How to use CustomConstraint class of NUnit.Framework.Syntax package

Best Nunit code snippet using NUnit.Framework.Syntax.CustomConstraint

ArbitraryConstraintMatching.cs

Source:ArbitraryConstraintMatching.cs Github

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...9{10 [TestFixture]11 public class ArbitraryConstraintMatching12 {13 Constraint custom = new CustomConstraint();14 Constraint another = new AnotherConstraint();15 [Test]16 public void CanMatchCustomConstraint()17 {18 IResolveConstraint constraint = new ConstraintExpression().Matches(custom);19 Assert.That(constraint.Resolve().ToString(), Is.EqualTo("<custom>"));20 }21 [Test]22 public void CanMatchCustomConstraintAfterPrefix()23 {24 IResolveConstraint constraint = Is.All.Matches(custom);25 Assert.That(constraint.Resolve().ToString(), Is.EqualTo("<all <custom>>"));26 }27 [Test]28 public void CanMatchCustomConstraintsUnderAndOperator()29 {30 IResolveConstraint constraint = Is.All.Matches(custom).And.Matches(another);31 Assert.That(constraint.Resolve().ToString(), Is.EqualTo("<all <and <custom> <another>>>"));32 }33#if CLR_2_0 || CLR_4_034 [Test]35 public void CanMatchPredicate()36 {37 IResolveConstraint constraint = new ConstraintExpression().Matches(new Predicate<int>(IsEven));38 Assert.That(constraint.Resolve().ToString(), Is.EqualTo("<predicate>"));39 Assert.That(42, constraint);40 }41 bool IsEven(int num)42 {43 return (num & 1) == 0;44 }45#if CS_3_0 || CS_4_0 || CS_5_046 [Test]47 public void CanMatchLambda()48 {49 IResolveConstraint constraint = new ConstraintExpression().Matches<int>( (x) => (x & 1) == 0);50 Assert.That(constraint.Resolve().ToString(), Is.EqualTo("<predicate>"));51 Assert.That(42, constraint);52 }53#endif54#endif55 class CustomConstraint : Constraint56 {57 public override bool Matches(object actual)58 {59 throw new NotImplementedException();60 }61 public override void WriteDescriptionTo(MessageWriter writer)62 {63 throw new NotImplementedException();64 }65 }66 class AnotherConstraint : CustomConstraint67 {68 }69 }70}...

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CustomConstraint

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1using NUnit.Framework.Syntax;2using NUnit.Framework;3using System;4{5 {6 public void TestCustomConstraintMethod()7 {8 string str = "Hello World";9 Assert.That(str, new CustomConstraint());10 }11 }12}13using NUnit.Framework.Syntax;14using NUnit.Framework;15using System;16{17 {18 public override bool Matches(object actual)19 {20 if (actual is string)21 {22 if (actual.ToString().Contains("Hello"))23 {24 return true;25 }26 }27 return false;28 }29 public override void WriteDescriptionTo(MessageWriter writer)30 {31 writer.WritePredicate("Hello");32 }33 }34}

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CustomConstraint

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1using NUnit.Framework;2{3 {4 public void TestEmail1()5 {6 Assert.That("

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