WIP: create timespans from backoff class methods

src/Testing/CoreTests/ErrorHandling/BackoffTests.cs

@@ -0,0 +1,26 @@
+using Wolverine.ErrorHandling;
+using Xunit;
+
+namespace CoreTests.ErrorHandling;
+
+public class BackoffTests
+{
+    [Fact]
+    public void ConstantBackoffWithZeroRetriesShouldByEmpty()
+    {
+        var backoff = Backoff.Constant(10, 0);
+        backoff.ShouldNotBeNull();
+        backoff.Count().ShouldBe(0);
+    }
+
+    [Fact]
+    public void ConstantBackoffWithNonZeroRetriesShouldYieldDelay()
+    {
+        const int maxRetries = 1;
+        const int delay = 10;
+
+        var backoff = Backoff.Constant(delay, maxRetries);
+        backoff.Count().ShouldBe(maxRetries);
+        backoff.First().Milliseconds.ShouldBe(delay);
+    }
+}

src/Wolverine/ErrorHandling/Backoff.cs

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+namespace Wolverine.ErrorHandling;
+
+public class Backoff
+{
+    public static IEnumerable<TimeSpan> Constant(int delay, int maxRetries)
+    {
+        return maxRetries == 0
+            ? new List<TimeSpan>()
+            : Enumerable.Range(1, maxRetries).Select(i => TimeSpan.FromMilliseconds(delay));
+    }
+}