From 714baa8706a2943764521de87d43761d1cc191ed Mon Sep 17 00:00:00 2001
From: BuckyQ <buckyqian@topify.ai>
Date: Fri, 15 May 2026 16:31:44 -0700
Subject: [PATCH] feat: add SameNetTraceMergeSolver pipeline phase (#29)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds a new pipeline phase that merges trace segments belonging to the
same electrical net when their endpoints are within maxEndpointGap units
(default 0.12) of each other.

Implementation details:
- Traces are grouped by userNetId > globalConnNetId > dcConnNetId
- O(n²) scan per net group (groups are typically small in practice)
- Closest endpoint pair is selected; paths are reversed as needed
- A single L-shaped bridge is inserted when the join is not axis-aligned
- Duplicate consecutive points are removed from the merged path
- Iterates until no more mergeable pairs remain in any group

The solver is inserted into the pipeline after TraceCleanupSolver and
before NetLabelPlacementSolver so downstream label placement sees the
merged trace geometry.

All 65 tests pass. Updated snapshots for examples where same-net traces
were merged (examples 01, 02, 13, 14, 15, 18, 19).

Closes #29
---
 .../SameNetTraceMergeSolver.ts                | 156 ++++++++++++++
 .../SchematicTracePipelineSolver.ts           |  18 +-
 .../examples/__snapshots__/example01.snap.svg |  30 ++-
 .../examples/__snapshots__/example02.snap.svg |  76 ++++---
 .../examples/__snapshots__/example13.snap.svg |  84 ++++----
 .../examples/__snapshots__/example14.snap.svg |  62 +++---
 .../examples/__snapshots__/example15.snap.svg | 198 +++++++++++-------
 .../examples/__snapshots__/example18.snap.svg |  47 ++---
 .../examples/__snapshots__/example19.snap.svg |  96 +++++----
 .../SameNetTraceMergeSolver.test.ts           |  99 +++++++++
 10 files changed, 595 insertions(+), 271 deletions(-)
 create mode 100644 lib/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.ts
 create mode 100644 tests/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.test.ts

diff --git a/lib/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.ts b/lib/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.ts
new file mode 100644
index 00000000..f827aafe
--- /dev/null
+++ b/lib/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.ts
@@ -0,0 +1,156 @@
+import type { Point } from "@tscircuit/math-utils"
+import { BaseSolver } from "../BaseSolver/BaseSolver"
+import type { SolvedTracePath } from "../SchematicTraceLinesSolver/SchematicTraceLinesSolver"
+
+export interface SameNetTraceMergeSolverParams {
+  traces: SolvedTracePath[]
+  /**
+   * Maximum distance between two trace endpoints to consider them mergeable.
+   * Default: 0.12 units.
+   */
+  maxEndpointGap?: number
+}
+
+function dist(a: Point, b: Point): number {
+  return Math.hypot(a.x - b.x, a.y - b.y)
+}
+
+/** Net key for grouping – prefer user-defined net id, fall back to connectivity ids */
+function netKey(trace: SolvedTracePath): string {
+  return trace.userNetId ?? trace.globalConnNetId ?? trace.dcConnNetId
+}
+
+/** Remove exact duplicate consecutive points */
+function dedupe(pts: Point[]): Point[] {
+  const out: Point[] = []
+  for (const p of pts) {
+    const prev = out[out.length - 1]
+    if (!prev || Math.abs(prev.x - p.x) > 1e-9 || Math.abs(prev.y - p.y) > 1e-9) {
+      out.push(p)
+    }
+  }
+  return out
+}
+
+/**
+ * Try to merge two same-net traces by finding the closest endpoint pair.
+ * If the join requires a direction change, a single right-angle bridge is inserted.
+ * Returns the merged SolvedTracePath or null if the gap exceeds maxGap.
+ */
+function tryMerge(
+  a: SolvedTracePath,
+  b: SolvedTracePath,
+  maxGap: number,
+): SolvedTracePath | null {
+  const pa = a.tracePath
+  const pb = b.tracePath
+  if (pa.length === 0 || pb.length === 0) return null
+
+  const aS = pa[0]!
+  const aE = pa[pa.length - 1]!
+  const bS = pb[0]!
+  const bE = pb[pb.length - 1]!
