TestsController.cs

[HttpGet]
public async Task<ActionResult<IEnumerable<TestCase>>> GetTestCase()
{
    return await _context.TestCase.ToListAsync();
}

[HttpGet("passing")]
public async Task<ActionResult<IEnumerable<TestCase>>> GetPassingTestCases()
{
    return await GetTestCasesByStatusAsync(TestStatus.Passing);
}

[HttpGet("failed")]
public async Task<ActionResult<IEnumerable<TestCase>>> GetFailedTestCases()
{
    return await GetTestCasesByStatusAsync(TestStatus.Failed);
}

[HttpGet("pending")]
public async Task<ActionResult<IEnumerable<TestCase>>> GetPendingTestCases()
{
    return await GetTestCasesByStatusAsync(TestStatus.NotRun);
}

private async Task<List<TestCase>> GetTestCasesByStatusAsync(TestStatus status)
{
    return await _context.TestCase.Where(t => t.Status == status).ToListAsync();
}