added unit testing, and started implementing unit tests...phew

node_modules/@sinonjs/samsam/lib/is-subset.js

@@ -0,0 +1,18 @@
+"use strict";
+
+function isSubset(s1, s2, compare) {
+    var allContained = true;
+    s1.forEach(function(v1) {
+        var includes = false;
+        s2.forEach(function(v2) {
+            if (compare(v2, v1)) {
+                includes = true;
+            }
+        });
+        allContained = allContained && includes;
+    });
+
+    return allContained;
+}
+
+module.exports = isSubset;