+
+  const options = [
+    { d: dist(aE, bS), revA: false, revB: false },
+    { d: dist(aE, bE), revA: false, revB: true },
+    { d: dist(aS, bS), revA: true,  revB: false },
+    { d: dist(aS, bE), revA: true,  revB: true },
+  ]
+  const best = options.reduce((p, c) => (c.d < p.d ? c : p))
+  if (best.d > maxGap) return null
+
+  const ordA = best.revA ? [...pa].reverse() : [...pa]
+  const ordB = best.revB ? [...pb].reverse() : [...pb]
+
+  const from = ordA[ordA.length - 1]!
+  const to   = ordB[0]!
+
+  // Insert a single L-shaped bridge if the connection is not axis-aligned
+  const bridge: Point[] =
+    Math.abs(from.x - to.x) > 1e-9 && Math.abs(from.y - to.y) > 1e-9
+      ? [{ x: to.x, y: from.y }]
+      : []
+
+  return {
+    ...a,
+    mspPairId: `merged:${a.mspPairId}+${b.mspPairId}`,
+    tracePath: dedupe([...ordA, ...bridge, ...ordB]),
+    mspConnectionPairIds: [
+      ...a.mspConnectionPairIds,
+      ...b.mspConnectionPairIds,
+    ],
+    pinIds: [...a.pinIds, ...b.pinIds],
+  }
+}
+
+/**
+ * SameNetTraceMergeSolver — pipeline phase that joins trace segments belonging
+ * to the same electrical net when their endpoints are within `maxEndpointGap`
+ * units of each other.
+ *
+ * Runs iteratively until no more merges are possible (or the solver is marked
+ * solved/failed by the base class iteration guard).
+ */
+export class SameNetTraceMergeSolver extends BaseSolver {
+  readonly inputTraces: SolvedTracePath[]
+  outputTraces: SolvedTracePath[]
+  readonly maxEndpointGap: number
+  /** Total number of merges performed across all _step() calls */
+  mergeCount = 0
+
+  constructor({
+    traces,
+    maxEndpointGap = 0.12,
+  }: SameNetTraceMergeSolverParams) {
+    super()
+    this.inputTraces = [...traces]
+    this.outputTraces = [...traces]
+    this.maxEndpointGap = maxEndpointGap
+  }
+
+  getOutput(): { traces: SolvedTracePath[] } {
+    return { traces: this.outputTraces }
+  }
+
+  override _step(): void {
+    // Group current traces by net
+    const byNet = new Map<string, SolvedTracePath[]>()
+    for (const trace of this.outputTraces) {
+      const k = netKey(trace)
+      const group = byNet.get(k)
+      if (group) group.push(trace)
+      else byNet.set(k, [trace])
+    }
+
+    let merged = false
+
+    for (const group of byNet.values()) {
+      if (group.length < 2) continue
+
+      // O(n²) scan – groups are typically small
+      outer: for (let i = 0; i < group.length; i++) {
+        for (let j = i + 1; j < group.length; j++) {
+          const joined = tryMerge(group[i]!, group[j]!, this.maxEndpointGap)
+          if (joined) {
+            // Replace the two original traces with the merged one
+            this.outputTraces = this.outputTraces.filter(
+              (t) =>
+                t.mspPairId !== group[i]!.mspPairId &&
+                t.mspPairId !== group[j]!.mspPairId,
+            )
+            this.outputTraces.push(joined)
+            this.mergeCount++
+            merged = true
+            break outer // Restart the scan for this net
+          }
+        }
+      }
+    }
+
+    if (!merged) {
+      // No more mergeable pairs – we're done
+      this.solved = true
+    }
+  }
+}
diff --git a/lib/solvers/SchematicTracePipelineSolver/SchematicTracePipelineSolver.ts b/lib/solvers/SchematicTracePipelineSolver/SchematicTracePipelineSolver.ts
index 59821f0c..ff769e52 100644
--- a/lib/solvers/SchematicTracePipelineSolver/SchematicTracePipelineSolver.ts
+++ b/lib/solvers/SchematicTracePipelineSolver/SchematicTracePipelineSolver.ts
@@ -21,6 +21,7 @@ import { expandChipsToFitPins } from "./expandChipsToFitPins"
 import { LongDistancePairSolver } from "../LongDistancePairSolver/LongDistancePairSolver"
 import { MergedNetLabelObstacleSolver } from "../TraceLabelOverlapAvoidanceSolver/sub-solvers/LabelMergingSolver/LabelMergingSolver"
 import { TraceCleanupSolver } from "../TraceCleanupSolver/TraceCleanupSolver"
+import { SameNetTraceMergeSolver } from "../SameNetTraceMergeSolver/SameNetTraceMergeSolver"
 import { Example28Solver } from "../Example28Solver/Example28Solver"
 import { AvailableNetOrientationSolver } from "../AvailableNetOrientationSolver/AvailableNetOrientationSolver"
 import { VccNetLabelCornerPlacementSolver } from "../VccNetLabelCornerPlacementSolver/VccNetLabelCornerPlacementSolver"
@@ -75,6 +76,7 @@ export class SchematicTracePipelineSolver extends BaseSolver {
   labelMergingSolver?: MergedNetLabelObstacleSolver
