From d9e0a716064c8d26aae402acded9e81a244da0ab Mon Sep 17 00:00:00 2001
From: Wilson Xu <chengyi_xu@outlook.com>
Date: Mon, 4 May 2026 22:04:00 +0800
Subject: [PATCH 1/2] fix(MspConnectionPairSolver): prevent net-label-only pins
 from producing spurious wire traces

Fixes #79

The root cause was a shared-reference bug in getConnectivityMapsFromInputProblem:
  new ConnectivityMap(directConnMap.netMap) passed netMap by reference, so
  subsequent addConnections calls on netConnMap (for netConnections like VCC/GND
  labels) mutated directConnMap.netMap arrays as well. This caused net-label-only
  pins (e.g. a capacitor pin with only a VCC label, no wire connection) to be
  merged into direct-wire nets, producing spurious MSP pairs and wire traces.

Fix: deep-clone each array in directConnMap.netMap before constructing netConnMap,
so mutations remain isolated. Additionally, _step() now uses dcConnMap (not
globalConnMap) to look up pins for direct-wire nets, ensuring net-label-only pins
that were merged into the global net are excluded from wire routing. Net-label-only
nets (added exclusively via netConnections) continue to use globalConnMap so they
still generate correct MSP pairs when multiple pins share the same net label.

Updated snapshots for examples 07, 13, 15, 18, 21, 27 to reflect the corrected
routing (fewer spurious cross-component wire connections via shared net labels).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../MspConnectionPairSolver.ts                |  20 ++-
 .../getConnectivityMapFromInputProblem.ts     |   7 +-
 .../examples/__snapshots__/example07.snap.svg |  12 +-
 .../examples/__snapshots__/example13.snap.svg |  21 ++-
 .../examples/__snapshots__/example15.snap.svg | 112 ++++++++-----
 .../examples/__snapshots__/example18.snap.svg | 120 +++++++-------
 .../examples/__snapshots__/example21.snap.svg | 147 +++++++++---------
 .../examples/__snapshots__/example27.snap.svg |   5 +-
 .../MspConnectionPairSolver_repro79.test.ts   |  71 +++++++++
 9 files changed, 329 insertions(+), 186 deletions(-)
 create mode 100644 tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts

diff --git a/lib/solvers/MspConnectionPairSolver/MspConnectionPairSolver.ts b/lib/solvers/MspConnectionPairSolver/MspConnectionPairSolver.ts
index 48b46c90..bda85335 100644
--- a/lib/solvers/MspConnectionPairSolver/MspConnectionPairSolver.ts
+++ b/lib/solvers/MspConnectionPairSolver/MspConnectionPairSolver.ts
@@ -74,7 +74,16 @@ export class MspConnectionPairSolver extends BaseSolver {
       }
     }
 
-    this.queuedDcNetIds = Object.keys(netConnMap.netMap)
+    // Queue all direct-wire nets from dcConnMap plus any nets that exist only in
+    // globalConnMap (net-label-only nets such as GND shared via netConnections).
+    // Because directConnMap and netConnMap now have independent netMap arrays (deep
+    // clone in getConnectivityMapsFromInputProblem), net-label pins that happen to
+    // share a name with a direct-wire pin are NOT merged into the direct-wire net.
+    const directNetIds = new Set(Object.keys(directConnMap.netMap))
+    const netLabelOnlyNetIds = Object.keys(netConnMap.netMap).filter(
+      (id) => !directNetIds.has(id),
+    )
+    this.queuedDcNetIds = [...directNetIds, ...netLabelOnlyNetIds]
   }
 
   override getConstructorParams(): ConstructorParameters<
@@ -93,7 +102,14 @@ export class MspConnectionPairSolver extends BaseSolver {
 
     const dcNetId = this.queuedDcNetIds.shift()!
 
-    const allIds = this.globalConnMap.getIdsConnectedToNet(dcNetId) as string[]
+    // For direct-wire nets use dcConnMap so that net-label-only pins merged into
+    // the same global net are not included in wire routing.  For net-label-only
+    // nets (not present in dcConnMap) fall back to globalConnMap.
+    const dcIds = this.dcConnMap.getIdsConnectedToNet(dcNetId) as string[]
+    const allIds =
+      dcIds.length > 0
+        ? dcIds
+        : (this.globalConnMap.getIdsConnectedToNet(dcNetId) as string[])
     const directlyConnectedPins = allIds.filter((id) => !!this.pinMap[id])
 
     if (directlyConnectedPins.length <= 1) {
diff --git a/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts b/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
index d3a098c3..0fe8fde1 100644
--- a/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
+++ b/lib/solvers/MspConnectionPairSolver/getConnectivityMapFromInputProblem.ts
@@ -14,7 +14,12 @@ export const getConnectivityMapsFromInputProblem = (
     ])
   }
 
