Preliminary attempt to add test cases for require.ensure error handler

test/cases/parsing/issue-758/errors.js

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+module.exports = [
+	[/Module not found/, /Can't resolve '\.\/missingModule' /]
+];

test/cases/parsing/issue-758/file.js

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+define(function() {
+	return "file";
+});

test/cases/parsing/issue-758/index.js

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+it("should require existing module with supplied error callback", function(done) {
+	require.ensure(['./file'], function(){
+		var file = require('.file');
+		file.should.be.eql("file");
+		done();
+	}, function(error) {});
+});
+
+it("should call error callback on missing module", function(done) {
+	require.ensure(['./missingModule'], function(){}, function(error) {
+		error.should.be.instanceOf(Error);
+		error.message.should.be.eql('Cannot find module "./missingModule"');
+		done();
+	});
+});
+
+it("should call error callback on missing module in context", function(done) {
+	(function(module) {
+		require.ensure(['./' + module], function(){}, function(error) {
+			error.should.be.instanceOf(Error);
+			error.message.should.be.eql("Cannot find module './missingModule'.");
+			done();
+		});
+	})('missingModule');
+});
+
+it("should call error callback on exception thrown in loading module", function(done) {
+	require.ensure(['./throwing'], function(){}, function(error) {
+		error.should.be.instanceOf(Error);
+		error.message.should.be.eql('message');
+		done();
+	});
+});
+
+it("should not call error callback on exception thrown in require callback", function(done) {
+	require.esnure(['./throwing'], function() {
+		throw new Error('message');
+	}, function(error) {
+		error.should.be.instanceOf(Error);
+		error.message.should.be.eql('message');
+		done();
+	});
+});

test/cases/parsing/issue-758/throwing.js

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+define(function() {
+	throw new Error('message');
+});