Add the ability to report duplicate IDs

Fixes #4

lib/model/testcase.js

@@ -19,8 +19,12 @@ function Testcase(id, instructions, state, bug, userStory, variables) {
   if (Testcase._isOptionalFieldDefined(variables)) {
     this.variables = variables;
   }
+
+  Testcase.alreadyDefinedIds.push(this.id);
 }
 
+Testcase.alreadyDefinedIds = [];
+
 Testcase.isValidState = function(candidate) {
   return VALID_STATES.indexOf(candidate) !== -1;
 };
@@ -32,6 +36,8 @@ Testcase._sanitizeId = function(candidate) {
   } finally {
     if (!/^[A-Za-z_.]+$/.test(candidate)) {
       errorHandler.add(new Error('"' + candidate + '" should contains only letters, dots, and underscores'));
+    } else if (Testcase.alreadyDefinedIds.indexOf(candidate) > -1) {
+      errorHandler.add(new Error('The id "' + candidate + '" is already used'));
     }
     return candidate;
   }

test/unit/model/testcase.js

@@ -23,6 +23,7 @@ describe('Testcase parser', function () {
 
     beforeEach(function() {
       object = {};
+      Testcase.alreadyDefinedIds.length = 0;
     });
 
     it('should accept all attributes', function() {
@@ -71,6 +72,11 @@ describe('Testcase parser', function () {
       var testcase = new Testcase('id', 'instructions');
       assert.isUndefined(testcase.variables);
     });
+
+    it('should push the id to the array of already defined Ids', function() {
+      new Testcase('newId', 'instructions');
+      assert.include(Testcase.alreadyDefinedIds, 'newId');
+    });
   });
 
   describe('isValidState()', function() {
@@ -113,6 +119,12 @@ describe('Testcase parser', function () {
       Testcase._sanitizeId('fxos test');
       sinon.assert.calledWith(addMock, new Error('"fxos test" should contains only letters, dots, and underscores'));
     });
+
+    it('should add an error if the id is already defined', function() {
+      new Testcase('dupeId', 'instructions');
+      Testcase._sanitizeId('dupeId');
+      sinon.assert.calledWith(addMock, new Error('The ID "newId" is already used'));
+    });
   });
 
   describe('_sanitizeString()', function() {