added test for correct amount of arguments and amended function to reflect this

Author: i786m

Sprint-3/2-practice-tdd/count.js

@@ -1,4 +1,9 @@
 function countChar(stringOfCharacters, findCharacter) {
+  if (arguments.length !== 2) {
+    throw new Error(
+      "Function requires exactly two arguments: a string and a character to find."
+    );
+  }
   if (typeof stringOfCharacters !== 'string'){
     throw new Error("First argument must be a string.");
   }

Sprint-3/2-practice-tdd/count.test.js

@@ -103,3 +103,14 @@ test.each([
     countChar(str, char);
   }).toThrow(error);
 });
+//test for 2 arguments
+test("should throw error if more/less than 2 arguments are provided", () => {
+  expect(() => {
+    countChar("hello");
+  }).toThrow("Function requires exactly two arguments: a string and a character to find.");
+  expect(() => {
+    countChar("hello", "h", "extra");
+  }).toThrow(
+    "Function requires exactly two arguments: a string and a character to find."
+  );
+});