@Test
public void shouldInitialiseEmptyRepository() throws Exception {
Inventory inventory = new Inventory();
assertThat(inventory.getAllPurchases()).isEmpty();
assertThat(inventory.getSkuDetails()).isEmpty();
assertThat(inventory.getAllOwnedSkus()).isEmpty();
}
@Test
public void testAddPurchase() throws Exception {
Inventory inventory = new Inventory();
inventory.addPurchase(mock(Purchase.class));
assertThat(inventory.getAllPurchases()).hasSize(1);
}
