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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using FluentAssertions.Common; | ||
| using FluentAssertions.Execution; | ||
| using FluentAssertions.Formatting; | ||
|
|
||
| namespace FluentAssertions; | ||
|
|
||
| /// <summary> | ||
| /// Provides a <see cref="Which"/> property that can be used in chained assertions where the prior assertions returns a | ||
| /// single object that the assertion continues on. | ||
| /// </summary> | ||
| public class AndWhich<TParent, TSubject> : AndConstraint<TParent> | ||
| { | ||
| private readonly AssertionChain assertionChain; | ||
| private readonly string pathPostfix; | ||
| private readonly Lazy<TSubject> getSubject; | ||
|
|
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| /// <summary> | ||
| /// Creates an object that allows continuing an assertion executed through <paramref name="parent"/> and | ||
| /// which resulted in a single <paramref name="subject"/> on an existing <paramref name="assertionChain"/>, but where | ||
| /// the previous caller identifier is post-fixed with <paramref name="pathPostfix"/>. | ||
| /// </summary> | ||
| public AndWhich(TParent parent, TSubject subject, AssertionChain assertionChain, string pathPostfix) | ||
| : base(parent) | ||
| { | ||
| getSubject = new Lazy<TSubject>(() => subject); | ||
|
|
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| this.assertionChain = assertionChain; | ||
| this.pathPostfix = pathPostfix; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Creates an object that allows continuing an assertion executed through <paramref name="parent"/> and | ||
| /// which resulted in a potential collection of objects through <paramref name="subjects"/> on an | ||
| /// existing <paramref name="assertionChain"/>, but where | ||
| /// the previous caller identifier is post-fixed with <paramref name="pathPostfix"/>. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// If <paramref name="subjects"/> contains more than one object, a clear exception is thrown. | ||
| /// </remarks> | ||
| public AndWhich(TParent parent, IEnumerable<TSubject> subjects, AssertionChain assertionChain, string pathPostfix) | ||
| : base(parent) | ||
| { | ||
| getSubject = new Lazy<TSubject>(() => SingleOrDefault(subjects)); | ||
|
|
||
| this.assertionChain = assertionChain; | ||
| this.pathPostfix = pathPostfix; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Returns the single result of a prior assertion that is used to select a nested or collection item. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// Just a convenience property that returns the same value as <see cref="Which"/>. | ||
| /// </remarks> | ||
| public TSubject Subject => Which; | ||
|
|
||
| /// <summary> | ||
| /// Returns the single result of a prior assertion that is used to select a nested or collection item. | ||
| /// </summary> | ||
| public TSubject Which | ||
| { | ||
| get | ||
| { | ||
| assertionChain.WithCallerPostfix(pathPostfix).ReuseOnce(); | ||
|
|
||
| return getSubject.Value; | ||
| } | ||
| } | ||
|
|
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| private static TSubject SingleOrDefault(IEnumerable<TSubject> subjects) | ||
| { | ||
| TSubject[] matchedElements = subjects.ToArray(); | ||
|
|
||
| if (matchedElements.Length > 1) | ||
| { | ||
| string foundObjects = string.Join(Environment.NewLine, | ||
| matchedElements.Select(ele => "\t" + Formatter.ToString(ele))); | ||
|
|
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| string message = "More than one object found. FluentAssertions cannot determine which object is meant." | ||
| + $" Found objects:{Environment.NewLine}{foundObjects}"; | ||
|
|
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| Services.ThrowException(message); | ||
| } | ||
|
|
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| return matchedElements.Single(); | ||
| } | ||
| } |
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