Implementing unregister method and corresponding tests.

dist/modulejs.js

@@ -259,12 +259,22 @@ return /******/ (function(modules) { // webpackBootstrap
 	        return out;
 	    };
 
+	    // Unregisters a module for `id: String`
+	    var unregister = function unregister(id) {
+	        // check arguments
+	        assert(isString(id), 'id must be string: ' + id);
+	        assert(has(definitions, id), 'id already defined: ' + id);
+
+	        delete definitions[id];
+	    };
+
 	    return {
 	        create: create,
 	        define: define,
 	        log: log,
 	        require: require,
 	        state: state,
+	        unregister: unregister,
 	        _private: {
 	            assert: assert,
 	            contains: contains,

lib/modulejs.js

@@ -192,12 +192,22 @@ const create = () => {
         return out;
     };
 
+    // Unregisters a module for `id: String`
+    const unregister = id => {
+        // check arguments
+        assert(isString(id), 'id must be string: ' + id);
+        assert(has(definitions, id), 'id already defined: ' + id);
+
+        delete definitions[id];
+    };
+
     return {
         create,
         define,
         log,
         require,
         state,
+        unregister,
         _private: {
             assert,
             contains,

test/sub/modulejs.js

@@ -7,6 +7,7 @@ const PROPS = [
     'log',
     'require',
     'state',
+    'unregister',
     '_private'
 ];
 

test/sub/unregister.js

@@ -0,0 +1,44 @@
+const {test, assert, insp} = require('scar');
+const modulejs = require('../loader').modulejs;
+
+test('modulejs.unregister is function', () => {
+    assert.equal(typeof modulejs.unregister, 'function');
+});
+
+test('modulejs.unregister() throws', () => {
+    const modjs = modulejs.create();
+    assert.throws(() => modjs.unregister(), /id must be string/);
+});
+
+test('modulejs.unregister() throws if non-string id', () => {
+    const modjs = modulejs.create();
+    assert.throws(() => modjs.unregister(true), /id must be string/);
+});
+
+test('modulejs.unregister() throws if undefined module', () => {
+    const modjs = modulejs.create();
+    assert.throws(() => modjs.unregister('a'), /id already defined/);
+});
+
+[
+    undefined,
+    null,
+    true,
+    false,
+    0,
+    1,
+    [],
+    {},
+    ''
+].forEach(x => {
+    test(`modulejs.unregister(id, arr, ${insp(x)})  ->  .define(id, arr, function () { return ${insp(x)}; })`, () => {
+        const modjs = modulejs.create();
+        const defs = modjs._private.definitions;
+        const id = 'a';
+        assert.equal(modjs.define(id, x), undefined);
+
+        modjs.unregister(id);
+        assert.equal(typeof defs[id], 'undefined');
+        assert.throws(() => modjs.require('a'), /id not defined/);
+    });
+});

test/tests.js

@@ -17,4 +17,5 @@ require('./sub/require');
 require('./sub/resolve');
 require('./sub/state');
 require('./sub/uniq');
+require('./sub/unregister');
 test.cli();