Added sharing a BeyondFacts Lab session with the research team (#1196)

app/Tests/BeyondFactsLab/BflShareMailTests.cs

@@ -0,0 +1,51 @@
+using AIStudio.Assistants.BeyondFactsLab;
+
+namespace AIStudio.Tests.BeyondFactsLab;
+
+/// <summary>
+/// Checks the mailto link with which a person sends a shared session to the research team of the BeyondFacts Lab.
+/// </summary>
+[TestFixture]
+public sealed class BflShareMailTests
+{
+    [Test]
+    public void TheLinkNamesTheResearchTeamAndItsSubject() => Assert.That(BflShareMail.CreateUri(), Does.StartWith($"mailto:{BflShareMail.RECIPIENT}?subject="));
+
+    [Test]
+    public void TheSubjectAndTheTextAreEncoded()
+    {
+        var uri = BflShareMail.CreateUri("team@example.org", "Müller & Co? 1+1", "Grüße\nund Dank");
+
+        Assert.That(uri, Is.EqualTo("mailto:team@example.org?subject=M%C3%BCller%20%26%20Co%3F%201%2B1&body=Gr%C3%BC%C3%9Fe%0D%0Aund%20Dank"));
+    }
+
+    [TestCase("Eins\nZwei")]
+    [TestCase("Eins\r\nZwei")]
+    [TestCase("Eins\rZwei")]
+    public void EveryLineBreakIsCrLf(string body) => Assert.That(BflShareMail.CreateUri("team@example.org", "Betreff", body), Does.EndWith("&body=Eins%0D%0AZwei"));
+
+    [Test]
+    public void ALongTextLosesItsEndAtAWord()
+    {
+        var body = string.Join(' ', Enumerable.Repeat("Wörter", 600));
+        var uri = BflShareMail.CreateUri("team@example.org", "Betreff", body);
+        var text = Uri.UnescapeDataString(uri[(uri.IndexOf("&body=", StringComparison.Ordinal) + "&body=".Length)..]);
+
+        using (Assert.EnterMultipleScope())
+        {
+            Assert.That(uri.Length, Is.LessThanOrEqualTo(BflShareMail.MAX_URI_LENGTH));
+            Assert.That(body, Does.StartWith(text));
+            Assert.That(text, Does.EndWith("Wörter"));
+        }
+    }
+
+    [Test]
+    public void TheTextOfTheLabFitsTheLimit() => Assert.That(BflShareMail.CreateUri(), Does.Contain("&body=").And.Length.LessThanOrEqualTo(BflShareMail.MAX_URI_LENGTH));
+
+    [Test]
+    public void TheTextOfTheLabHasCrLfOnly()
+    {
+        var uri = BflShareMail.CreateUri();
+        Assert.That(uri.Replace("%0D%0A", string.Empty), Does.Not.Contain("%0A").And.Not.Contain("%0D"));
+    }
+}