included some more tests

java-diff-utils/src/test/java/com/github/difflib/patch/PatchWithMeyerDiffTest.java

@@ -16,8 +16,10 @@
 package com.github.difflib.patch;
 
 import com.github.difflib.DiffUtils;
+import static com.github.difflib.patch.Patch.CONFLICT_PRODUCES_MERGE_CONFLICT;
 import java.util.Arrays;
 import java.util.List;
+import static java.util.stream.Collectors.joining;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.fail;
 import org.junit.jupiter.api.Test;
@@ -27,6 +29,7 @@
  * @author tw
  */
 public class PatchWithMeyerDiffTest {
+
     @Test
     public void testPatch_Change_withExceptionProcessor() {
         final List<String> changeTest_from = Arrays.asList("aaa", "bbb", "ccc", "ddd");
@@ -48,4 +51,18 @@ public void testPatch_Change_withExceptionProcessor() {
             fail(e.getMessage());
         }
     }
+
+    @Test
+    public void testPatchThreeWayIssue138() throws PatchFailedException {
+        List<String> base = Arrays.asList("Imagine there's no heaven".split("\\s+"));
+        List<String> left = Arrays.asList("Imagine there's no HEAVEN".split("\\s+"));
+        List<String> right = Arrays.asList("IMAGINE there's no heaven".split("\\s+"));
+
+        Patch<String> rightPatch = DiffUtils.diff(base, right)
+                .withConflictOutput(CONFLICT_PRODUCES_MERGE_CONFLICT);
+
+        List<String> applied = rightPatch.applyTo(left);
+
+        assertEquals("IMAGINE there's no HEAVEN", applied.stream().collect(joining(" ")));
+    }
 }

java-diff-utils/src/test/java/com/github/difflib/text/DiffRowGeneratorTest.java

@@ -761,4 +761,28 @@ public void testIssue129SkipDeltaDecompression() {
 
         assertThat(txt).isEqualTo("EQUAL EQUAL EQUAL CHANGE CHANGE CHANGE EQUAL EQUAL EQUAL");
     }
+
+    @Test
+    public void testIssue129SkipWhitespaceChanges() throws IOException {
+        String original = Files.lines(Paths.get("target/test-classes/com/github/difflib/text/issue129_1.txt")).collect(joining("\n"));
+        String revised = Files.lines(Paths.get("target/test-classes/com/github/difflib/text/issue129_2.txt")).collect(joining("\n"));
+
+        DiffRowGenerator generator = DiffRowGenerator.create()
+                .showInlineDiffs(true)
+                .mergeOriginalRevised(true)
+                .inlineDiffByWord(true)
+                .ignoreWhiteSpaces(true)
+                .oldTag((tag, isOpening) -> isOpening ? "==old" + tag + "==>" : "<==old==")
+                .newTag((tag, isOpening) -> isOpening ? "==new" + tag + "==>" : "<==new==")
+                .build();
+        List<DiffRow> rows = generator.generateDiffRows(
+                Arrays.asList(original.split("\n")),
+                Arrays.asList(revised.split("\n")));
+
+        assertThat(rows).hasSize(13);
+
+        rows.stream()
+                .filter(item -> item.getTag() != DiffRow.Tag.EQUAL)
+                .forEach(System.out::println);
+    }
 }

java-diff-utils/src/test/resources/com/github/difflib/text/issue129_1.txt

@@ -0,0 +1,12 @@
+Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated
+to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation, or
+any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that war. We have come to
+dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live.
+It is altogether fitting and proper that we should do this.  But, in a larger sense, we can not dedicate -- we can not
+consecrate -- we can not hallow -- this ground. The brave men, living and dead, who struggled here, have consecrated it,
+far above our poor power to add or detract. The world will little note, nor long remember what we say here, but it can never
+forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought
+here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us -- that
+from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion -- that
+we here highly resolve that these dead shall not have died in vain -- that this nation, under God, shall have a new birth of
+freedom -- and that government of the people, by the people, for the people, shall not perish from the earth.

java-diff-utils/src/test/resources/com/github/difflib/text/issue129_2.txt

@@ -0,0 +1,13 @@
+Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and
+dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether
+that nation, or any nation so conceived and so dedicated, can long endure. We are met on a great battle-field of that
+war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives
+that that nation might live. It is altogether fitting and proper that we should do this.  But, in a larger sense, we
+can not dedicate -- we can not consecrate -- we can not hallow -- this ground. The brave men, living and dead, who
+struggled here, have consecrated it, far above our poor power to add or detract. The world will little note, nor long
+remember what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated
+here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here
+dedicated to the great task remaining before us -- that from these honored dead we take increased devotion to that cause
+for which they gave the last full measure of devotion -- that we here highly resolve that these dead shall not have died
+in vain -- that this nation, under God, shall have a new birth of freedom -- and that government of the people, by the
+people, for the people, shall not perish from the earth.