Test: Introduce file-based recurrence test cases with an example test.

Author: minichma

Ical.Net.Tests/Calendars/Recurrence/RecurrenceTestCases.txt

@@ -0,0 +1,4 @@
+# Monday to Friday
+RRULE:FREQ=WEEKLY;BYDAY=MO,TH;COUNT=3
+DTSTART:20241024
+INSTANCES:20241024,20241028,20241031

Ical.Net.Tests/Ical.Net.Tests.csproj

@@ -17,7 +17,7 @@
         <ProjectReference Include="..\Ical.Net\Ical.Net.csproj" />
     </ItemGroup>
     <ItemGroup>
-        <EmbeddedResource Include="Calendars\**\*.ics" />
+        <EmbeddedResource Include="Calendars\**\*" />
     </ItemGroup>
     <ItemGroup>
       <EmbeddedResource Include="contrib\libical\icalrecur_test.out" />

Ical.Net.Tests/IcsFiles.cs

@@ -159,6 +159,8 @@ internal static string ReadStream(string manifestResource)
         internal static string YearlyCountByYearDay1 => ReadStream("Ical.Net.Tests.Calendars.Recurrence.YearlyCountByYearDay1.ics");
         internal static string YearlyInterval1 => ReadStream("Ical.Net.Tests.Calendars.Recurrence.YearlyInterval1.ics");
 
+        internal static string RecurrrenceTestCases => ReadStream("Ical.Net.Tests.Calendars.Recurrence.RecurrenceTestCases.txt");
+
         internal static string LibicalIcalrecurTest => ReadStream("Ical.Net.Tests.contrib.libical.icalrecur_test.out");
 
     }

Ical.Net.Tests/RecurrenceTests.cs

@@ -3758,6 +3758,13 @@ private static IEnumerable<RecurrenceTestCase> TestLibicalTestCasesSource
         public void TestLibicalTestCases(RecurrenceTestCase testCase)
             => ExecuteRecurrenceTestCase(testCase);
 
+        private static IEnumerable<RecurrenceTestCase> TestFileBasedRecurrenceTestCaseSource
+            => ParseTestCaseFile(IcsFiles.RecurrrenceTestCases);
+
+        [TestCaseSource(nameof(TestFileBasedRecurrenceTestCaseSource))]
+        public void TestFileBasedRecurrenceTestCase(RecurrenceTestCase testCase)
+            => ExecuteRecurrenceTestCase(testCase);
+
         public void ExecuteRecurrenceTestCase(RecurrenceTestCase testCase)
         {
             Calendar cal = new Calendar();