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fluentassertions · Nov 13, 2021 · cdfcadd · cdfcadd
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diff --git a/Src/FluentAssertions/Equivalency/EquivalencyAssertionOptions.cs b/Src/FluentAssertions/Equivalency/EquivalencyAssertionOptions.cs
@@ -2,9 +2,11 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq.Expressions;
 using FluentAssertions.Common;
 using FluentAssertions.Equivalency.Execution;
+using FluentAssertions.Equivalency.Matching;
 using FluentAssertions.Equivalency.Ordering;
 using FluentAssertions.Equivalency.Selection;
 
@@ -70,6 +72,42 @@ public EquivalencyAssertionOptions<IEnumerable<TExpectation>> AsCollection()
             return new EquivalencyAssertionOptions<IEnumerable<TExpectation>>(
                 new CollectionMemberAssertionOptionsDecorator(this));
         }
+
+        public EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(
+            Expression<Func<TExpectation, object>> expectationPropertyPath,
+            Expression<Func<TSubject, object>> subjectPropertyPath)
+        {
+            return WithMapping(
+                expectationPropertyPath.GetMemberPath().ToString(),
+                subjectPropertyPath.GetMemberPath().ToString());
+        }
+
+        public EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(
+            Expression<Func<TNestedExpectation, object>> expectationProperty,
+            Expression<Func<TNestedSubject, object>> subjectProperty)
+        {
+            return WithMapping<TNestedExpectation, TNestedSubject>(
+                expectationProperty.GetMemberPath().ToString(),
+                subjectProperty.GetMemberPath().ToString());
+        }
+
+        public EquivalencyAssertionOptions<TExpectation> WithMapping(
+            string expectationPropertyPath,
+            string subjectPropertyPath)
+        {
+            AddMatchingRule(new MappedMemberMatchingRule(expectationPropertyPath, subjectPropertyPath));
+
+            return this;
+        }
+
+        public EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(
+            string expectationPropertyName,
+            string subjectPropertyName)
+        {
+            AddMatchingRule(new MappedMemberMatchingRule(typeof(TNestedExpectation), expectationPropertyName, typeof(TNestedSubject), subjectPropertyName));
+
+            return this;
+        }
     }
 
     /// <summary>

diff --git a/Src/FluentAssertions/Equivalency/Matching/MappedMemberMatchingRule.cs b/Src/FluentAssertions/Equivalency/Matching/MappedMemberMatchingRule.cs
@@ -0,0 +1,39 @@
+
+// <auto-generated/>
+using System;
+
+namespace FluentAssertions.Equivalency.Matching
+{
+    internal class MappedMemberMatchingRule : IMemberMatchingRule
+    {
+        private readonly string expectationPropertyPath;
+        private readonly string subjectPropertyPath;
+        private Type nestedExpectationType = null;
+        private Type nestedSubjectType = null;
+
+        public MappedMemberMatchingRule(string expectationPropertyPath, string subjectPropertyPath)
+        {
+            // TODO: What if the property path is empty or null?
+            // TODO: What if the two paths have a different parent?
+
+            this.expectationPropertyPath = expectationPropertyPath;
+            this.subjectPropertyPath = subjectPropertyPath;
+        }
+
+        public MappedMemberMatchingRule(Type expectationType, string expectationPropertyName, Type subjectType, string subjectPropertyName)
+        {
+            // TODO: What if the property is more than just a member name
+
+            nestedExpectationType = expectationType;
+            nestedSubjectType = subjectType;
+        }
+
+        public IMember Match(IMember expectedMember, object subject, INode parent, IEquivalencyAssertionOptions options)
+        {
+            if (MatchesExpectation(expectedMember))
+            {
+
+            }
+        }
+    }
+}
diff --git a/Src/FluentAssertions/Equivalency/SelfReferenceEquivalencyAssertionOptions.cs b/Src/FluentAssertions/Equivalency/SelfReferenceEquivalencyAssertionOptions.cs
@@ -820,7 +820,7 @@ protected TSelf AddSelectionRule(IMemberSelectionRule selectionRule)
             return (TSelf)this;
         }
 
-        private TSelf AddMatchingRule(IMemberMatchingRule matchingRule)
+        protected TSelf AddMatchingRule(IMemberMatchingRule matchingRule)
         {
             matchingRules.Insert(0, matchingRule);
             return (TSelf)this;

diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/net47.verified.txt
@@ -751,6 +751,10 @@ namespace FluentAssertions.Equivalency
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<System.Collections.Generic.IEnumerable<TExpectation>> AsCollection() { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Excluding(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Including(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping(string expectationPropertyPath, string subjectPropertyPath) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(System.Linq.Expressions.Expression<System.Func<TNestedExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TNestedSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(string expectationPropertyName, string subjectPropertyName) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithStrictOrderingFor(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
     }
     public enum EquivalencyResult

diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp2.1.verified.txt
@@ -751,6 +751,10 @@ namespace FluentAssertions.Equivalency
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<System.Collections.Generic.IEnumerable<TExpectation>> AsCollection() { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Excluding(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Including(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping(string expectationPropertyPath, string subjectPropertyPath) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(System.Linq.Expressions.Expression<System.Func<TNestedExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TNestedSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(string expectationPropertyName, string subjectPropertyName) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithStrictOrderingFor(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
     }
     public enum EquivalencyResult

diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netcoreapp3.0.verified.txt
@@ -751,6 +751,10 @@ namespace FluentAssertions.Equivalency
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<System.Collections.Generic.IEnumerable<TExpectation>> AsCollection() { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Excluding(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Including(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping(string expectationPropertyPath, string subjectPropertyPath) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(System.Linq.Expressions.Expression<System.Func<TNestedExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TNestedSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(string expectationPropertyName, string subjectPropertyName) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithStrictOrderingFor(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
     }
     public enum EquivalencyResult

diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.0.verified.txt
@@ -744,6 +744,10 @@ namespace FluentAssertions.Equivalency
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<System.Collections.Generic.IEnumerable<TExpectation>> AsCollection() { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Excluding(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Including(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping(string expectationPropertyPath, string subjectPropertyPath) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(System.Linq.Expressions.Expression<System.Func<TNestedExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TNestedSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(string expectationPropertyName, string subjectPropertyName) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithStrictOrderingFor(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
     }
     public enum EquivalencyResult

diff --git a/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt b/Tests/Approval.Tests/ApprovedApi/FluentAssertions/netstandard2.1.verified.txt
@@ -751,6 +751,10 @@ namespace FluentAssertions.Equivalency
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<System.Collections.Generic.IEnumerable<TExpectation>> AsCollection() { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Excluding(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> Including(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping(string expectationPropertyPath, string subjectPropertyPath) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TSubject>(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(System.Linq.Expressions.Expression<System.Func<TNestedExpectation, object>> expectationProperty, System.Linq.Expressions.Expression<System.Func<TNestedSubject, object>> subjectProperty) { }
+        public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithMapping<TNestedExpectation, TNestedSubject>(string expectationPropertyName, string subjectPropertyName) { }
         public FluentAssertions.Equivalency.EquivalencyAssertionOptions<TExpectation> WithStrictOrderingFor(System.Linq.Expressions.Expression<System.Func<TExpectation, object>> expression) { }
     }
     public enum EquivalencyResult