Added progress messages and quick access to exported files (#1112)

app/Tests/Components/ElapsedTimeTests.cs

@@ -0,0 +1,28 @@
+using AIStudio.Components;
+
+namespace AIStudio.Tests.Components;
+
+/// <summary>
+/// Checks how the time below the progress bar of an assistant is written.
+/// </summary>
+/// <remarks>
+/// Minutes and seconds suffice for almost every run; the hours come in front only once there are any,
+/// and they keep counting past a day instead of starting over.
+/// </remarks>
+[TestFixture]
+public sealed class ElapsedTimeTests
+{
+    [TestCase(0, ExpectedResult = "0:00")]
+    [TestCase(9, ExpectedResult = "0:09")]
+    [TestCase(61, ExpectedResult = "1:01")]
+    [TestCase(59 * 60 + 59, ExpectedResult = "59:59")]
+    [TestCase(60 * 60, ExpectedResult = "1:00:00")]
+    [TestCase(25 * 60 * 60 + 3 * 60 + 4, ExpectedResult = "25:03:04")]
+    public string ATimeSpanIsWrittenAsMinutesAndSecondsWithHoursWhereThereAreAny(int seconds) => ElapsedTime.Format(TimeSpan.FromSeconds(seconds));
+
+    [Test]
+    public void ANegativeTimeSpanCountsAsNone() => Assert.That(ElapsedTime.Format(TimeSpan.FromSeconds(-5)), Is.EqualTo("0:00"), "A clock which was set back must not show a negative time.");
+
+    [Test]
+    public void FractionsOfASecondAreCutOff() => Assert.That(ElapsedTime.Format(TimeSpan.FromMilliseconds(1_999)), Is.EqualTo("0:01"));
+}