Verify conversion kinds in native int conversion tests

[jcouv]

Test plan #60578

I recommend github.dev for presenting a minimal diff: https://github.dev/dotnet/roslyn/pull/60895

[cston]

        private ConversionKind[] kinds;

readonly

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In reply to: 1105964941

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7290 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[cston]

        public static ExpectedConversion Identity = ConversionKind.Identity;

readonly for each of the static fields.

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In reply to: 1105965012

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7292 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[cston]

        public void AssertMatches(Conversion conversion)

Consider calling this bool Equals(Conversion) and let the caller assert, so that this helper class is independent of the test framework.

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In reply to: 1105968021

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In reply to: 1105968021

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7327 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[jcouv]

        public void AssertMatches(Conversion conversion)

It's actually better to assert here, because the Assert.Equal on enumerables prints out the actual list. Since I'm going to re-use this helper for new tests, that'll be helpful.

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In reply to: 1105968021

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7327 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[cston]

    internal class ExpectedConversion

Could we use Conversion (or ConversionKind) directly rather than introducing a new type?

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In reply to: 1105977264

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7288 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[jcouv]

    internal class ExpectedConversion

I don't mind. Switched to ConversionKind[]

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In reply to: 1105977264

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:7288 in 5a2ad5e. [](commit_id = 5a2ad5e, deletion_comment = False)

[cston]

using System.Diagnostics;

Is this used?

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Refers to: src/Compilers/CSharp/Test/Semantic/Semantics/NativeIntegerTests.cs:21 in f26191f. [](commit_id = f26191f, deletion_comment = False)