   traceLabelOverlapAvoidanceSolver?: TraceLabelOverlapAvoidanceSolver
   traceCleanupSolver?: TraceCleanupSolver
+  sameNetTraceMergeSolver?: SameNetTraceMergeSolver
   example28Solver?: Example28Solver
   availableNetOrientationSolver?: AvailableNetOrientationSolver
   vccNetLabelCornerPlacementSolver?: VccNetLabelCornerPlacementSolver
@@ -217,11 +219,24 @@ export class SchematicTracePipelineSolver extends BaseSolver {
         },
       ]
     }),
+    definePipelineStep(
+      "sameNetTraceMergeSolver",
+      SameNetTraceMergeSolver,
+      (instance) => {
+        const traces =
+          instance.sameNetTraceMergeSolver?.getOutput().traces ??
+          instance.traceCleanupSolver?.getOutput().traces ??
+          instance.traceLabelOverlapAvoidanceSolver!.getOutput().traces
+        return [{ traces }]
+      },
+    ),
     definePipelineStep(
       "netLabelPlacementSolver",
       NetLabelPlacementSolver,
       (instance) => {
         const traces =
+          instance.sameNetTraceMergeSolver?.getOutput().traces ??
+          instance.sameNetTraceMergeSolver?.getOutput().traces ??
           instance.traceCleanupSolver?.getOutput().traces ??
           instance.traceLabelOverlapAvoidanceSolver!.getOutput().traces
 
@@ -237,7 +252,8 @@ export class SchematicTracePipelineSolver extends BaseSolver {
     ),
     definePipelineStep("example28Solver", Example28Solver, (instance) => {
       const traces =
-        instance.traceCleanupSolver?.getOutput().traces ??
+        instance.sameNetTraceMergeSolver?.getOutput().traces ??
+          instance.traceCleanupSolver?.getOutput().traces ??
         instance.traceLabelOverlapAvoidanceSolver!.getOutput().traces
 
       return [
diff --git a/tests/examples/__snapshots__/example01.snap.svg b/tests/examples/__snapshots__/example01.snap.svg
index 2614ba80..e185ca90 100644
--- a/tests/examples/__snapshots__/example01.snap.svg
+++ b/tests/examples/__snapshots__/example01.snap.svg
@@ -41,16 +41,16 @@ y+" data-x="-4" data-y="0.5" cx="67.72277227722776" cy="245.14851485148515" r="3
 y-" data-x="-4" data-y="-0.5" cx="67.72277227722776" cy="356.03960396039605" r="3" fill="hsl(3, 100%, 50%, 0.8)" />
   </g>
   <g>
-    <circle data-type="point" data-label="anchorPoint
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+    <circle data-type="point" data-label="" data-x="-1.1" data-y="0.20000000000000018" cx="389.3069306930693" cy="278.4158415841584" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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-orientation: x-" data-x="-1.275" data-y="0" cx="369.90099009900996" cy="300.5940594059406" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
+    <circle data-type="point" data-label="" data-x="-1.275" data-y="0" cx="369.90099009900996" cy="300.5940594059406" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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   <g>
-    <circle data-type="point" data-label="anchorPoint
-orientation: y-" data-x="-1.4" data-y="-0.7" cx="356.0396039603961" cy="378.2178217821782" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
+    <circle data-type="point" data-label="" data-x="-1.4" data-y="-0.7" cx="356.0396039603961" cy="378.2178217821782" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
+  </g>
+  <g>
+    <circle data-type="point" data-label="" data-x="-4" data-y="-0.5" cx="67.72277227722776" cy="356.03960396039605" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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@@ -74,10 +74,7 @@ orientation: y-" data-x="-1.4" data-y="-0.7" cx="356.0396039603961" cy="378.2178
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   </g>
   <g>
-    <polyline data-points="-0.8,-0.20000000000000018 -1.4,-0.20000000000000018 -1.4,-0.7 -2,-0.7 -2,-0.5" data-type="line" data-label="" points="422.5742574257426,322.7722772277228 356.0396039603961,322.7722772277228 356.0396039603961,378.2178217821782 289.50495049504957,378.2178217821782 289.50495049504957,356.03960396039605" fill="none" stroke="purple" stroke-width="1" />
-  </g>
-  <g>
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+    <polyline data-points="-0.8,-0.20000000000000018 -1.4,-0.20000000000000018 -1.4,-0.7 -2,-0.7 -2,-0.5 -2,-0.7000000000000002 -4,-0.7000000000000002 -4,-0.5" data-type="line" data-label="" points="422.5742574257426,322.7722772277228 356.0396039603961,322.7722772277228 356.0396039603961,378.2178217821782 289.50495049504957,378.2178217821782 289.50495049504957,356.03960396039605 289.50495049504957,378.21782178217825 67.72277227722776,378.21782178217825 67.72277227722776,356.03960396039605" fill="none" stroke="purple" stroke-width="1" />
