From b4cc918f31195fcb282038a0f2d36a739cd19234 Mon Sep 17 00:00:00 2001
From: Alexander Zeitler <alexander.zeitler@pdmlab.com>
Date: Sat, 29 Apr 2023 16:31:00 +0200
Subject: [PATCH] feat: create timespans from backoff constant method

---
 .../CoreTests/ErrorHandling/BackoffTests.cs   | 26 +++++++++++++++++++
 src/Wolverine/ErrorHandling/Backoff.cs        | 11 ++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 src/Testing/CoreTests/ErrorHandling/BackoffTests.cs
 create mode 100644 src/Wolverine/ErrorHandling/Backoff.cs

diff --git a/src/Testing/CoreTests/ErrorHandling/BackoffTests.cs b/src/Testing/CoreTests/ErrorHandling/BackoffTests.cs
new file mode 100644
index 000000000..8e9478402
--- /dev/null
+++ b/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);
+    }
+}
\ No newline at end of file
diff --git a/src/Wolverine/ErrorHandling/Backoff.cs b/src/Wolverine/ErrorHandling/Backoff.cs
new file mode 100644
index 000000000..5092b3bc7
--- /dev/null
+++ b/src/Wolverine/ErrorHandling/Backoff.cs
@@ -0,0 +1,11 @@
+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));
+    }
+}
\ No newline at end of file