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RetrierTest.cs
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RetrierTest.cs
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using System;
using System.Threading;
using System.Threading.Tasks;
using FluentAssertions;
using ThrottleDebounce;
using Xunit;
namespace Tests;
public class RetrierTest {
[Fact]
public void ActionImmediateSuccess() {
Failer failer = new(0);
Retrier.Attempt(_ => failer.InvokeAction());
failer.InvocationCount.Should().Be(1);
}
[Fact]
public void ActionRetrySuccess() {
Failer failer = new(1);
Retrier.Attempt(_ => failer.InvokeAction(), delay: _ => TimeSpan.Zero);
failer.InvocationCount.Should().Be(2);
}
[Fact]
public void ActionRetryFailure() {
Failer failer = new(2);
Action thrower = () => Retrier.Attempt(_ => failer.InvokeAction(), delay: _ => TimeSpan.FromMilliseconds(1));
thrower.Should().ThrowExactly<Failure>();
failer.InvocationCount.Should().Be(2);
}
[Fact]
public void ActionRetryNotAllowed() {
Failer failer = new(1);
Action thrower = () => Retrier.Attempt(_ => failer.InvokeAction(), isRetryAllowed: _ => false);
thrower.Should().ThrowExactly<Failure>();
failer.InvocationCount.Should().Be(1);
}
[Fact]
public void FuncImmediateSuccess() {
Failer failer = new(0);
Retrier.Attempt(_ => failer.InvokeFunc());
failer.InvocationCount.Should().Be(1);
}
[Fact]
public void FuncRetrySuccess() {
Failer failer = new(1);
Retrier.Attempt(_ => failer.InvokeFunc());
failer.InvocationCount.Should().Be(2);
}
[Fact]
public void FuncRetryFailure() {
Failer failer = new(2);
Func<bool> thrower = () => Retrier.Attempt(_ => failer.InvokeFunc(), delay: _ => TimeSpan.FromMilliseconds(1));
thrower.Should().ThrowExactly<Failure>();
failer.InvocationCount.Should().Be(2);
}
[Fact]
public void FuncRetryNotAllowed() {
Failer failer = new(1);
Func<bool> thrower = () => Retrier.Attempt(_ => failer.InvokeFunc(), isRetryAllowed: _ => false);
thrower.Should().ThrowExactly<Failure>();
failer.InvocationCount.Should().Be(1);
}
[Fact]
public async Task AsyncActionImmediateSuccess() {
Failer failer = new(0);
await Retrier.Attempt(async _ => await failer.InvokeActionAsync());
failer.InvocationCount.Should().Be(1);
}
[Fact]
public async Task AsyncActionRetrySuccess() {
Failer failer = new(1);
await Retrier.Attempt(async _ => await failer.InvokeActionAsync(), delay: _ => TimeSpan.Zero);
failer.InvocationCount.Should().Be(2);
}
[Fact]
public async Task AsyncActionRetryFailure() {
Failer failer = new(2);
Func<Task> thrower = async () => await Retrier.Attempt(async _ => await failer.InvokeActionAsync(), delay: _ => TimeSpan.FromMilliseconds(1));
await thrower.Should().ThrowExactlyAsync<Failure>();
failer.InvocationCount.Should().Be(2);
}
[Fact]
public async Task AsyncActionRetryNotAllowed() {
Failer failer = new(1);
Func<Task> thrower = async () => await Retrier.Attempt(async _ => await failer.InvokeActionAsync(), isRetryAllowed: _ => false);
await thrower.Should().ThrowExactlyAsync<Failure>();
failer.InvocationCount.Should().Be(1);
}
[Fact]
public async Task AsyncFuncImmediateSuccess() {
Failer failer = new(0);
await Retrier.Attempt(async _ => await failer.InvokeFuncAsync());
failer.InvocationCount.Should().Be(1);
}
[Fact]
public async Task AsyncFuncRetrySuccess() {
Failer failer = new(1);
await Retrier.Attempt(async _ => await failer.InvokeFuncAsync(), delay: _ => TimeSpan.Zero);
