGroovySourcesMojo.java

@@ -50,8 +50,8 @@ public abstract class AbstractGroovySourcesMojo extends AbstractGroovyMojo {
      * @param includeJavaSources Whether to include Java sources
      * @return The included files from the specified sources
      */
-    protected Set<File> getFiles(final FileSet[] fromSources, final boolean includeJavaSources) {
-        Set<File> files = new HashSet<File>();
+    protected SortedSet<File> getFiles(final FileSet[] fromSources, final boolean includeJavaSources) {
+        SortedSet<File> files = new TreeSet<File>();
         FileSetManager fileSetManager = new FileSetManager(getLog());
 
         for (FileSet fileSet : getFilesets(fromSources, includeJavaSources)) {
@@ -70,8 +70,8 @@ protected Set<File> getFiles(final FileSet[] fromSources, final boolean includeJ
      * @param includeJavaSources Whether to include Java sources
      * @return The included files from the specified sources
      */
-    protected Set<File> getTestFiles(final FileSet[] fromSources, final boolean includeJavaSources) {
-        Set<File> files = new HashSet<File>();
+    protected SortedSet<File> getTestFiles(final FileSet[] fromSources, final boolean includeJavaSources) {
+        SortedSet<File> files = new TreeSet<File>();
         FileSetManager fileSetManager = new FileSetManager(getLog());
 
         for (FileSet fileSet : getTestFilesets(fromSources, includeJavaSources)) {

src/test/java/org/codehaus/gmavenplus/mojo/CompileMojoTest.java

@@ -31,8 +31,8 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
 import java.util.Set;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -51,7 +51,7 @@ public class CompileMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        Set<File> sources = new HashSet<File>();
+        Set<File> sources = new TreeSet<File>();
         sources.add(mock(File.class));
         doReturn(sources).when(compileMojo).getTestFiles(any(FileSet[].class), eq(false));
         compileMojo.outputDirectory = mock(File.class);

src/test/java/org/codehaus/gmavenplus/mojo/CompileTestsMojoTest.java

@@ -31,8 +31,8 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
 import java.util.Set;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -51,7 +51,7 @@ public class CompileTestsMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        Set<File> sources = new HashSet<File>();
+        Set<File> sources = new TreeSet<File>();
         sources.add(mock(File.class));
         doReturn(sources).when(compileTestsMojo).getTestFiles(any(FileSet[].class), eq(false));
         compileTestsMojo.testOutputDirectory = mock(File.class);

src/test/java/org/codehaus/gmavenplus/mojo/GenerateStubsMojoTest.java

@@ -31,7 +31,7 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -50,8 +50,8 @@ public class GenerateStubsMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        doReturn(new HashSet<File>()).when(generateStubsMojo).getFiles(any(FileSet[].class), eq(false));
-        doReturn(new HashSet<File>()).when(generateStubsMojo).getStubs(any(File.class));
+        doReturn(new TreeSet<File>()).when(generateStubsMojo).getFiles(any(FileSet[].class), eq(false));
+        doReturn(new TreeSet<File>()).when(generateStubsMojo).getStubs(any(File.class));
         generateStubsMojo.project = mock(MavenProject.class);
         generateStubsMojo.stubsOutputDirectory = mock(File.class);
         doReturn(mock(Build.class)).when(generateStubsMojo.project).getBuild();

src/test/java/org/codehaus/gmavenplus/mojo/GenerateTestStubsMojoTest.java

@@ -31,7 +31,7 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -50,8 +50,8 @@ public class GenerateTestStubsMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        doReturn(new HashSet<File>()).when(generateTestStubsMojo).getTestFiles(any(FileSet[].class), eq(false));
-        doReturn(new HashSet<File>()).when(generateTestStubsMojo).getStubs(any(File.class));
+        doReturn(new TreeSet<File>()).when(generateTestStubsMojo).getTestFiles(any(FileSet[].class), eq(false));
+        doReturn(new TreeSet<File>()).when(generateTestStubsMojo).getStubs(any(File.class));
         generateTestStubsMojo.project = mock(MavenProject.class);
         generateTestStubsMojo.testStubsOutputDirectory = mock(File.class);
         doReturn(mock(Build.class)).when(generateTestStubsMojo.project).getBuild();

src/test/java/org/codehaus/gmavenplus/mojo/GroovyDocMojoTest.java

@@ -30,8 +30,8 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
 import java.util.Set;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -50,7 +50,7 @@ public class GroovyDocMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        Set<File> sources = new HashSet<File>();
+        Set<File> sources = new TreeSet<File>();
         sources.add(mock(File.class));
         doReturn(sources).when(groovyDocMojo).getTestFiles(any(FileSet[].class), eq(false));
         groovyDocMojo.groovyDocOutputDirectory = mock(File.class);

src/test/java/org/codehaus/gmavenplus/mojo/GroovyDocTestsMojoTest.java

@@ -30,8 +30,8 @@
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
 import java.net.MalformedURLException;
-import java.util.HashSet;
 import java.util.Set;
+import java.util.TreeSet;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -50,7 +50,7 @@ public class GroovyDocTestsMojoTest {
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
-        Set<File> sources = new HashSet<File>();
+        Set<File> sources = new TreeSet<File>();
         sources.add(mock(File.class));
         doReturn(sources).when(groovyDocTestsMojo).getTestFiles(any(FileSet[].class), eq(false));
         groovyDocTestsMojo.testGroovyDocOutputDirectory = mock(File.class);