Remove AwesomeAssertions, use TUnit built-in assertions

[BenjaminMichaelis]

TUnit ships its own async fluent assertion API so AwesomeAssertions is an unnecessary dependency that can be dropped.

What changed

• Removed AwesomeAssertions from Directory.Packages.props and TrxLib.Tests.csproj.
• Migrated all three test files to TUnit's native assertions:
  • x.Should().Be(y) -> await Assert.That(x).IsEqualTo(y)
  • x.Should().Contain(y) -> await Assert.That(x).Contains(y)
  • x.Should().HaveCount(n) -> await Assert.That(x).HasCount(n)
  • x.Should().ContainSingle(pred) -> await Assert.That(x).HasSingleItem(pred)
  • x.Should().NotBeNull() / .BeNull() -> await Assert.That(x).IsNotNull() / .IsNull()
  • act.Should().NotThrow<T>() -> direct invocation (TUnit surfaces exceptions automatically)
  • AssertionScope blocks -> sequential await Assert.That(...) calls
• All void test methods that now use await were updated to async Task.

All 65 tests pass after the migration.

[Copilot]

Pull request overview

Removes the AwesomeAssertions package and migrates all test assertions to TUnit's built-in async fluent assertion API. Test methods that now await an assertion were converted from void to async Task.

Changes:

• Drops the AwesomeAssertions package reference from Directory.Packages.props and TrxLib.Tests.csproj.
• Rewrites all Should()-style assertions in three test files to await Assert.That(...) form, including replacing AssertionScope usage with sequential awaits.
• Converts affected void test methods to async Task signatures.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Directory.Packages.props	Removes the centralized AwesomeAssertions package version entry.
TrxLib.Tests/TrxLib.Tests.csproj	Removes the AwesomeAssertions package reference.
TrxLib.Tests/TrxParserTests.cs	Migrates all assertions to TUnit; converts tests to async Task; replaces ContainEquivalentOf with Contains and drops a because reason on one assertion.
TrxLib.Tests/TrxParserRegressionTests.cs	Migrates assertions to TUnit and makes tests async Task.
TrxLib.Tests/TestResultTests.cs	Migrates assertions to TUnit, replaces AssertionScope with sequential awaits, and reduces the NotThrow<T>() assertion to a bare invocation.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.