Test can not find sources with legacy javascript (no ams module)

[Prideth]

I tried to get karma, jasmine working. But when i run the tests. I get to following error

PhantomJS 2.1.1 (Windows 8 0.0.0) TestSuite firstTest FAILED
        ReferenceError: Can't find variable: example in test/specs/index.spec.js (line 10)
        test/specs/index.spec.js:10:21
        loaded@http://localhost:9876/context.js:162:17
        TypeError: undefined is not an object (evaluating 'b.init') in test/specs/index.spec.js (line 22)

my sources look like this:

var example = {
	exampleFunction: a => [1, 2, 3].map(n => n ** a)

}

And the spec is the following:

describe("TestSuite", function() {
	var a, b, c;

	beforeEach(function() {
    	a = 1;
    	b = new example;
    	c = b.exampleFunction(a);
    	spyOn(b, 'init').andCallThrough();
  	});
 
  	afterEach(function() {
    	a = 0;
    	b = {};
    	c = [];
  	});

	it("firstTest", function() {
		expect(b.init).toBeDefined();
    	expect(c).toBe([1, 2, 3]);
  	});

  	it("secondTest", function() {
    	expect(2).toEqual(4);
  	});

  	it("thirdTest", function() {
    	expect(c).toContain(1);
    	expect(c).toContain(2);
    	expect(c).toContain(4);
  	});
});

Can anybody help me and tell me where the problem is?