failer.InvocationCount.Should().Be(2);
}
[Fact]
public async Task AsyncFuncRetryFailure() {
Failer failer = new(2);
Func<Task> thrower = async () => await Retrier.Attempt(async _ => await failer.InvokeFuncAsync(), delay: _ => TimeSpan.FromMilliseconds(1));
await thrower.Should().ThrowExactlyAsync<Failure>();
failer.InvocationCount.Should().Be(2);
}
[Fact]
public async Task AsyncFuncRetryNotAllowed() {
Failer failer = new(1);
Func<Task> thrower = async () => await Retrier.Attempt(async _ => await failer.InvokeFuncAsync(), isRetryAllowed: _ => false);
await thrower.Should().ThrowExactlyAsync<Failure>();
failer.InvocationCount.Should().Be(1);
}
[Fact]
public async Task MaxDelay() {
Failer failer = new(1);
CancellationTokenSource cts = new(200);
Func<Task> thrower = async () => await Retrier.Attempt(async _ => await failer.InvokeActionAsync(), delay: _ => TimeSpan.MaxValue, cancellationToken: cts.Token);
await thrower.Should().ThrowAsync<TaskCanceledException>();
failer.InvocationCount.Should().Be(1);
}
[Fact]
public void ActionCancellation() {
Failer failer = new();
CancellationTokenSource cts = new();
Action thrower = () => Retrier.Attempt(attempt => {
if (attempt >= 4) {
cts.Cancel();
}
failer.InvokeAction();
}, 10, cancellationToken: cts.Token);
thrower.Should().Throw<TaskCanceledException>();
failer.InvocationCount.Should().Be(5);
}
[Fact]
public void FuncCancellation() {
Failer failer = new();
CancellationTokenSource cts = new();
Func<int> thrower = () => Retrier.Attempt(attempt => {
if (attempt >= 4) {
cts.Cancel();
}
failer.InvokeAction();
return -1; // never returns because failer always throws
}, 10, cancellationToken: cts.Token);
thrower.Should().Throw<TaskCanceledException>();
failer.InvocationCount.Should().Be(5);
}
[Fact]
public async Task AsyncFuncTCancellation() {
Failer failer = new();
CancellationTokenSource cts = new();
Func<Task<int>> thrower = () => Retrier.Attempt(attempt => {
if (attempt >= 4) {
cts.Cancel();
}
failer.InvokeAction();
return Task.FromResult(-1); // never returns because failer always throws
}, 10, cancellationToken: cts.Token);
await thrower.Should().ThrowAsync<TaskCanceledException>();
failer.InvocationCount.Should().Be(5);
}
[Fact]
public async Task AsyncFuncCancellation() {
Failer failer = new();
CancellationTokenSource cts = new();
Func<Task> thrower = () => Retrier.Attempt(attempt => {
if (attempt >= 4) {
cts.Cancel();
}
failer.InvokeAction();
return Task.CompletedTask; // never returns because failer always throws
}, 10, cancellationToken: cts.Token);
await thrower.Should().ThrowAsync<TaskCanceledException>();
failer.InvocationCount.Should().Be(5);
}
private class Failure: Exception { }
private class Failer {
private static readonly Failure Exception = new();
private readonly int? _timesToFail;
public int InvocationCount { get; private set; }
public Failer(int? timesToFail = null) {
_timesToFail = timesToFail;
}
private void FailIfNecessary() {
InvocationCount++;
if (!_timesToFail.HasValue || InvocationCount <= _timesToFail) {
throw Exception;
}
}
public void InvokeAction() {
FailIfNecessary();
}
public bool InvokeFunc() {
FailIfNecessary();
return true;
}
public Task InvokeActionAsync() {
FailIfNecessary();
return Task.CompletedTask;
}
public Task<bool> InvokeFuncAsync() {
FailIfNecessary();
return Task.FromResult(true);
}
}
}