-  const netConnMap = new ConnectivityMap(directConnMap.netMap)
+  // Deep-clone each array so that mutations in netConnMap (e.g. merging net-label
+  // pins into an existing direct-wire net) do NOT corrupt directConnMap.
+  const clonedNetMap = Object.fromEntries(
+    Object.entries(directConnMap.netMap).map(([k, v]) => [k, [...v]]),
+  )
+  const netConnMap = new ConnectivityMap(clonedNetMap)
 
   for (const netConn of inputProblem.netConnections) {
     netConnMap.addConnections([[netConn.netId, ...netConn.pinIds]])
diff --git a/tests/examples/__snapshots__/example07.snap.svg b/tests/examples/__snapshots__/example07.snap.svg
index 7098ddac..91ca6743 100644
--- a/tests/examples/__snapshots__/example07.snap.svg
+++ b/tests/examples/__snapshots__/example07.snap.svg
@@ -50,7 +50,7 @@ y-" data-x="1.757519574999999" data-y="1.2" cx="547.3539750075635" cy="270.41751
   </g>
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@@ -114,10 +114,7 @@ orientation: x+" data-x="1.757519574999999" data-y="0.85" cx="547.3539750075635"
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+  <g>
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+  </g>
   <g>
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@@ -137,7 +137,7 @@ orientation: x+" data-x="1.757519574999999" data-y="0.85" cx="547.3539750075635"
   <g>
     <rect data-type="rect" data-label="netId: V3_3
 globalConnNetId: connectivity_net0
-available orientations: y+" data-x="-1.8574283249999997" data-y="0.9762093000000004" x="112.7378861431207" y="270.2760341291854" width="23.398233329971788" height="52.64602499243642" fill="#ef444466" stroke="#ef4444" stroke-width="0.00854765388392857" />
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   </g>
   <g>
     <rect data-type="rect" data-label="netId: V3_3
diff --git a/tests/examples/__snapshots__/example13.snap.svg b/tests/examples/__snapshots__/example13.snap.svg
index 3fe23640..6db16e22 100644
--- a/tests/examples/__snapshots__/example13.snap.svg
+++ b/tests/examples/__snapshots__/example13.snap.svg
@@ -98,7 +98,11 @@ orientation: y+" data-x="-2.125" data-y="0" cx="152.1300058038305" cy="352.50145
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+orientation: y+" data-x="-3.75" data-y="1.125" cx="46.500290191526375" cy="279.37318630296" r="3" fill="hsl(40, 100%, 50%, 0.9)" />
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@@ -277,7 +281,12 @@ available orientations: any" data-x="-2.125" data-y="0.225" x="145.6297156123041
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+  <g>
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diff --git a/tests/examples/__snapshots__/example15.snap.svg b/tests/examples/__snapshots__/example15.snap.svg
index 5d1b2f9d..0f375cea 100644
--- a/tests/examples/__snapshots__/example15.snap.svg
+++ b/tests/examples/__snapshots__/example15.snap.svg
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       // Calculate real coordinates using inverse transformation
       const matrix = {
-        "a": 89.52604718777262,
+        "a": 92.46779165183602,
         "c": 0,
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+        "e": 337.18268983786237,
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-        "f": 304.3329417421398
+        "d": -92.46779165183602,
+        "f": 294.617591191571
       };
       // Manually invert and apply the affine transform
       // Since we only use translate and scale, we can directly compute:
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+    <rect data-type="rect" data-label="schematic_component_1" data-x="4.785" data-y="-0.3999999999999999" x="394.4835545297173" y="245.67801500288513" width="129.25562608193883" height="116.33006347374496" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.015473214285714283" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_1" data-x="4.785" data-y="-0.3999999999999999" x="396.8514715947981" y="243.37211955281768" width="127.76637006616465" height="114.98973305954829" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01565357142857143" />
+    <rect data-type="rect" data-label="schematic_component_2" data-x="6.7" data-y="-0.9499999999999993" x="565.7472590882863" y="303.8430467397576" width="34.25274091171377" height="71.09059434506634" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.015473214285714283" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_2" data-x="6.7" data-y="-0.9499999999999993" x="566.1419119324663" y="300.8669860825918" width="33.858088067533686" height="70.27150353639058" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01565357142857143" />
+    <rect data-type="rect" data-label="schematic_component_3" data-x="2.8699999999999997" data-y="-1.75" x="318.22273514137333" y="355.5452971725332" width="34.25274091171383" height="71.09059434506634" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.015473214285714283" />
   </g>
   <g>
-    <rect data-type="rect" data-label="schematic_component_3" data-x="2.8699999999999997" data-y="-1.75" x="321.4693132557609" y="351.9735341090577" width="33.85808806753363" height="70.27150353639058" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01565357142857143" />
-  </g>
-  <g>
