Wrote some tests

tests/test.rs

@@ -0,0 +1,38 @@
+extern crate difflib;
+
+use difflib::sequencematcher::{SequenceMatcher, Match};
+
+
+#[test]
+fn test_longest_match()
+{
+	let matcher = SequenceMatcher::new(" abcd", "abcd abcd");
+    let m =  matcher.find_longest_match(0, 5, 0, 9);
+    assert_eq!(m.first_start, 0);
+    assert_eq!(m.second_start, 4);
+    assert_eq!(m.size, 5);
+}
+
+#[test]
+fn test_all_matches()
+{
+	let mut matcher = SequenceMatcher::new("abxcd", "abcd");
+	let result = matcher.get_matching_blocks();
+    let mut expected_result = Vec::new();
+    expected_result.push(Match{
+    	first_start: 0,
+    	second_start: 0,
+    	size: 2
+    });
+    expected_result.push(Match{
+    	first_start: 3,
+    	second_start: 2,
+    	size: 2
+    });
+    expected_result.push(Match{
+    	first_start: 5,
+    	second_start: 4,
+    	size: 0
+    });
+    assert_eq!(result, expected_result);
+}