66 lines
2.0 KiB
C#
66 lines
2.0 KiB
C#
using Microsoft.Extensions.Logging.Abstractions;
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namespace ScadaLink.Host.Tests;
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/// <summary>
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/// Host-010: startup preconditions (database migration) must tolerate a database
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/// that is briefly unavailable at boot — common when an app container and its DB
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/// container start together — via a bounded retry with backoff.
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/// </summary>
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public class StartupRetryTests
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{
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[Fact]
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public async Task ExecuteWithRetry_SucceedsFirstTry_RunsOnce()
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{
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var attempts = 0;
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await StartupRetry.ExecuteWithRetryAsync(
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"test-op",
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() => { attempts++; return Task.CompletedTask; },
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maxAttempts: 5,
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initialDelay: TimeSpan.FromMilliseconds(1),
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NullLogger.Instance);
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Assert.Equal(1, attempts);
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}
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[Fact]
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public async Task ExecuteWithRetry_TransientFailures_RetriesUntilSuccess()
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{
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var attempts = 0;
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await StartupRetry.ExecuteWithRetryAsync(
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"test-op",
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() =>
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{
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attempts++;
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if (attempts < 3)
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throw new InvalidOperationException("db not ready");
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return Task.CompletedTask;
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},
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maxAttempts: 5,
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initialDelay: TimeSpan.FromMilliseconds(1),
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NullLogger.Instance);
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Assert.Equal(3, attempts);
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}
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[Fact]
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public async Task ExecuteWithRetry_ExhaustsAttempts_RethrowsLastException()
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{
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var attempts = 0;
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var ex = await Assert.ThrowsAsync<InvalidOperationException>(() =>
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StartupRetry.ExecuteWithRetryAsync(
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"test-op",
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() =>
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{
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attempts++;
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throw new InvalidOperationException($"failure {attempts}");
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},
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maxAttempts: 3,
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initialDelay: TimeSpan.FromMilliseconds(1),
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NullLogger.Instance));
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Assert.Equal(3, attempts);
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Assert.Equal("failure 3", ex.Message);
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}
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}
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