diff --git a/test/unit/run.js b/test/unit/run.js
index 4f5cffde..5c270d15 100644
--- a/test/unit/run.js
+++ b/test/unit/run.js
@@ -11,6 +11,7 @@ var tests = [
   require('./service/search'),
   require('./service/suggest'),
   require('./sanitiser/suggest'),
+  require('./sanitiser/reverse'),
   require('./sanitiser/doc'),
   require('./sanitiser/coarse'),
   require('./query/indeces'),
diff --git a/test/unit/sanitiser/reverse.js b/test/unit/sanitiser/reverse.js
new file mode 100644
index 00000000..a6627273
--- /dev/null
+++ b/test/unit/sanitiser/reverse.js
@@ -0,0 +1,237 @@
+
+var suggest  = require('../../../sanitiser/reverse'),
+    _sanitize = suggest.sanitize,
+    middleware = suggest.middleware,
+    delim = ',',
+    defaultError = 'missing param \'lat\': must be >-90 and <90',
+    defaultClean =  { lat:0,
+                      layers: [ 'geoname', 'osmnode', 'osmway', 'admin0', 'admin1', 'admin2', 'neighborhood', 
+                                'osmaddress', 'openaddresses' ], 
+                      lon: 0,
+                      size: 1
+                    },
+    sanitize = function(query, cb) { _sanitize({'query':query}, cb); };
+
+module.exports.tests = {};
+
+module.exports.tests.interface = function(test, common) {
+  test('sanitize interface', function(t) {
+    t.equal(typeof sanitize, 'function', 'sanitize is a function');
+    t.equal(sanitize.length, 2, 'sanitize interface');
+    t.end();
+  });
+  test('middleware interface', function(t) {
+    t.equal(typeof middleware, 'function', 'middleware is a function');
+    t.equal(middleware.length, 3, 'sanitizee has a valid middleware');
+    t.end();
+  });
+};
+
+module.exports.tests.sanitize_lat = function(test, common) {
+  var lats = {
+    invalid: [ -181, -120, -91, 91, 120, 181 ],
+    valid: [ 0, 45, 90, -0, '0', '45', '90' ],
+    missing: ['', undefined, ,null]
+  };
+  test('invalid lat', function(t) {  
+    lats.invalid.forEach( function( lat ){
+      sanitize({ lat: lat, lon: 0 }, function( err, clean ){
+        t.equal(err, 'invalid param \'lat\': must be >-90 and <90', lat + ' is an invalid latitude');
+        t.equal(clean, undefined, 'clean not set');
+      });
+    });
+    t.end();
+  });
+  test('valid lat', function(t) {  
+    lats.valid.forEach( function( lat ){
+      sanitize({ lat: lat, lon: 0 }, function( err, clean ){
+        var expected = JSON.parse(JSON.stringify( defaultClean ));
+        expected.lat = parseFloat( lat );
+        t.equal(err, undefined, 'no error');
+        t.deepEqual(clean, expected, 'clean set correctly (' + lat + ')');
+      });
+    });
+    t.end();
+  });
+  test('missing lat', function(t) {  
+    lats.missing.forEach( function( lat ){
+      sanitize({ lat: lat, lon: 0 }, function( err, clean ){
+        t.equal(err, 'missing param \'lat\': must be >-90 and <90', 'latitude is a required field');
+        t.equal(clean, undefined, 'clean not set');
+      });
+    });
+    t.end();
+  });
+};
+
+module.exports.tests.sanitize_lon = function(test, common) {
+  var lons = {
+    invalid: [ -360, -181, 181, 360 ],
+    valid: [ -180, -1, -0, 0, 45, 90, '-180', '0', '180' ],
+    missing: ['', undefined, ,null]
+  };
+  test('invalid lon', function(t) {  
+    lons.invalid.forEach( function( lon ){
+      sanitize({ input: 'test', lat: 0, lon: lon }, function( err, clean ){
+        t.equal(err, 'invalid param \'lon\': must be >-180 and <180', lon + ' is an invalid longitude');
+        t.equal(clean, undefined, 'clean not set');
+        
+      });
+    });
+    t.end();
+  });
+  test('valid lon', function(t) {  
+    lons.valid.forEach( function( lon ){
+      sanitize({ input: 'test', lat: 0, lon: lon }, function( err, clean ){
+        var expected = JSON.parse(JSON.stringify( defaultClean ));
+        expected.lon = parseFloat( lon );
+        t.equal(err, undefined, 'no error');
+        t.deepEqual(clean, expected, 'clean set correctly (' + lon + ')');
+      });
+    });
+    t.end();
+  });
+  test('missing lon', function(t) {  
+    lons.missing.forEach( function( lon ){
+      sanitize({ lat: 0, lon: lon }, function( err, clean ){
+        t.equal(err, 'missing param \'lon\': must be >-180 and <180', 'longitude is a required field');
+        t.equal(clean, undefined, 'clean not set');
+      });
+    });
+    t.end();
+  });
+};
+
+
+module.exports.tests.sanitize_size = function(test, common) {
+  test('invalid size value', function(t) {
+    sanitize({ size: 'a', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.equal(clean.size, 1, 'default size set');
+      t.end();
+    });
+  });
