Add more tests

test/test.js

@@ -1,26 +1,36 @@
 'use strict';
 
 var expect = require('chai').expect;
-var solver = require('../index');
+var solve = require('../index');
 
-describe('#solver', function() {
+describe('#solve', function() {
+  it('throw error for bad input types', function() {
+    var result = () => solve(8);
+    expect(result).to.throw('Input must be an array or string');
+  });
+
+  it('throw error for invalid number of elements', function() {
+    var result = () => solve([0, 1, 4, 8, 3, 0, 0, 5]);
+    expect(result).to.throw('Invalid board size');
+  });
+
   it('should solve easy puzzles', function() {
-    var result = solver('050070200007850030280403000060040072035208410920030050000604093070015600006020080');
+    var result = solve('050070200007850030280403000060040072035208410920030050000604093070015600006020080');
     expect(result).to.equal('359176248647852931281493567168549372735268419924731856512684793873915624496327185');
   });
 
   it('should solve medium puzzles', function() {
-    var result = solver('005098014000000000019002708050087020400000001080960030508200640000000000740650100');
+    var result = solve('005098014000000000019002708050087020400000001080960030508200640000000000740650100');
     expect(result).to.equal('625798314874136592319542768153487926496325871287961435538219647961874253742653189');
   });
 
   it('should solve hard puzzles', function() {
-    var result = solver('002000004915008000006003000103700080600040007040009102000900500000300749300000800');
+    var result = solve('002000004915008000006003000103700080600040007040009102000900500000300749300000800');
     expect(result).to.equal('832197654915468273476253918193726485628541397547839162784912536261385749359674821');
   });
 
   it('should solve evil puzzles', function() {
-    var result = solver('700000050040600908030001000308040000002090500000010802000500060109007080050000003');
+    var result = solve('700000050040600908030001000308040000002090500000010802000500060109007080050000003');
     expect(result).to.equal('781924356245673918936851724318245679672398541594716832423589167169437285857162493');
   });