1 files changed, 59 insertions, 0 deletions
diff --git a/addon-sdk/source/lib/diffpatcher/test/diff.js b/addon-sdk/source/lib/diffpatcher/test/diff.js
new file mode 100644
index 000000000..d1d674005
--- /dev/null
+++ b/addon-sdk/source/lib/diffpatcher/test/diff.js
@@ -0,0 +1,59 @@
+"use strict";
+
+var diff = require("../diff")
+
+exports["test diff from null"] = function(assert) {
+  var to = { a: 1, b: 2 }
+  assert.equal(diff(null, to), to, "diff null to x returns x")
+  assert.equal(diff(void(0), to), to, "diff undefined to x returns x")
+
+}
+
+exports["test diff to null"] = function(assert) {
+  var from = { a: 1, b: 2 }
+  assert.deepEqual(diff({ a: 1, b: 2 }, null),
+                   { a: null, b: null },
+                   "diff x null returns x with all properties nullified")
+}
+
+exports["test diff identical"] = function(assert) {
+  assert.deepEqual(diff({}, {}), {}, "diff on empty objects is {}")
+
+  assert.deepEqual(diff({ a: 1, b: 2 }, { a: 1, b: 2 }), {},
+                   "if properties match diff is {}")
+
+  assert.deepEqual(diff({ a: 1, b: { c: { d: 3, e: 4 } } },
+                        { a: 1, b: { c: { d: 3, e: 4 } } }), {},
+                   "diff between identical nested hashes is {}")
+
+}
+
+exports["test diff delete"] = function(assert) {
+  assert.deepEqual(diff({ a: 1, b: 2 }, { b: 2 }), { a: null },
+                   "missing property is deleted")
+  assert.deepEqual(diff({ a: 1, b: 2 }, { a: 2 }), { a: 2, b: null },
+                   "missing property is deleted another updated")
+  assert.deepEqual(diff({ a: 1, b: 2 }, {}), { a: null, b: null },
+                   "missing propertes are deleted")
+  assert.deepEqual(diff({ a: 1, b: { c: { d: 2 } } }, {}),
+                   { a: null, b: null },
+                   "missing deep propertes are deleted")
+  assert.deepEqual(diff({ a: 1, b: { c: { d: 2 } } }, { b: { c: {} } }),
+                   { a: null, b: { c: { d: null } } },
+                   "missing nested propertes are deleted")
+}
+
+exports["test add update"] = function(assert) {
+  assert.deepEqual(diff({ a: 1, b: 2 }, { b: 2, c: 3 }), { a: null, c: 3 },
+                   "delete and add")
+  assert.deepEqual(diff({ a: 1, b: 2 }, { a: 2, c: 3 }), { a: 2, b: null, c: 3 },
+                   "delete and adds")
+  assert.deepEqual(diff({}, { a: 1, b: 2 }), { a: 1, b: 2 },
+                   "diff on empty objcet returns equivalen of to")
+  assert.deepEqual(diff({ a: 1, b: { c: { d: 2 } } }, { d: 3 }),
+                   { a: null, b: null, d: 3 },
+                   "missing deep propertes are deleted")
+  assert.deepEqual(diff({ b: { c: {} }, d: null }, { a: 1, b: { c: { d: 2 } } }),
+                   { a: 1, b: { c: { d: 2 } } },
+                   "missing nested propertes are deleted")
+}