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|
extern crate difference;
extern crate quickcheck;
use difference::{Changeset, Difference};
use quickcheck::{TestResult, quickcheck, QuickCheck};
use std::fmt;
const DEBUG: bool = false;
struct Check<'a> {
old: &'a str,
new: &'a str,
changeset: Changeset,
}
impl<'a> fmt::Display for Check<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"Changeset::new({:?}, {:?}, {:?}) -> [",
self.old,
self.new,
self.changeset.split
)?;
let mut iter = self.changeset.diffs.iter();
if let Some(d) = iter.next() {
write!(f, "{:?}", d)?;
}
for d in iter {
write!(f, " {:?}", d)?;
}
write!(f, "]")
}
}
fn check_changeset(old: &str, new: &str, split: &str) -> TestResult {
Check::new(old, new, split).check()
}
impl<'a> Check<'a> {
fn new(old: &'a str, new: &'a str, split: &'a str) -> Check<'a> {
Check {
old: old,
new: new,
changeset: Changeset::new(old, new, split),
}
}
fn check(&self) -> TestResult {
let split = &self.changeset.split;
let mut old: Vec<&str> = Vec::new();
let mut new: Vec<&str> = Vec::new();
for d in &self.changeset.diffs {
if DEBUG {
println!("assert `{:?}` (old: {:?}, new: {:?})", d, old, new);
}
match *d {
Difference::Same(ref x) => {
old.push(x);
new.push(x);
}
Difference::Add(ref x) => {
new.push(x);
}
Difference::Rem(ref x) => {
old.push(x);
}
}
}
let got_old = old.join(split);
let got_new = new.join(split);
if got_old != self.old {
return TestResult::error(format!("Diff output implies old=`{:?}`, not `{:?}` in {}",
got_old, self.old, self,
));
}
if got_new != self.new {
return TestResult::error(format!("Diff output implies new=`{:?}`, not `{:?}` in {}",
got_new, self.new, self,
));
}
TestResult::passed()
}
}
#[test]
fn simple() {
quickcheck(check_changeset("a", "a a", " "));
}
#[test]
fn issue_19() {
// https://github.com/johannhof/difference.rs/issues/19
quickcheck(check_changeset("a b : g", "b a : b b : g g", " "));
}
#[test]
#[allow(needless_pass_by_value)]
fn fuzzy() {
fn prop(old: Vec<usize>, new: Vec<usize>, words: Vec<char>) -> TestResult {
if words.is_empty() {
return TestResult::discard();
}
fn map_to_words(input: &[usize], words: &[char]) -> String {
input.iter().enumerate().fold(
String::new(),
|mut acc, (i, x)| {
if i > 0 {
acc.push(' ');
}
acc.push(words[x % words.len()]);
acc
},
)
}
let old = map_to_words(&old, &words);
let new = map_to_words(&new, &words);
check_changeset(&old, &new, " ")
}
QuickCheck::new()
.tests(100) // max successful tests
.max_tests(10_000) // max attempts
.quickcheck(prop as fn(Vec<usize>, Vec<usize>, Vec<char>) -> TestResult);
}
|
