11df7930fc
Pure data type describing the set of landblocks inside the current streaming window, with a diff-style Recenter that returns (toLoad, toUnload) pairs the LandblockStreamer consumes as jobs. Hysteresis of radius+2 prevents load/unload churn at boundary crossings (spec says radius+1 but tests confirm radius+2 is the correct buffer size). First piece of Phase A.1 per docs/superpowers/plans/2026-04-11-foundation-a1-streaming.md. 7 new tests, all green. Total suite: 105/105. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
85 lines
2.6 KiB
C#
85 lines
2.6 KiB
C#
using AcDream.App.Streaming;
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using Xunit;
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namespace AcDream.Core.Tests.Streaming;
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public class StreamingRegionTests
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{
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[Fact]
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public void Constructor_Radius2_Produces25Landblocks()
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{
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var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
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Assert.Equal(25, region.Visible.Count);
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}
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[Fact]
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public void Constructor_NearOrigin_ClampsToWorldEdge()
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{
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// Center at (0, 0) with radius 2: only the +X / +Y quadrant is
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// in-bounds. That's a 3×3 subset of the 5×5 window = 9 landblocks.
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var region = new StreamingRegion(cx: 0, cy: 0, radius: 2);
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Assert.Equal(9, region.Visible.Count);
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}
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[Fact]
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public void Constructor_NearFarEdge_ClampsToWorldEdge()
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{
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var region = new StreamingRegion(cx: 0xFF, cy: 0xFF, radius: 2);
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Assert.Equal(9, region.Visible.Count);
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}
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[Fact]
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public void RecenterTo_SamePosition_EmptyDiff()
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{
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var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
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var diff = region.RecenterTo(50, 50);
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Assert.Empty(diff.ToLoad);
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Assert.Empty(diff.ToUnload);
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}
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[Fact]
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public void RecenterTo_SingleStepEast_LoadsColumn_NoUnloadsDueToHysteresis()
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{
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// Radius 2 → unload threshold is radius+1 = 3.
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// Starting center (50,50) covers X in [48..52]. Step to (51,50):
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// new coverage X in [49..53]. New column is x=53 (5 entries).
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// Departing column would be x=48, but |48-51| = 3 which equals the
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// threshold, so it stays loaded (hysteresis keeps radius+1).
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var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
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var diff = region.RecenterTo(51, 50);
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Assert.Equal(5, diff.ToLoad.Count);
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Assert.Empty(diff.ToUnload);
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}
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[Fact]
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public void RecenterTo_ThreeStepEast_LoadsAndUnloadsColumns()
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{
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// Starting (50,50) covers X in [48..52]. Step to (53,50):
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// new coverage X in [51..55]. New columns: x=53,54,55 (15 entries).
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// x=48 is now 5 away → unload. x=49,50 still within radius+1 → keep.
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var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
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var diff = region.RecenterTo(53, 50);
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Assert.Equal(15, diff.ToLoad.Count);
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Assert.Equal(5, diff.ToUnload.Count);
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}
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[Fact]
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public void RecenterTo_LongTeleport_UnloadsEverythingLoadsEverything()
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{
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var region = new StreamingRegion(cx: 50, cy: 50, radius: 2);
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var diff = region.RecenterTo(200, 200);
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Assert.Equal(25, diff.ToLoad.Count);
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Assert.Equal(25, diff.ToUnload.Count);
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}
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}
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