Joseph Doherty
dd05baedd6
Nothing read the mapping table beyond the startup validator; v3 UNS projection is
explicit via UnsTagReference. Legacy keys in stored DriverConfig are ignored (pinned).
Reverts the docker-dev opc-plc seed workaround from fdee129f.
Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
87 lines
3.7 KiB
C#
87 lines
3.7 KiB
C#
using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
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[Trait("Category", "Unit")]
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public sealed class OpcUaClientFailoverTests
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{
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/// <summary>Verifies that ResolveEndpointCandidates prefers EndpointUrls when provided.</summary>
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[Fact]
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public void ResolveEndpointCandidates_prefers_EndpointUrls_when_provided()
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{
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var opts = new OpcUaClientDriverOptions
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{
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EndpointUrl = "opc.tcp://fallback:4840",
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EndpointUrls = ["opc.tcp://primary:4840", "opc.tcp://backup:4841"],
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};
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var list = OpcUaClientDriver.ResolveEndpointCandidates(opts);
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list.Count.ShouldBe(2);
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list[0].ShouldBe("opc.tcp://primary:4840");
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list[1].ShouldBe("opc.tcp://backup:4841");
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}
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/// <summary>Verifies that ResolveEndpointCandidates falls back to single EndpointUrl when list is empty.</summary>
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[Fact]
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public void ResolveEndpointCandidates_falls_back_to_single_EndpointUrl_when_list_empty()
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{
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var opts = new OpcUaClientDriverOptions { EndpointUrl = "opc.tcp://only:4840" };
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var list = OpcUaClientDriver.ResolveEndpointCandidates(opts);
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list.Count.ShouldBe(1);
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list[0].ShouldBe("opc.tcp://only:4840");
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}
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/// <summary>Verifies that an empty EndpointUrls list is treated as a fallback to EndpointUrl.</summary>
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[Fact]
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public void ResolveEndpointCandidates_empty_list_treated_as_fallback_to_EndpointUrl()
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{
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// Explicit empty list should still fall back to the single-URL shortcut rather than
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// producing a zero-candidate sweep that would immediately throw with no URLs tried.
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var opts = new OpcUaClientDriverOptions
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{
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EndpointUrl = "opc.tcp://single:4840",
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EndpointUrls = [],
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};
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OpcUaClientDriver.ResolveEndpointCandidates(opts).Count.ShouldBe(1);
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}
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/// <summary>Verifies that HostName uses the first candidate before connection.</summary>
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[Fact]
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public void HostName_uses_first_candidate_before_connect()
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{
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var opts = new OpcUaClientDriverOptions
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{
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EndpointUrls = ["opc.tcp://primary:4840", "opc.tcp://backup:4841"],
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};
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using var drv = new OpcUaClientDriver(opts, "opcua-host");
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drv.HostName.ShouldBe("opc.tcp://primary:4840",
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"pre-connect the dashboard should show the first candidate URL so operators can link back");
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}
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/// <summary>Verifies that initializing against all unreachable endpoints throws AggregateException listing each.</summary>
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[Fact]
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public async Task Initialize_against_all_unreachable_endpoints_throws_AggregateException_listing_each()
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{
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// Port 1 + port 2 + port 3 on loopback are all guaranteed closed (TCP RST immediate).
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// Failover sweep should attempt all three and throw AggregateException naming each URL
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// so operators see exactly which candidates were tried.
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var opts = new OpcUaClientDriverOptions
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{
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EndpointUrls = ["opc.tcp://127.0.0.1:1", "opc.tcp://127.0.0.1:2", "opc.tcp://127.0.0.1:3"],
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PerEndpointConnectTimeout = TimeSpan.FromMilliseconds(500),
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Timeout = TimeSpan.FromMilliseconds(500),
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AutoAcceptCertificates = true,
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};
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using var drv = new OpcUaClientDriver(opts, "opcua-failover");
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var ex = await Should.ThrowAsync<AggregateException>(async () =>
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await drv.InitializeAsync("{}", TestContext.Current.CancellationToken));
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ex.Message.ShouldContain("127.0.0.1:1");
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ex.Message.ShouldContain("127.0.0.1:2");
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ex.Message.ShouldContain("127.0.0.1:3");
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drv.GetHealth().State.ShouldBe(DriverState.Faulted);
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}
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}
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