Simple routine to run a list of tests on mathematical functions where each test checks the return value for equality against a known value using a list of predefined parameters. Requires http://www.diveintojavascript.com/projects/javascript-sprintf. Released under GNU GPL.

mathtest.js

function addAll(a, b, c)
{
  return a + b + c;
}

function multiplyAll(a, b, c)
{
  return a * b * c;
}

var suiteDefns = 
[
  {name: "testAddAll", method: addAll, tests:
   [
     {params:[2, 3, 4], expected_val: 10, tollerance:0},
     {params:[5, 6, 7], expected_val: 18, tollerance:0}
   ]
  },
  {name: "testMultipleAll", method: multiplyAll, tests:
   [
     {params:[2, 3, 4], expected_val: 24, tollerance:0},
     {params:[5, 6, 7], expected_val: 210, tollerance:0}
   ]
  }
]

function testCalculation(suiteDefn)
{
  var name = suiteDefn.name;
  var method = suiteDefn.method;
  var tests = suiteDefn.tests;
  for(var i in tests)
  {
    var test = tests[i];
    var params = test.params;
    var expected = test.expected_val;
    var tollerance = test.tollerance;
    
    var result = method.apply(this, params);

    if(Math.abs(result - expected) > tollerance)
    {
      var errMsg = sprintf(
        "Test %s failed (expected %f but got %f).",
        name,
        expected,
        result
      );
      console.log(errMsg);
    }
  }
}

function runTests()
{
  console.log("Running tests...");
  for(var i in suiteDefns)
  {
    var suite = suiteDefns[i];
    testCalculation(suite);
  }
  console.log("Tests complete.");
}

runTests();