public MainWindowTests() { craftingMaterial = new CraftingMaterial { Name = "test-crafting-material-1", SourceType = SourceType.Mining, Location = "location-1" }; craftingMaterials.Add(craftingMaterial as CraftingMaterial); craftingItems.Add(BuildCraftingItem(TestCraftingItemName)); initialDataService.GetCraftingItems().Returns(craftingItems); initialDataService.GetCraftingMaterials().Returns(craftingMaterials); }