for result in diff::lines(expected, actual) {
match result {
diff::Result::Left(str) => {
- if lines_since_mismatch >= context_size {
+ if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
results.push(mismatch);
mismatch = Mismatch::new(line_number - context_queue.len() as u32);
}
lines_since_mismatch = 0;
}
diff::Result::Right(str) => {
- if lines_since_mismatch >= context_size {
+ if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
results.push(mismatch);
mismatch = Mismatch::new(line_number - context_queue.len() as u32);
}
if lines_since_mismatch < context_size {
mismatch.lines.push(DiffLine::Context(str.to_owned()));
- } else {
+ } else if context_size > 0 {
context_queue.push_back(str);
}
}
}
}
+
+#[cfg(test)]
+mod test {
+ use super::{make_diff, Mismatch};
+ use super::DiffLine::*;
+
+ #[test]
+ fn diff_simple() {
+ let src = "one\ntwo\nthree\nfour\nfive\n";
+ let dest = "one\ntwo\ntrois\nfour\nfive\n";
+ let diff = make_diff(src, dest, 1);
+ assert_eq!(
+ diff,
+ vec![
+ Mismatch {
+ line_number: 2,
+ lines: vec![
+ Context("two".into()),
+ Resulting("three".into()),
+ Expected("trois".into()),
+ Context("four".into()),
+ ],
+ },
+ ]
+ );
+ }
+
+ #[test]
+ fn diff_simple2() {
+ let src = "one\ntwo\nthree\nfour\nfive\nsix\nseven\n";
+ let dest = "one\ntwo\ntrois\nfour\ncinq\nsix\nseven\n";
+ let diff = make_diff(src, dest, 1);
+ assert_eq!(
+ diff,
+ vec![
+ Mismatch {
+ line_number: 2,
+ lines: vec![
+ Context("two".into()),
+ Resulting("three".into()),
+ Expected("trois".into()),
+ Context("four".into()),
+ ],
+ },
+ Mismatch {
+ line_number: 5,
+ lines: vec![
+ Resulting("five".into()),
+ Expected("cinq".into()),
+ Context("six".into()),
+ ],
+ },
+ ]
+ );
+ }
+
+ #[test]
+ fn diff_zerocontext() {
+ let src = "one\ntwo\nthree\nfour\nfive\n";
+ let dest = "one\ntwo\ntrois\nfour\nfive\n";
+ let diff = make_diff(src, dest, 0);
+ assert_eq!(
+ diff,
+ vec![
+ Mismatch {
+ line_number: 3,
+ lines: vec![Resulting("three".into()), Expected("trois".into())],
+ },
+ ]
+ );
+ }
+}