X-Git-Url: https://git.yukkurigames.com/?p=string-lerp.git;a=blobdiff_plain;f=tests%2Fstring-lerp.js;fp=tests%2Fstring-lerp.js;h=7cee7d175b106f9c312e32109b86a6ebdc20c133;hp=5728e7f9ece4844cfea0f3a17050e6bf405b3999;hb=f037d43269bdb28acf28500ce24d2bef1e011a75;hpb=245005bdfa792a76d55b0fafd2255c4c8325d28c

diff --git a/tests/string-lerp.js b/tests/string-lerp.js
index 5728e7f..7cee7d1 100644
--- a/tests/string-lerp.js
+++ b/tests/string-lerp.js
@@ -114,6 +114,22 @@ JS.Test.describe('diff lerp', function () { with (this) {
             assert(r === "a" || r === UNUSUAL_Q);
         }
     }});
+
+    it("prefers ins/del to sub/sub", function () { with (this) {
+        // When the cost is uniform this string can be transformed by
+        // rewriting the whole thing for the same cost as deleting the
+        // front and adding to the back. But visually, we'd rather do
+        // the latter.
+        assertEqual("core", lerp("hard core", "core dump", 0.50));
+    }});
+
+    it("weights ins/del cheaper than sub", function () { with (this) {
+        // When the cost is uniform it is cheaper to rewrite the
+        // former into the latter. But we'd rather keep the "core" for
+        // visual reasons, so we need to make sure we have unequal
+        // costs.
+        assertEqual("core", lerp("apple core", "core dump", 0.51));
+    }});
 }});
 
 JS.Test.describe('numeric lerp', function () { with (this) {