-    <rect data-type="rect" data-label="schematic_component_4" data-x="2.9752723250000006" data-y="0.050000000000000266" x="334.91957608943653" y="236.98380104950942" width="20.407825233858034" height="70.27150353639061" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.01565357142857143" />
+    <rect data-type="rect" data-label="schematic_component_4" data-x="2.9752723250000006" data-y="0.050000000000000266" x="331.82977541834975" y="239.21523369878818" width="20.64570063473741" height="71.09059434506636" fill="hsl(24, 100%, 50%, 0.8)" stroke="black" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: GND
 globalConnNetId: connectivity_net3
-available orientations: y-" data-x="-1.551" data-y="-0.801" x="49.58247775496234" y="316.9016655258955" width="12.776637006616482" height="19.16495550992471" fill="#00000066" stroke="#000000" stroke-width="0.01565357142857143" />
+available orientations: y-" data-x="-1.5999999999999999" data-y="-1.3499999999999999" x="39.999999999999986" y="355.5452971725332" width="12.9255626081939" height="19.388343912290793" fill="#00000066" stroke="#000000" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: GND
 globalConnNetId: connectivity_net3
-available orientations: y-" data-x="1.551" data-y="-0.801" x="247.7481177275838" y="316.9016655258955" width="12.776637006616511" height="19.16495550992471" fill="#00000066" stroke="#000000" stroke-width="0.01565357142857143" />
+available orientations: y-" data-x="2.8699999999999997" data-y="-2.65" x="328.88632429313327" y="439.56145412579343" width="12.9255626081939" height="19.38834391229085" fill="#00000066" stroke="#000000" stroke-width="0.015473214285714283" />
   </g>
   <g>
-    <rect data-type="rect" data-label="netId: GND
-globalConnNetId: connectivity_net3
-available orientations: y-" data-x="2.8699999999999997" data-y="-2.65" x="332.0100387862194" y="435.0216746520648" width="12.776637006616511" height="19.164955509924653" fill="#00000066" stroke="#000000" stroke-width="0.01565357142857143" />
+    <rect data-type="rect" data-label="netId: VIN
+globalConnNetId: connectivity_net1
+available orientations: y+" data-x="2.8699999999999997" data-y="-1.0490000000000002" x="328.88632429313327" y="336.09232544720135" width="12.9255626081939" height="19.38834391229085" fill="#ef444466" stroke="#ef4444" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: VIN
 globalConnNetId: connectivity_net1
-available orientations: y+" data-x="-1.6004999999999998" data-y="0.75" x="46.42026009582477" y="217.81884553958474" width="12.776637006616482" height="19.16495550992471" fill="#ef444466" stroke="#ef4444" stroke-width="0.01565357142857143" />
+available orientations: y+" data-x="3.6340000000000003" data-y="-0.09899999999999995" x="378.261973456434" y="274.6959030582804" width="12.9255626081939" height="19.38834391229085" fill="#ef444466" stroke="#ef4444" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: VIN
 globalConnNetId: connectivity_net1
-available orientations: y+" data-x="2.9752723250000006" data-y="0.9500000000000005" x="338.7351702030573" y="205.04220853296823" width="12.776637006616454" height="19.16495550992471" fill="#ef444466" stroke="#ef4444" stroke-width="0.01565357142857143" />
+available orientations: y+" data-x="-1.5999999999999999" data-y="1.3499999999999999" x="39.999999999999986" y="181.05020196191572" width="12.9255626081939" height="19.38834391229082" fill="#ef444466" stroke="#ef4444" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: VOUT
 globalConnNetId: connectivity_net0
-available orientations: y+" data-x="6.2425" data-y="7.771561172376096e-16" x="547.4560803102897" y="262.53707506274236" width="12.776637006616397" height="25.553274013232908" fill="#ef444466" stroke="#ef4444" stroke-width="0.01565357142857143" />
+available orientations: y+" data-x="6.7" data-y="7.771561172376096e-16" x="576.4108482400462" y="265.0663589151759" width="12.9255626081939" height="25.8511252163878" fill="#ef444466" stroke="#ef4444" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: VOUT
 globalConnNetId: connectivity_net0
-available orientations: y+" data-x="1.501" data-y="1.2009999999999998" x="244.5539584759297" y="185.8133698380105" width="12.776637006616482" height="25.553274013232937" fill="#ef444466" stroke="#ef4444" stroke-width="0.01565357142857143" />
+available orientations: y+" data-x="1.551" data-y="0.851" x="243.64223889209464" y="210.068090017311" width="12.925562608193871" height="25.85112521638777" fill="#ef444466" stroke="#ef4444" stroke-width="0.015473214285714283" />
   </g>
   <g>
     <rect data-type="rect" data-label="netId: LDO_EN
 globalConnNetId: connectivity_net2
-available orientations: x-, x+" data-x="2.675272325000001" data-y="-0.5999999999999999" x="306.79357768651613" y="307.25530458590003" width="38.32991101984936" height="12.776637006616511" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.01565357142857143" />
+available orientations: x-, x+" data-x="2.675272325000001" data-y="-0.5999999999999999" x="303.3759379111368" y="310.30582804385455" width="38.7766878245817" height="12.9255626081939" fill="hsl(40, 100%, 50%, 0.35)" stroke="black" stroke-width="0.015473214285714283" />
   </g>
   <g id="crosshair" style="display: none">
     <line id="crosshair-h" y1="0" y2="640" stroke="#666" stroke-width="0.5" />
@@ -267,12 +264,12 @@ available orientations: x-, x+" data-x="2.675272325000001" data-y="-0.5999999999
 
