Add tests for permissions.permits()

tests/js/permissions-service-test.coffee

@@ -40,6 +40,7 @@ describe 'h', ->
       assert.equal(perms.delete[0], 'acct:flash@gordon')
       assert.equal(perms.admin[0], 'acct:flash@gordon')
 
+    describe 'isPublic', ->
       it 'isPublic() true if the read permission has group:__world__ in it', ->
         annotation = {
           permissions: {
@@ -59,3 +60,30 @@ describe 'h', ->
         assert.isFalse(permissions.isPublic(annotation))
         annotation.permissions.read = ['one', 'two', 'three']
         assert.isFalse(permissions.isPublic(annotation))
+
+    describe 'permits', ->
+      it 'returns true when annotation has no permissions', ->
+        annotation = {}
+        assert.isTrue(permissions.permits(null, annotation, null))
+
+      it 'returns false for unknown action', ->
+        annotation = {permissions: permissions.private()}
+        action = 'Hadouken-ing'
+        assert.isFalse(permissions.permits(action, annotation, null))
+
+      it 'returns true if user different, but permissions has group:__world__', ->
+        annotation = {permissions: permissions.public()}
+        annotation.permissions.read.push 'acct:darthsidious@deathstar.emp'
+        user = 'acct:darthvader@deathstar.emp'
+        assert.isTrue(permissions.permits('read', annotation, user))
+
+      it 'returns true if user is in permissions[action] list', ->
+        annotation = {permissions: permissions.private()}
+        user = 'acct:rogerrabbit@toonland'
+        annotation.permissions.read.push user
+        assert.isTrue(permissions.permits('read', annotation, user))
+
+      it 'returns false if the user name is missing from the list', ->
+        annotation = {permissions: permissions.private()}
+        user = 'acct:rogerrabbit@toonland'
+        assert.isFalse(permissions.permits('read', annotation, user))