tests(calendar): Add calendar render tests (#3)

- updates calendar to support overriding the current day when rendering
- supports current culture when rendering
- renames Calendar to CalendarGenerator

tests/ModuleTests/Calendar/BasicRenderTest.cs

@@ -0,0 +1,48 @@
+using ModuleCore.Calendar;
+using ModuleTests.Calendar.TestData;
+using System.Globalization;
+
+namespace ModuleTests.Calendar;
+
+public class BasicRenderTest
+{
+	private static readonly VerifySettings Settings;
+
+	static BasicRenderTest()
+	{
+		Settings = new VerifySettings();
+		var testBaseDirectory = Path.Join(TestConstants.SnapshotFolderName, nameof(BasicRenderTest));
+
+		Settings.UseDirectory(testBaseDirectory);
+		Settings.DisableDiff();
+	}
+
+	[Theory]
+	[ClassData(typeof(CalendarTestDates))]
+	public Task BasicCalendarRender(DateTime month)
+	{
+		Settings.UseFileName($"{month:yyyy-MM-dd}");
+
+		var calendar = new CalendarGenerator();
+		// Render the calendar with the start of the month as the today date so no elapsed marks are shown
+		var renderedMonth = calendar.Render(month, new DateTime(month.Year, month.Month, 1));
+
+		return Verify(renderedMonth, Settings);
+	}
+
+	[Theory]
+	[ClassData(typeof(CultureCodeTestData))]
+	public Task CultureInfoCalendarRender(string cultureCode)
+	{
+		Settings.UseFileName($"{cultureCode}");
+
+		Thread.CurrentThread.CurrentCulture = new CultureInfo(cultureCode);
+
+		var month = new DateTime(2026, 8, 1);
+		var calendar = new CalendarGenerator();
+		// Render the calendar with the start of the month as the today date so no elapsed marks are shown
+		var renderedMonth = calendar.Render(month, new DateTime(month.Year, month.Month, 1));
+
+		return Verify(renderedMonth, Settings);
+	}
+}