68 lines
2.3 KiB
C#
68 lines
2.3 KiB
C#
using ScadaLink.CentralUI.Components;
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namespace ScadaLink.CentralUI.Tests.Monitoring;
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/// <summary>
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/// Regression tests for CentralUI-008. <c><input type="datetime-local"></c>
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/// yields the value the user typed in their <i>browser-local</i> time zone. The
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/// audit-log filter converted it with <c>new DateTimeOffset(value, TimeSpan.Zero)</c>
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/// — relabelling the local wall-clock value as UTC, shifting the query window by
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/// the user's offset. <see cref="BrowserTime.LocalInputToUtc"/> performs the
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/// correct conversion: it applies the browser offset from <c>getTimezoneOffset()</c>.
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/// </summary>
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public class BrowserTimeTests
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{
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[Fact]
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public void LocalInputToUtc_Null_ReturnsNull()
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{
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Assert.Null(BrowserTime.LocalInputToUtc(null, 0));
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}
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[Fact]
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public void LocalInputToUtc_UtcBrowser_LeavesTimeUnchanged()
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{
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// getTimezoneOffset() == 0 for a UTC browser.
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var local = new DateTime(2026, 5, 16, 9, 30, 0);
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var utc = BrowserTime.LocalInputToUtc(local, 0);
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Assert.Equal(new DateTimeOffset(2026, 5, 16, 9, 30, 0, TimeSpan.Zero), utc);
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}
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[Fact]
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public void LocalInputToUtc_PositiveUtcOffsetBrowser_SubtractsOffset()
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{
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// A browser at UTC+2 reports getTimezoneOffset() == -120.
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// The user typing 09:30 local means 07:30 UTC.
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var local = new DateTime(2026, 5, 16, 9, 30, 0);
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var utc = BrowserTime.LocalInputToUtc(local, -120);
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Assert.Equal(new DateTimeOffset(2026, 5, 16, 7, 30, 0, TimeSpan.Zero), utc);
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}
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[Fact]
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public void LocalInputToUtc_NegativeUtcOffsetBrowser_AddsOffset()
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{
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// A browser at UTC-5 (US Eastern, standard time) reports getTimezoneOffset() == 300.
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// The user typing 09:30 local means 14:30 UTC.
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var local = new DateTime(2026, 5, 16, 9, 30, 0);
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var utc = BrowserTime.LocalInputToUtc(local, 300);
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Assert.Equal(new DateTimeOffset(2026, 5, 16, 14, 30, 0, TimeSpan.Zero), utc);
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}
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[Fact]
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public void LocalInputToUtc_NonUtcBrowser_DoesNotEqualNaiveRelabelling()
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{
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// The pre-fix bug: naive new DateTimeOffset(value, TimeSpan.Zero).
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var local = new DateTime(2026, 5, 16, 9, 30, 0);
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var naive = new DateTimeOffset(local, TimeSpan.Zero);
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var correct = BrowserTime.LocalInputToUtc(local, 300);
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Assert.NotEqual(naive, correct);
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}
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}
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