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Fixed a null pointer exception occuring in some specific cases.

Fixed #48 Fixed verifying call count when not all optional arguments was given

Thanks to @Markus-Ende we can now mock propertie that aren't getters.

Please note, that stubbing properties that don't have getters only works if Proxy object is available (ES6).

Thanks to @dreef3 we got new spying feature!

Usage:

const foo: Foo = new Foo();
const spiedFoo = spy(foo);

when(spiedFoo.getBar(3)).thenReturn('one');

console.log(foo.getBar(3)); // 'one'
console.log(foo.getBaz()); // call to a real method

Thanks to @dyong0 we can now mock abstract and generic classes via https://github.com/NagRock/ts-mockito/pull/31

Fixed #28

All changes described in migration guide

Now we can change getter value:

// Creating mock
let mockedFoo:Foo = mock(Foo);

// stub getter before execution
when(mockedFoo.sampleGetter).thenReturn('three');

// Getting instance
let foo:Foo = instance(mockedFoo);

// prints three
console.log(foo.sampleGetter);