       // Calculate real coordinates using inverse transformation
       const matrix = {
-        "a": 63.88318503308236,
+        "a": 64.62781304096943,
         "c": 0,
-        "e": 155.05361624458132,
+        "e": 149.867282169648,
         "b": 0,
-        "d": -63.88318503308236,
-        "f": 275.31371206935887
+        "d": -64.62781304096943,
+        "f": 277.99192152336985
       };
       // Manually invert and apply the affine transform
       // Since we only use translate and scale, we can directly compute:
diff --git a/tests/examples/__snapshots__/example27.snap.svg b/tests/examples/__snapshots__/example27.snap.svg
index 584ffe28..a4dd1618 100644
--- a/tests/examples/__snapshots__/example27.snap.svg
+++ b/tests/examples/__snapshots__/example27.snap.svg
@@ -171,10 +171,7 @@ orientation: y-" data-x="-1.3" data-y="-0.10000000000000009" cx="240.86956521739
     <polyline data-points="0.2,1.4 3.4,-0.7" data-type="line" data-label="" points="332.17391304347825,228.69565217391306 526.9565217391305,356.5217391304348" fill="none" stroke="hsl(199, 100%, 50%, 0.8)" stroke-width="1" stroke-dasharray="4 2" />
   </g>
   <g>
-    <polyline data-points="0,-1.4 0,-1.5999999999999999 -1.7,-1.5999999999999999 -1.7,-0.8999999999999999 -3.4,-0.8999999999999999" data-type="line" data-label="" points="320,399.1304347826087 320,411.304347826087 216.52173913043475,411.304347826087 216.52173913043475,368.69565217391306 113.04347826086953,368.69565217391306" fill="none" stroke="black" stroke-width="1" />
-  </g>
-  <g>
-    <polyline data-points="3.4,-0.8999999999999999 1.6999999999999997,-0.8999999999999999 1.6999999999999997,-1.5999999999999999 0,-1.5999999999999999 0,-1.4" data-type="line" data-label="" points="526.9565217391305,368.69565217391306 423.47826086956525,368.69565217391306 423.47826086956525,411.304347826087 320,411.304347826087 320,399.1304347826087" fill="none" stroke="black" stroke-width="1" />
+    <polyline data-points="-3.4,-0.8999999999999999 -1.7,-0.8999999999999999 -1.7,-1.5999999999999999 0,-1.5999999999999999 0,-1.4" data-type="line" data-label="" points="113.04347826086953,368.69565217391306 216.52173913043475,368.69565217391306 216.52173913043475,411.304347826087 320,411.304347826087 320,399.1304347826087" fill="none" stroke="black" stroke-width="1" />
   </g>
   <g>
     <polyline data-points="-3.4,-0.49999999999999994 -1.3,-0.5" data-type="line" data-label="" points="113.04347826086953,344.3478260869565 240.8695652173913,344.3478260869565" fill="none" stroke="black" stroke-width="1" />
diff --git a/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts b/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts
new file mode 100644
index 00000000..1bb9e7f7
--- /dev/null
+++ b/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts
@@ -0,0 +1,71 @@
+import { test, expect } from "bun:test"
+import type { InputProblem } from "lib/types/InputProblem"
+import { MspConnectionPairSolver } from "lib/solvers/MspConnectionPairSolver/MspConnectionPairSolver"
+
+/**
+ * Regression test for issue #79.
+ *
+ * When a net (e.g. VCC) connects pins A.1 and B.1 via netConnections, and A.1 is
+ * also part of a direct wire connection, the shared-reference bug in
+ * getConnectivityMapsFromInputProblem caused B.1 to be merged into the direct-wire
+ * net — resulting in spurious MSP pairs (and therefore spurious wire traces) that
+ * included B.1.
+ *
+ * After the fix (cloning directConnMap.netMap before passing to netConnMap), the
+ * direct-wire net only contains A.1 and A.2. B.1 is only reachable via the global
+ * (net-label) connectivity and should NOT generate a wire trace.
+ */
+test("MspConnectionPairSolver_repro79 - no spurious pairs for net-label-only pins", () => {
+  // A.1 and A.2 are directly wired (should produce exactly one MSP pair)
+  // VCC net labels connect A.1 and B.1 (B.1 should NOT get a wire trace)
+  const inputProblem: InputProblem = {
+    chips: [
+      {
+        chipId: "A",
+        center: { x: 0, y: 0 },
+        width: 1,
+        height: 1,
+        pins: [
+          { pinId: "A.1", x: -0.5, y: 0 },
+          { pinId: "A.2", x: 0.5, y: 0 },
+        ],
+      },
+      {
+        chipId: "B",
+        center: { x: 3, y: 0 },
+        width: 1,
+        height: 1,
+        pins: [
+          { pinId: "B.1", x: 2.5, y: 0 },
+        ],
+      },
+    ],
+    directConnections: [
+      // Direct wire: A.1 -- A.2
+      { pinIds: ["A.1", "A.2"] },
+    ],
+    netConnections: [
+      // VCC label: connects A.1 and B.1 (no wire trace should be added for B.1)
+      { netId: "VCC", pinIds: ["A.1", "B.1"] },
+    ],
+  }
+
+  const solver = new MspConnectionPairSolver({ inputProblem })
+  solver.solve()
+
+  expect(solver.solved).toBe(true)
+
+  // Only the direct wire pair A.1--A.2 should exist.
+  // B.1 must NOT appear in any MSP pair since it is connected only via net label.
+  const pairPinIds = solver.mspConnectionPairs.flatMap((p) =>
+    p.pins.map((pin) => pin.pinId),
+  )
+
+  expect(pairPinIds).not.toContain("B.1")
+
+  // Exactly one pair: A.1 <-> A.2
+  expect(solver.mspConnectionPairs).toHaveLength(1)
+  const pair = solver.mspConnectionPairs[0]!
+  const pairIds = pair.pins.map((p) => p.pinId).sort()
+  expect(pairIds).toEqual(["A.1", "A.2"])
+})