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@@ -90,18 +87,19 @@ orientation: y-" data-x="-1.4" data-y="-0.7" cx="356.0396039603961" cy="378.2178
   </g>
   <g>
     <rect data-type="rect" data-label="netId: VCC
-globalConnNetId: connectivity_net0
-available orientations: y+" data-x="-1.1" data-y="0.42500000000000016" x="378.21782178217825" y="228.51485148514848" width="22.178217821782198" height="49.9009900990099" fill="#ef444466" stroke="#ef4444" stroke-width="0.009017857142857143" />
+globalConnNetId: connectivity_net0" data-x="-1.1" data-y="0.42500000000000016" x="378.21782178217825" y="228.51485148514848" width="22.178217821782198" height="49.9009900990099" fill="#ef444466" stroke="#ef4444" stroke-width="0.009017857142857143" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: EN
-globalConnNetId: connectivity_net1
-available orientations: x+, x-" data-x="-1.5" data-y="0" x="320" y="289.5049504950495" width="49.90099009900996" height="22.17821782178214" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.009017857142857143" />
+globalConnNetId: connectivity_net1" data-x="-1.5" data-y="0" x="320" y="289.5049504950495" width="49.90099009900996" height="22.17821782178214" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.009017857142857143" />
+  </g>
+  <g>
+    <rect data-type="rect" data-label="netId: GND
+globalConnNetId: connectivity_net2" data-x="-1.4" data-y="-0.9249999999999999" x="344.950495049505" y="378.2178217821782" width="22.178217821782198" height="49.9009900990099" fill="#00000066" stroke="#000000" stroke-width="0.009017857142857143" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: GND
-globalConnNetId: connectivity_net2
-available orientations: y-" data-x="-1.4" data-y="-0.9249999999999999" x="344.950495049505" y="378.2178217821782" width="22.178217821782198" height="49.9009900990099" fill="#00000066" stroke="#000000" stroke-width="0.009017857142857143" />
+globalConnNetId: connectivity_net2" data-x="-4" data-y="-0.726" x="56.63366336633669" y="356.1504950495049" width="22.17821782178214" height="49.90099009900996" fill="#00000066" stroke="#000000" stroke-width="0.009017857142857143" />
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     <line id="crosshair-h" y1="0" y2="640" stroke="#666" stroke-width="0.5" />
diff --git a/tests/examples/__snapshots__/example02.snap.svg b/tests/examples/__snapshots__/example02.snap.svg
index 3815fdc0..cc0af8cd 100644
--- a/tests/examples/__snapshots__/example02.snap.svg
+++ b/tests/examples/__snapshots__/example02.snap.svg
@@ -53,20 +53,31 @@ x+" data-x="1" data-y="-0.1" cx="500.20151295522464" cy="341.11637364700744" r="
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   <g>
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+    <circle data-type="point" data-label="" data-x="-1.101" data-y="0.401" cx="322.38387354695703" cy="298.71435682475993" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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+  <g>
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+  <g>
+    <circle data-type="point" data-label="" data-x="1.4571549750000001" data-y="0.29999999999999966" cx="538.8927164289255" cy="307.26246800050245" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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@@ -156,63 +167,70 @@ orientation: y+" data-x="1.4571549750000001" data-y="0.29999999999999966" cx="53
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-    <polyline data-points="2.0034928,-0.8350319000000007 2.0034928,-0.1 0.7000000000000001,-0.1 0.7000000000000001,-0.2 0.6000000000000001,-0.2" data-type="line" data-label="" points="300.34928,422.74112250000013 300.34928,349.23793250000006 170.00000000000003,349.23793250000006 170.00000000000003,359.23793250000006 160.00000000000003,359.23793250000006" fill="none" stroke="purple" stroke-width="1" />
+    <polyline data-points="3.8000000000000003,-0.9 3.6000000000000005,-0.9 3.6000000000000005,0 3.8000000000000003,0 3.5256453500000005,0 3.5256453500000005,1.2997267500000007 3.2512907000000006,1.2997267500000007" data-type="line" data-label="" points="480,429.26525749999996 460.0000000000001,429.26525749999996 460.0000000000001,339.26525749999996 480,339.26525749999996 452.5645350000001,339.26525749999996 452.5645350000001,209.2925824999999 425.12907000000007,209.2925824999999" fill="none" stroke="purple" stroke-width="1" />
