Finish renaming a/b/p to source/target/amount. Start splitting up functions for array...

[string-lerp.git] / tests / string-lerp.js

diff --git a/tests/string-lerp.js b/tests/string-lerp.js
index 7cee7d1..0a68921 100644 (file)
--- a/tests/string-lerp.js
+++ b/tests/string-lerp.js
@@ -169,3 +169,36 @@ JS.Test.describe('numeric lerp', function () { with (this) {
         assertEqual("Chapter 5. The sky was rgb(0, 0, 128).", lerp(A, B, 0.5));
     }});
 }});
+
+JS.Test.describe('fast lerp', function () { with (this) {
+    var lerp = m.lerp;
+    var A = "Do you like green eggs and ham?";
+    var B = "I do not like them, Sam-I-am.";
+
+    it("handles empty strings", function () { with (this) {
+        assertEqual("", lerp("", "", -1));
+        assertEqual("", lerp("", "", 0));
+        assertEqual("", lerp("", "", 0.5));
+        assertEqual("", lerp("", "", 1));
+        assertEqual("", lerp("", "", 2));
+    }});
+
+    it("maintains identity", function () { with (this) {
+        for (var i = -1; i < 2; i += 1/1024) {
+            assertEqual(A, lerp(A, A, i));
+            assertEqual(B, lerp(B, B, i));
+        }
+    }});
+
+    it("handles lows", function () { with (this) {
+        assertEqual(A, lerp(A, B, -Infinity));
+        assertEqual(A, lerp(A, B, -1));
+        assertEqual(A, lerp(A, B, 0));
+    }});
+
+    it("handles highs", function () { with (this) {
+        assertEqual(B, lerp(A, B, 1));
+        assertEqual(B, lerp(A, B, 2));
+        assertEqual(B, lerp(A, B, Infinity));
+    }});
+}});