Add test for ParseDuration

BlazorApp.Tests/BlazorApp.Tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net5.0</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+        <PackageReference Include="xunit" Version="2.4.1" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="1.3.0">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\BlazorApp\BlazorApp.csproj" />
+    </ItemGroup>
+
+</Project>

BlazorApp.Tests/CalendarTests.cs

@@ -0,0 +1,41 @@
+using System;
+using Xunit;
+
+namespace BlazorApp.Tests
+{
+    public class CalendarTests
+    {
+        [Fact]
+        public void TestParseDuration()
+        {
+            // 1 week
+            Assert.Equal(Data.Calendar.ParseDuration("P1W"), TimeSpan.FromDays(7));
+            
+            // 1 week and 2 days
+            Assert.Equal(Data.Calendar.ParseDuration("P1W2D"), TimeSpan.FromDays(7 + 2));
+            
+            // 1 day
+            Assert.Equal(Data.Calendar.ParseDuration("P1D"), TimeSpan.FromDays(1));
+            Assert.Equal(Data.Calendar.ParseDuration("-P1D"), TimeSpan.FromDays(-1));
+
+            // 1 day, 5 hours
+            Assert.Equal(Data.Calendar.ParseDuration("P1DT5H"), TimeSpan.FromHours(24 + 5));
+            
+            // 5 hours
+            Assert.Equal(Data.Calendar.ParseDuration("PT5H"), TimeSpan.FromHours(5));
+
+            // 1 hours, 3 minutes, 1 second
+            Assert.Equal(Data.Calendar.ParseDuration("PT1H03M01S"), TimeSpan.FromSeconds(3600 + 3 * 60 + 1));
+            
+            // 3 weeks, 4 days, 1 hour, 3 minutes, 1 second
+            Assert.Equal(
+                Data.Calendar.ParseDuration("P3W4DT1H03M01S"),
+                TimeSpan.FromSeconds(3600 + 3 * 60 + 1) + TimeSpan.FromDays(3 * 7 + 4)
+            );
+            Assert.Equal(
+                Data.Calendar.ParseDuration("-P3W4DT1H03M01S"),
+                -(TimeSpan.FromSeconds(3600 + 3 * 60 + 1) + TimeSpan.FromDays(3 * 7 + 4))
+            );
+        }
+    }
+}

BlazorApp.sln

@@ -5,6 +5,8 @@ VisualStudioVersion = 16.0.31410.357
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BlazorApp", "BlazorApp\BlazorApp.csproj", "{69DC6815-2B48-4DFF-9654-14990236E6E2}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlazorApp.Tests", "BlazorApp.Tests\BlazorApp.Tests.csproj", "{6AD55C0D-0C3A-4E5F-B8F7-4E01CC6D56E7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{69DC6815-2B48-4DFF-9654-14990236E6E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{69DC6815-2B48-4DFF-9654-14990236E6E2}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{69DC6815-2B48-4DFF-9654-14990236E6E2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6AD55C0D-0C3A-4E5F-B8F7-4E01CC6D56E7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6AD55C0D-0C3A-4E5F-B8F7-4E01CC6D56E7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6AD55C0D-0C3A-4E5F-B8F7-4E01CC6D56E7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6AD55C0D-0C3A-4E5F-B8F7-4E01CC6D56E7}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

BlazorApp/Data/Calendar.cs

@@ -47,7 +47,7 @@ namespace BlazorApp.Data
         /// Very non-strict parser of durations as specified in
         /// https://datatracker.ietf.org/doc/html/rfc5545#section-3.3.6
         /// </summary>
-        private static TimeSpan? _parseDuration(string s)
+        public static TimeSpan? ParseDuration(string s)
         {
             var timeSpan = new TimeSpan();
             var positive = s[0] != '-';
@@ -154,7 +154,7 @@ namespace BlazorApp.Data
                         @event.DtEnd = _parseDateTime(value);
                         break;
                     case "DURATION":
-                        @event.Duration = _parseDuration(value);
+                        @event.Duration = ParseDuration(value);
                         break;
                 }
             }