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Fuzzy Checks with Some and Any Values

[block:callout] { "type": "info", "title": "NOTE", "body": "The techniques shown here only work with lambda-based partial matching. They do not work with anonymous objects." } [/block] The ShouldLookLike assertion also allows you to do fuzzy matching. For example, you can check to make sure that a property isn't null: [block:code] { "codes": [ { "code": " [Test]\n public void then_you_can_check_for_non_null_values()\n {\n var engine = new Engine { Maker = \"Heroic\" };\n engine.ShouldLookLike(() => new Engine\n {\n Maker = Any.NonNullValueOf<string>()\n });\n }", "language": "csharp" } ] } [/block] You can also check for a specific value in a range: [block:code] { "codes": [ { "code": " [Test]\n public void then_you_can_check_for_values_in_a_range()\n {\n var engine = new Engine {YearBuilt = 2015};\n engine.ShouldLookLike(() => new Engine\n {\n YearBuilt = Some.ValueInRange(2014, 2016)\n });\n }", "language": "csharp" } ] } [/block] Or for a value matching some arbitrary criteria: [block:code] { "codes": [ { "code": " [Test]\n public void then_you_can_check_for_a_value_matching_some_expression()\n {\n var engine = new Engine {Maker = \"Heroic\"};\n engine.ShouldLookLike(() => new Engine\n {\n Maker = Some.ValueOf<string>(s => char.IsUpper(s[0]))\n });\n }", "language": "csharp" } ] } [/block] You can also check to make sure a list contains some value (or even a *partial* value!) [block:code] { "codes": [ { "code": " [Test]\n public void then_you_can_check_for_an_item_in_a_list()\n {\n var warehouse = new Warehouse\n {\n Engines = new[] {new Engine {YearBuilt = 2013}, new Engine {YearBuilt = 2016}}\n };\n\n warehouse.ShouldLookLike(() => new Warehouse\n {\n Engines = Some.ListContaining(() => new Engine\n {\n //Yep, you can use partial matching recursively!\n YearBuilt = Some.ValueOf<int>(i => i % 2 == 0)\n })\n });\n }", "language": "csharp" } ] } [/block]