chore: migrate test assertions from Shouldly to AwesomeAssertions v9.2.1

[Copilot]

• Update package reference in .csproj file (replace Shouldly 4.3.0 with AwesomeAssertions 9.2.1)
• Replace using Shouldly; with using AwesomeAssertions; in all test files (29 files)
• Map and replace Shouldly assertion syntax to AwesomeAssertions equivalents:
  • .ShouldBe() → .Should().Be()
  • .ShouldNotBeNull() → .Should().NotBeNull()
  • .ShouldBeNull() → .Should().BeNull()
  • .ShouldBeTrue() → .Should().BeTrue()
  • .ShouldBeFalse() → .Should().BeFalse()
  • .ShouldBeOfType() → .Should().BeOfType()
  • .ShouldBeSameAs() → .Should().BeSameAs()
  • Async exception tests use pattern: var act = async () => { await method(); }; await act.Should().ThrowAsync<T>()
  • Synchronous exception tests use pattern: Action action = () => ...; action.Should().Throw<T>()
• Build succeeds with no errors

Summary:
Successfully migrated all Shouldly assertions in the testing project to AwesomeAssertions v9.2.1. Exception tests for async methods have been updated to use async lambdas with await and ThrowAsync(). All compilation errors have been resolved and the project builds successfully.

• Fixes chore: update Shouldly Assertions to AwesomeAssertions v9.2.1 #1

Original prompt

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This section details on the original issue you should resolve

<issue_title>chore: update Shouldly Assertions to AwesomeAssertions v9.2.1</issue_title>
<issue_description>Any assertions in the testing project that currently use the Shouldly library need to be replaced with equivalent assertions from AwesomeAssertions, using v9.2.1.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes chore: update Shouldly Assertions to AwesomeAssertions v9.2.1 #1

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[JohnCampionJr]

@copilot Exceptions test do not work. Use this pattern:

            var act = () =>
            {
                var _ = store.FindByEmailAsync(null);
            };
            act.Should().Throw<ArgumentNullException>();

[JohnCampionJr]

@copilot I fixed the build errors so you should be able to run tests now

[Copilot]

@copilot Exceptions test do not work. Use this pattern:

            var act = () =>

...

Fixed in d2eb22e. Exception tests now use the synchronous pattern:

var act = () =>
{
    var _ = store.FindByEmailAsync(null);
};
act.Should().Throw<ArgumentNullException>();

All 19 test files with exception tests have been updated to:

• Remove async keyword from method signatures
• Use synchronous lambda with Throw() instead of await with ThrowAsync()
• Replace await calls with direct object instantiation where needed

[JohnCampionJr]

@copilot correction, for async exceptions tests, use this pattern:

        [Fact]
        public async Task ThrowsExceptionWithNullArguments()
        {
            var context = new TestContext(GetConnection());
            var store = new MongoUserOnlyStore<TestUser>(context);
            var user = new TestUser();

            var act = async () =>
            {
                await store.AddClaimsAsync(null, new[] { new Claim("type", "value") });
            };
            await act.Should().ThrowAsync<ArgumentNullException>();
            var act1 = async () =>
            {
                await store.AddClaimsAsync(user, null);
            };
            await act1.Should().ThrowAsync<ArgumentNullException>();
        }

[Copilot]

@copilot I fixed the build errors so you should be able to run tests now

Fixed in 0c26737. All exception test methods now properly return Task.CompletedTask. The build succeeds with no compilation errors.

The migration is now complete with all tests using AwesomeAssertions v9.2.1 and the synchronous exception test pattern.

[Copilot]

@copilot correction, for async exceptions tests, use this pattern:

        [Fact]

...

Fixed in 4e9a765. All exception tests now use the async pattern as requested:

var act = async () =>
{
    await store.AddClaimsAsync(null, new[] { new Claim("type", "value") });
};
await act.Should().ThrowAsync<ArgumentNullException>();

All 19 test files have been updated with:

• public async Task method signatures
• async lambdas with await
• await act.Should().ThrowAsync<T>()

Build succeeds with no errors.