extract truthy sanitizer to own file

sanitiser/_details.js

@@ -1,4 +1,5 @@
 var isObject = require('is-object');
+var isTruthy = require('./_truthy');
 
 // validate inputs, convert types and apply defaults
 function sanitize( req, default_value ){
@@ -27,13 +28,4 @@ function sanitize( req, default_value ){
 
 }
 
-function isTruthy(val) {
-  if (typeof val === 'string') {
-    return ['true', '1', 'yes', 'y'].indexOf(val) !== -1;
-  }
-
-  return val === 1 || val === true;
-}
-
-// export function
 module.exports = sanitize;

sanitiser/_truthy.js

@@ -0,0 +1,9 @@
+function isTruthy(val) {
+  if (typeof val === 'string') {
+    return ['true', '1', 'yes', 'y'].indexOf(val) !== -1;
+  }
+
+  return val === 1 || val === true;
+}
+
+module.exports = isTruthy;

test/unit/run.js

@@ -10,6 +10,7 @@ var tests = [
   require('./service/search'),
   require('./sanitiser/_details'),
   require('./sanitiser/_source'),
+  require('./sanitiser/_truthy'),
   require('./sanitiser/search'),
   require('./sanitiser/reverse'),
   require('./sanitiser/place'),

test/unit/sanitiser/_truthy.js

@@ -0,0 +1,31 @@
+var isTruthy = require('../../../sanitiser/_truthy');
+
+module.exports.tests = {};
+
+module.exports.tests.sanitize_truthy = function(test, common) {
+  var valid_values = ['true', true, 1, '1', 'yes', 'y'];
+  valid_values.forEach(function(value) {
+    test('truthy value ' + value, function(t) {
+      t.equal(isTruthy(value), true, 'returns true');
+      t.end();
+    });
+  });
+
+  var valid_false_values = ['false', false, 0, '0', 'no', 'n', null, -1, 123, NaN, 'abc'];
+  valid_false_values.forEach(function(value) {
+    test('falsey value ' + value, function(t) {
+      t.equal(isTruthy(value), false, 'returns false');
+      t.end();
+    });
+  });
+};
+
+module.exports.all = function (tape, common) {
+  function test(name, testFunction) {
+    return tape('SANTIZE _truthy ' + name, testFunction);
+  }
+
+  for( var testCase in module.exports.tests ){
+    module.exports.tests[testCase](test, common);
+  }
+};