added test cases

Author: codewithmide

Cash_Register/Cash_Register.md

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+# Cash Register
+Design a cash register drawer function `checkCashRegister()` that accepts purchase price as the first argument `(price)`, payment as the second argument `(cash)`, and cash-in-drawer `(cid)` as the third argument.
+
+`cid` is a 2D array listing available `currency`.
+
+The `checkCashRegister()` function should always return an object with a `status key` and a `change ke`y.
+
+Return `{status: "INSUFFICIENT_FUNDS", change: []}` if cash-in-drawer is less than the change due, or if you cannot return the exact change.
+
+Return `{status: "CLOSED", change: [...]}` with cash-in-drawer as the value for the key change if it is equal to the change due.
+
+Otherwise, return `{status: "OPEN", change: [...]}`, with the change due in coins and bills, sorted in highest to lowest order, as the value of the change key.
+
+|Currency Unit |Amount |
+- | -
+|Penny	|$0.01 (PENNY)|
+|Nickel	|$0.05 (NICKEL)|
+|Dime	|$0.1 (DIME)|
+|Quarter	|$0.25 (QUARTER)|
+|Dollar	|$1 (ONE)|
+|Five Dollars	|$5 (FIVE)|
+|Ten Dollars	|$10 (TEN)|
+|Twenty Dollars	|$20 (TWENTY)|
+|One-hundred Dollars	|$100 (ONE HUNDRED)|
+
+See below for an example of a cash-in-drawer array:
+```
+[
+  ["PENNY", 1.01],
+  ["NICKEL", 2.05],
+  ["DIME", 3.1],
+  ["QUARTER", 4.25],
+  ["ONE", 90],
+  ["FIVE", 55],
+  ["TEN", 20],
+  ["TWENTY", 60],
+  ["ONE HUNDRED", 100]
+]
+```