From d0e32937a5d2b2c05b2d7a5ea76ee42ce2a9b9ed Mon Sep 17 00:00:00 2001
From: Wilson Xu <chengyi_xu@outlook.com>
Date: Mon, 4 May 2026 22:08:44 +0800
Subject: [PATCH 2/2] fix(test): add missing availableNetLabelOrientations to
 MspConnectionPairSolver_repro79 test

---
 .../MspConnectionPairSolver_repro79.test.ts                | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts b/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts
index 1bb9e7f7..1fa3dac4 100644
--- a/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts
+++ b/tests/solvers/MspConnectionPairSolver/MspConnectionPairSolver_repro79.test.ts
@@ -35,9 +35,7 @@ test("MspConnectionPairSolver_repro79 - no spurious pairs for net-label-only pin
         center: { x: 3, y: 0 },
         width: 1,
         height: 1,
-        pins: [
-          { pinId: "B.1", x: 2.5, y: 0 },
-        ],
+        pins: [{ pinId: "B.1", x: 2.5, y: 0 }],
       },
     ],
     directConnections: [
@@ -48,6 +46,9 @@ test("MspConnectionPairSolver_repro79 - no spurious pairs for net-label-only pin
       // VCC label: connects A.1 and B.1 (no wire trace should be added for B.1)
       { netId: "VCC", pinIds: ["A.1", "B.1"] },
     ],
+    availableNetLabelOrientations: {
+      VCC: ["x+", "x-", "y+", "y-"],
+    },
   }
 
   const solver = new MspConnectionPairSolver({ inputProblem })