public void DiffCleanupEfficiencyTest()
{
diff_match_patchTest dmp = new diff_match_patchTest();
// Cleanup operationally trivial equalities.
dmp.Diff_EditCost = 4;
// Null case.
List<Diff> diffs = new List<Diff> ();
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff>(), diffs);
// No elimination.
diffs = new List<Diff> {
new Diff(Operation.DELETE, "ab"),
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "wxyz"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "34")};
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff> {
new Diff(Operation.DELETE, "ab"),
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "wxyz"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "34")}, diffs);
// Four-edit elimination.
diffs = new List<Diff> {
new Diff(Operation.DELETE, "ab"),
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "xyz"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "34")};
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff> {
new Diff(Operation.DELETE, "abxyzcd"),
new Diff(Operation.INSERT, "12xyz34")}, diffs);
// Three-edit elimination.
diffs = new List<Diff> {
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "x"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "34")};
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff> {
new Diff(Operation.DELETE, "xcd"),
new Diff(Operation.INSERT, "12x34")}, diffs);
// Backpass elimination.
diffs = new List<Diff> {
new Diff(Operation.DELETE, "ab"),
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "xy"),
new Diff(Operation.INSERT, "34"),
new Diff(Operation.EQUAL, "z"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "56")};
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff> {
new Diff(Operation.DELETE, "abxyzcd"),
new Diff(Operation.INSERT, "12xy34z56")}, diffs);
// High cost elimination.
dmp.Diff_EditCost = 5;
diffs = new List<Diff> {
new Diff(Operation.DELETE, "ab"),
new Diff(Operation.INSERT, "12"),
new Diff(Operation.EQUAL, "wxyz"),
new Diff(Operation.DELETE, "cd"),
new Diff(Operation.INSERT, "34")};
dmp.DiffCleanupEfficiency(diffs);
CollectionAssert.AreEqual(new List<Diff> {
new Diff(Operation.DELETE, "abwxyzcd"),
new Diff(Operation.INSERT, "12wxyz34")}, diffs);
dmp.Diff_EditCost = 4;
}