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   <g>
-    <rect data-type="rect" data-label="schematic_component_0" data-x="0" data-y="0" x="40.00000000000002" y="299.23793250000006" width="120" height="80" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_0" data-x="0" data-y="0" x="40.00000000000002" y="299.26525749999996" width="120" height="80" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
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   <g>
-    <rect data-type="rect" data-label="schematic_component_1" data-x="1.4" data-y="0.55" x="213.54167" y="229.1170025" width="52.916660000000036" height="110.24186000000009" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_1" data-x="1.4" data-y="0.55" x="213.54167" y="229.14432749999992" width="52.916660000000036" height="110.24186000000009" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_2" data-x="2.7" data-y="1.3" x="314.87093" y="189.7923975000001" width="110.25814000000008" height="38.8910699999999" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_2" data-x="2.7" data-y="1.3" x="314.87093" y="189.8197225" width="110.25814000000008" height="38.8910699999999" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_3" data-x="4.4" data-y="0" x="480" y="319.23793250000006" width="120" height="40" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_3" data-x="4.4" data-y="0" x="480" y="319.26525749999996" width="120" height="40" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_4" data-x="4.4" data-y="-0.9" x="480" y="409.23793250000006" width="120" height="40" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_4" data-x="4.4" data-y="-0.9" x="480" y="409.26525749999996" width="120" height="40" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_5" data-x="2" data-y="-1.1" x="255.41992000000002" y="422.74112250000013" width="89.16015999999999" height="52.99361999999991" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
+    <rect data-type="rect" data-label="schematic_component_5" data-x="2" data-y="-1.1" x="255.41992000000002" y="422.76844750000004" width="89.16015999999999" height="52.99361999999991" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: solderjumper.JP8 &gt; port.pin2 to .U1 &gt; .pin6
-globalConnNetId: connectivity_net3" data-x="2.2284928" data-y="-0.46751595000000035" x="300.34928" y="375.9895275000001" width="45" height="19.999999999999943" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+globalConnNetId: connectivity_net3" data-x="2.2284928" data-y="-0.46751595000000035" x="300.34928" y="376.0168525" width="45" height="19.999999999999943" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: capacitor.C2 &gt; port.pin1 to .U1 &gt; .pin8
-globalConnNetId: connectivity_net0" data-x="1.6252733499999996" data-y="-0.30120930000000024" x="240.027335" y="359.3588625000001" width="45" height="20" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+globalConnNetId: connectivity_net0" data-x="1.6252733499999996" data-y="-0.30120930000000024" x="240.027335" y="359.3861875" width="45" height="20" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: resistor.R1 &gt; port.pin1 to .U1 &gt; .pin1
-globalConnNetId: connectivity_net1" data-x="0.7999316625000001" data-y="0.42500000000000004" x="169.99316625000006" y="274.23793250000006" width="20" height="45" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+globalConnNetId: connectivity_net1" data-x="1.774217975" data-y="1.5252732499999995" x="267.4217975" y="164.2379325" width="20" height="45.00000000000003" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+  </g>
+  <g>
+    <rect data-type="rect" data-label="netId: resistor.R1 &gt; port.pin1 to .U1 &gt; .pin1
+globalConnNetId: connectivity_net1" data-x="0.8260000000000001" data-y="0.2" x="160.10000000000002" y="309.26525749999996" width="45.00000000000003" height="20" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+  </g>
+  <g>
+    <rect data-type="rect" data-label="netId: PAD
+globalConnNetId: connectivity_net2" data-x="3.6000000000000005" data-y="-1.125" x="450.0000000000001" y="429.26525749999996" width="20" height="45" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: PAD
-globalConnNetId: connectivity_net2" data-x="3.3884680250000008" data-y="1.5247267500000008" x="428.8468025000001" y="164.26525749999996" width="20" height="45.00000000000003" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
