diff --git a/.travis.yml b/.travis.yml
index b320edc..c7739b0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
   - "6"
-  - "6.1"
-  - "5.11"
-  - "iojs"
\ No newline at end of file
+  - "8"
+  - "10"
+  - "12"
diff --git a/bit-mask.js b/bit-mask.js
index ab74481..5e4dc7d 100644
--- a/bit-mask.js
+++ b/bit-mask.js
@@ -16,7 +16,7 @@ BitMask.prototype.setBit = function(position, value){
     }
 };
 BitMask.prototype.getBit = function(position){
-    return !!((1 << (this.base-position) ) & this.value);
+    return !!((1 << position) & this.value);
 }
 BitMask.prototype.bits = function(){
     return this.value.toString(2);
@@ -88,8 +88,8 @@ OwnershipMask.prototype.modify = function(clause){
         }
     }
 }
-OwnershipMask.prototype.contexts = ['user', 'group', 'world'];
-OwnershipMask.prototype.permissions = ['read', 'write', 'execute'];
+OwnershipMask.prototype.contexts = ['user', 'group', 'world'].reverse();
+OwnershipMask.prototype.permissions = ['read', 'write', 'execute'].reverse();
 OwnershipMask.prototype.setBit = BitMask.prototype.setBit;
 OwnershipMask.prototype.getBit = BitMask.prototype.getBit;
 OwnershipMask.prototype.bits = BitMask.prototype.bits;
diff --git a/package.json b/package.json
index 3750a1a..76db4ea 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,9 @@
         "type": "git",
         "url": "git@github.com:khrome/bit-mask.git"
     },
+    "scripts": {
+        "test": "mocha"
+    },
     "dependencies": {
         "array-events": "^0.2.0"
     },
diff --git a/test.js b/test.js
index ca062ca..5bce9ca 100644
--- a/test.js
+++ b/test.js
@@ -4,64 +4,103 @@ var BitMask = require('./bit-mask');
 var OwnershipMask = BitMask.OwnershipMask;
 
 describe('BitMask', function(){
+    describe('.getBit()', function(){
+      it('reads bits set on initialization', function(){
+        var mask = new BitMask('01111010', 2);
+        mask.getBit(0).should.equal(false, 'bit 0');
+        mask.getBit(1).should.equal(true, 'bit 0');
+        mask.getBit(2).should.equal(false, 'bit 2');
+        mask.getBit(3).should.equal(true, 'bit 3');
+        mask.getBit(4).should.equal(true, 'bit 4');
+        mask.getBit(5).should.equal(true, 'bit 5');
+        mask.getBit(6).should.equal(true, 'bit 6');
+        mask.getBit(7).should.equal(false, 'bit 7');
+
+        for(var n=8; n < 31; n++){
+          mask.getBit(n).should.equal(false, 'bit ' + n);
+        }
+      });
+
+      it('reads bits set by setBit()', function(){
+        var mask = new BitMask('0');
+
+        mask.setBit(14, true);
+        mask.getBit(14).should.equal(true, 'bit 14 should be set');
+
+        mask.setBit(3, true);
+        mask.getBit(3).should.equal(true, 'bit 3 should be set');
+        mask.setBit(3, false);
+        mask.getBit(3).should.equal(false, 'bit 3 should be unset');
+      });
+    });
+
     describe('> OwnershipMask', function(){
         var mask;
-        
+
         before(function(){
             mask = new OwnershipMask('755');
         });
-    
-        it('user read [1]', function(){
-            mask.getBit(0).should.equal(mask.hasPermission('user', 'read'));
-            mask.getBit(0).should.equal(true);
+
+        it('user read [8]', function(){
+            mask.getPosition('user', 'read').should.equal(8);
+            mask.getBit(8).should.equal(mask.hasPermission('user', 'read'));
+            mask.getBit(8).should.equal(true);
             mask.hasPermission('user', 'read').should.equal(true);
         });
-        
-        it('user write [2]', function(){
-            mask.getBit(1).should.equal(mask.hasPermission('user', 'write'));
-            mask.getBit(1).should.equal(true);
+
+        it('user write [7]', function(){
+            mask.getPosition('user', 'write').should.equal(7);
+            mask.getBit(7).should.equal(mask.hasPermission('user', 'write'));
+            mask.getBit(7).should.equal(true);
             mask.hasPermission('user', 'write').should.equal(true);
         });
-        
-        it('user execute [3]', function(){
-            mask.getBit(2).should.equal(mask.hasPermission('user', 'execute'));
-            mask.getBit(2).should.equal(true);
+
+        it('user execute [6]', function(){
+            mask.getPosition('user', 'execute').should.equal(6);
+            mask.getBit(6).should.equal(mask.hasPermission('user', 'execute'));
+            mask.getBit(6).should.equal(true);
             mask.hasPermission('user', 'execute').should.equal(true);
         });
-        
-        it('group read [4]', function(){
-            mask.getBit(3).should.equal(mask.hasPermission('group', 'read'));
-            mask.getBit(3).should.equal(true);
+
+        it('group read [5]', function(){
+            mask.getPosition('group', 'read').should.equal(5);
+            mask.getBit(5).should.equal(mask.hasPermission('group', 'read'));
+            mask.getBit(5).should.equal(true);
             mask.hasPermission('group', 'read').should.equal(true);
         });
-        
-        it('group write [5]', function(){
+
+        it('group write [4]', function(){
+            mask.getPosition('group', 'write').should.equal(4);
             mask.getBit(4).should.equal(mask.hasPermission('group', 'write'));
             mask.getBit(4).should.equal(false);
             mask.hasPermission('group', 'write').should.equal(false);
         });
-        
-        it('group execute [6]', function(){
-            mask.getBit(5).should.equal(mask.hasPermission('group', 'execute'));
-            mask.getBit(5).should.equal(true);
+
+        it('group execute [3]', function(){
+            mask.getPosition('group', 'execute').should.equal(3);
+            mask.getBit(3).should.equal(mask.hasPermission('group', 'execute'));
+            mask.getBit(3).should.equal(true);
             mask.hasPermission('group', 'execute').should.equal(true);
         });
-        
-        it('world read [7]', function(){
-            mask.getBit(6).should.equal(mask.hasPermission('world', 'read'));
-            mask.getBit(6).should.equal(true);
+
+        it('world read [2]', function(){
+            mask.getPosition('world', 'read').should.equal(2);
+            mask.getBit(2).should.equal(mask.hasPermission('world', 'read'));
+            mask.getBit(2).should.equal(true);
         });
-        
-        it('world write [8]', function(){
-            mask.getBit(7).should.equal(mask.hasPermission('world', 'write'));
-            mask.getBit(7).should.equal(false);
+
+        it('world write [1]', function(){
+            mask.getPosition('world', 'write').should.equal(1);
+            mask.getBit(1).should.equal(mask.hasPermission('world', 'write'));
+            mask.getBit(1).should.equal(false);
             mask.hasPermission('world', 'write').should.equal(false);
         });
-        
-        it('world execute [9]', function(){
-            mask.getBit(8).should.equal(mask.hasPermission('world', 'execute'));
-            mask.getBit(8).should.equal(true);
+
+        it('world execute [0]', function(){
+            mask.getPosition('world', 'execute').should.equal(0);
+            mask.getBit(0).should.equal(mask.hasPermission('world', 'execute'));
+            mask.getBit(0).should.equal(true);
             mask.hasPermission('world', 'execute').should.equal(true);
         });
     });
-});
\ No newline at end of file
+});