+  test('below min size value', function(t) {
+    sanitize({ size: -100, input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.equal(clean.size, 1, 'min size set');
+      t.end();
+    });
+  });
+  test('above max size value', function(t) {
+    sanitize({ size: 9999, input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.equal(clean.size, 40, 'max size set');
+      t.end();
+    });
+  });
+};
+
+module.exports.tests.sanitize_layers = function(test, common) {
+  test('unspecified', function(t) {
+    sanitize({ layers: undefined, input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, defaultClean.layers, 'default layers set');
+      t.end();
+    });
+  });
+  test('invalid layer', function(t) {
+    sanitize({ layers: 'test_layer', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      var msg = 'invalid param \'layer\': must be one or more of ';
+      t.true(err.match(msg), 'invalid layer requested');
+      t.true(err.length > msg.length, 'invalid error message');
+      t.end();
+    });
+  });
+  test('poi (alias) layer', function(t) {
+    var poi_layers = ['geoname','osmnode','osmway'];
+    sanitize({ layers: 'poi', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, poi_layers, 'poi layers set');
+      t.end();
+    });
+  });
+  test('admin (alias) layer', function(t) {
+    var admin_layers = ['admin0','admin1','admin2','neighborhood'];
+    sanitize({ layers: 'admin', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, admin_layers, 'admin layers set');
+      t.end();
+    });
+  });
+  test('address (alias) layer', function(t) {
+    var address_layers = ['osmaddress','openaddresses'];
+    sanitize({ layers: 'address', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, address_layers, 'address layers set');
+      t.end();
+    });
+  });
+  test('poi alias layer plus regular layers', function(t) {
+    var poi_layers = ['geoname','osmnode','osmway'];
+    var reg_layers = ['admin0', 'admin1'];
+    sanitize({ layers: 'poi,admin0,admin1', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, reg_layers.concat(poi_layers), 'poi + regular layers');
+      t.end();
+    });
+  });
+  test('admin alias layer plus regular layers', function(t) {
+    var admin_layers = ['admin0','admin1','admin2','neighborhood'];
+    var reg_layers   = ['geoname', 'osmway'];
+    sanitize({ layers: 'admin,geoname,osmway', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, reg_layers.concat(admin_layers), 'admin + regular layers set');
+      t.end();
+    });
+  });
+  test('address alias layer plus regular layers', function(t) {
+    var address_layers = ['osmaddress','openaddresses'];
+    var reg_layers   = ['geoname', 'osmway'];
+    sanitize({ layers: 'address,geoname,osmway', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, reg_layers.concat(address_layers), 'address + regular layers set');
+      t.end();
+    });
+  });
+  test('alias layer plus regular layers (no duplicates)', function(t) {
+    var poi_layers = ['geoname','osmnode','osmway'];
+    sanitize({ layers: 'poi,geoname,osmnode', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, poi_layers, 'poi layers found (no duplicates)');
+      t.end();
+    });
+  });
+  test('multiple alias layers (no duplicates)', function(t) {
+    var alias_layers = ['geoname','osmnode','osmway','admin0','admin1','admin2','neighborhood'];
+    sanitize({ layers: 'poi,admin', input: 'test', lat: 0, lon: 0 }, function( err, clean ){
+      t.deepEqual(clean.layers, alias_layers, 'all layers found (no duplicates)');
+      t.end();
+    });
+  });
+};
+
+module.exports.tests.middleware_failure = function(test, common) {
+  test('middleware failure', function(t) {
+    var res = { status: function( code ){
+      t.equal(code, 400, 'status set');
+    }};
+    var next = function( message ){
+      t.equal(message, defaultError);
+      t.end();
+    };
+    middleware( {}, res, next );
+  });
+};
+
+module.exports.tests.middleware_success = function(test, common) {
+  test('middleware success', function(t) {
+    var req = { query: { input: 'test', lat: 0, lon: 0 }};
+    var next = function( message ){
+      t.equal(message, undefined, 'no error message set');
+      t.deepEqual(req.clean, defaultClean);
+      t.end();
+    };
+    middleware( req, undefined, next );
+  });
+};
+
+module.exports.all = function (tape, common) {
+
+  function test(name, testFunction) {
+    return tape('SANTIZE /reverse ' + name, testFunction);
+  }
+
+  for( var testCase in module.exports.tests ){
+    module.exports.tests[testCase](test, common);
+  }
+};
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