Use Assert.Equal in calculator example tests

[Arash-Sabet]

Summary

• replace Assert.True comparisons with Assert.Equal

Testing

• dotnet test examples/Xunit.Microsoft.DependencyInjection.ExampleTests (fails: dotnet command not found)

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https://chatgpt.com/codex/tasks/task_e_689d407259648333af521a9ecc408ff6

[Copilot]

Pull Request Overview

This PR improves test assertion clarity by replacing Assert.True comparisons with Assert.Equal in calculator example tests. This change provides better test failure messages and follows xUnit best practices for equality assertions.

• Replaced Assert.True(expected == calculatedValue) with Assert.Equal(expected, calculatedValue) in two test methods

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