+globalConnNetId: connectivity_net2" data-x="3.4772907000000006" data-y="1.2997267500000007" x="425.2290700000001" y="199.2925824999999" width="45" height="20" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01" />
   </g>
   <g id="crosshair" style="display: none">
     <line id="crosshair-h" y1="0" y2="640" stroke="#666" stroke-width="0.5" />
@@ -176,7 +180,7 @@ globalConnNetId: connectivity_net2" data-x="3.3884680250000008" data-y="1.524726
         "e": 100.00000000000003,
         "b": 0,
         "d": -100,
-        "f": 339.23793250000006
+        "f": 339.26525749999996
       };
       // Manually invert and apply the affine transform
       // Since we only use translate and scale, we can directly compute:
diff --git a/tests/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.test.ts b/tests/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.test.ts
new file mode 100644
index 00000000..28287138
--- /dev/null
+++ b/tests/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver.test.ts
@@ -0,0 +1,99 @@
+import { expect, test, describe } from "bun:test"
+import { SameNetTraceMergeSolver } from "lib/solvers/SameNetTraceMergeSolver/SameNetTraceMergeSolver"
+import type { SolvedTracePath } from "lib/solvers/SchematicTraceLinesSolver/SchematicTraceLinesSolver"
+
+function makeTrace(
+  id: string,
+  netId: string,
+  path: Array<{ x: number; y: number }>,
+): SolvedTracePath {
+  return {
+    mspPairId: id,
+    dcConnNetId: netId,
+    globalConnNetId: netId,
+    userNetId: undefined,
+    pins: [] as any,
+    tracePath: path,
+    mspConnectionPairIds: [id],
+    pinIds: [],
+  }
+}
+
+describe("SameNetTraceMergeSolver", () => {
+  test("merges two collinear same-net traces with touching endpoints", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 1, y: 0 }, { x: 2, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2] })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.solved).toBe(true)
+    expect(solver.outputTraces.length).toBe(1)
+    expect(solver.mergeCount).toBe(1)
+    expect(solver.outputTraces[0]!.tracePath).toEqual([
+      { x: 0, y: 0 },
+      { x: 1, y: 0 },
+      { x: 2, y: 0 },
+    ])
+  })
+
+  test("merges traces with a small gap within maxEndpointGap", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 1.1, y: 0 }, { x: 2, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2], maxEndpointGap: 0.15 })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(1)
+  })
+
+  test("does NOT merge traces from different nets", () => {
+    const t1 = makeTrace("t1", "netA", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "netB", [{ x: 1, y: 0 }, { x: 2, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2] })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(2)
+    expect(solver.mergeCount).toBe(0)
+  })
+
+  test("does NOT merge when gap exceeds maxEndpointGap", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 2, y: 0 }, { x: 3, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2], maxEndpointGap: 0.12 })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(2)
+  })
+
+  test("inserts L-bridge when endpoints are not axis-aligned", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 1.05, y: 0.05 }, { x: 2, y: 0.05 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2], maxEndpointGap: 0.15 })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(1)
+    // Bridge point should exist between the two paths
+    const path = solver.outputTraces[0]!.tracePath
+    expect(path.length).toBeGreaterThan(3)
+  })
+
+  test("merges multiple traces in the same net iteratively", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 1, y: 0 }, { x: 2, y: 0 }])
+    const t3 = makeTrace("t3", "net1", [{ x: 2, y: 0 }, { x: 3, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2, t3] })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(1)
+    expect(solver.mergeCount).toBe(2)
+  })
+
+  test("leaves single-trace nets unchanged", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1] })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(1)
+    expect(solver.mergeCount).toBe(0)
+  })
+
+  test("handles reversed endpoint matching (end-to-end)", () => {
+    const t1 = makeTrace("t1", "net1", [{ x: 0, y: 0 }, { x: 1, y: 0 }])
+    const t2 = makeTrace("t2", "net1", [{ x: 2, y: 0 }, { x: 1, y: 0 }])
+    const solver = new SameNetTraceMergeSolver({ traces: [t1, t2] })
+    while (!solver.solved && !solver.failed) solver.step()
+    expect(solver.outputTraces.length).toBe(1)
+  })
+})