Verifying the value of an argument passed to a method

In this example, I want to verify that the correct partial view was passed to the method that renders partials to strings. Here is the method:

public async Task<IActionResult> OnGetLedgerAsPdfAsync([FromServices] IPdfConverter pdfConverter)
{
    if (authService.Allows(User, To.PrintLedger))
    {
        var entries = await orderService.GetLedgerAsync(IssueId, OrderItemIds, At);
        entries = entries.Where(x => x.Confirmed).ToList();
        var html = await renderer.RenderPartialToStringAsync("/Pages/Ledger/_LedgerPdfPartial.cshtml", entries);
        var fileName = $"{entries.First().ProductName} {new DateTime(entries.First().Year, entries.First().Month, 1):MMM yyyy} Ledger.pdf";
        return File(pdfConverter.ToPortraitPdf(html, BaseHref), MediaTypeNames.Application.Pdf, fileName);
    }
    return Forbid();
}

Here is the test:

[Fact]
public async Task OnGetLedgerAsPdfAsync_ReturnsFileContentResult_ForAuthorisedUser()
{
    // Arrange
    authService.Setup(x => x.Allows(It.IsAny<ClaimsPrincipal>(), To.PrintLedger)).Returns(true);
    var ledgerEntries = new List<LedgerEntry> {
        new() { Confirmed = true, ProductName = "Test Product", Year = 2024, Month = 8 }
    };
    orderService.Setup(x => x.GetLedgerAsync(It.IsAny<int>(), It.IsAny<int[]>(), It.IsAny<DateTime?>())).ReturnsAsync(ledgerEntries);
        // Act
    var result = await indexModel.OnGetLedgerAsPdfAsync(Mock.Of<IPdfConverter>());

    // Assert
    Assert.IsType<FileContentResult>(result);
    orderService.Verify(x => x.GetLedgerAsync(It.IsAny<int>(),It.IsAny<int[]>(), It.IsAny<DateTime?>()), Times.Once);
    renderer.Verify(x => x.RenderPartialToStringAsync("/Pages/Ledger/_LedgerPdfPartial.cshtml", ledgerEntries, null), Times.Once);
    Assert.IsType<FileContentResult>(result);
    Assert.Equal(MediaTypeNames.Application.Pdf, ((FileContentResult)result).ContentType);
    Assert.Equal("Test Product Aug 2024 Ledger.pdf", ((FileContentResult)result).FileDownloadName);
}

So we verified that the order service was called with any values as arguments (using the It.IsAny placeholder), but we ensured that the renderer's RenderPartialToStringAsync method was called with specific argument values.