From 4182cdffb984d3908f67ad5a52a224aadd5e17d3 Mon Sep 17 00:00:00 2001
From: mohan-bee <mohn08052006@gmail.com>
Date: Fri, 31 Jul 2026 04:51:39 +0530
Subject: [PATCH] add simple RC chain repro

---
 tests/assets/repro-simple-rc-chain.input.json | 148 ++++++++++++++++++
 .../repro-simple-rc-chain.snap.svg            |  44 ++++++
 tests/repros/repro-simple-rc-chain.test.ts    |  11 ++
 3 files changed, 203 insertions(+)
 create mode 100644 tests/assets/repro-simple-rc-chain.input.json
 create mode 100644 tests/repros/__snapshots__/repro-simple-rc-chain.snap.svg
 create mode 100644 tests/repros/repro-simple-rc-chain.test.ts

diff --git a/tests/assets/repro-simple-rc-chain.input.json b/tests/assets/repro-simple-rc-chain.input.json
new file mode 100644
index 0000000..98cc384
--- /dev/null
+++ b/tests/assets/repro-simple-rc-chain.input.json
@@ -0,0 +1,148 @@
+{
+  "chipMap": {
+    "R1": {
+      "chipId": "R1",
+      "pins": ["R1.1", "R1.2"],
+      "size": {
+        "x": 1.1,
+        "y": 0.388910699999999
+      },
+      "availableRotations": [0, 90, 180, 270]
+    },
+    "C1": {
+      "chipId": "C1",
+      "pins": ["C1.1", "C1.2"],
+      "size": {
+        "x": 1.1,
+        "y": 0.84
+      },
+      "availableRotations": [270]
+    },
+    "U1": {
+      "chipId": "U1",
+      "pins": ["U1.1", "U1.2", "U1.3", "U1.4", "U1.5", "U1.6", "U1.7", "U1.8"],
+      "size": {
+        "x": 1.6,
+        "y": 1.7999999999999998
+      },
+      "availableRotations": [0]
+    }
+  },
+  "chipPinMap": {
+    "R1.1": {
+      "pinId": "R1.1",
+      "offset": {
+        "x": -0.55,
+        "y": 0
+      },
+      "side": "x-"
+    },
+    "R1.2": {
+      "pinId": "R1.2",
+      "offset": {
+        "x": 0.55,
+        "y": 0
+      },
+      "side": "x+"
+    },
+    "C1.1": {
+      "pinId": "C1.1",
+      "offset": {
+        "x": -0.55,
+        "y": 0
+      },
+      "side": "x-"
+    },
+    "C1.2": {
+      "pinId": "C1.2",
+      "offset": {
+        "x": 0.55,
+        "y": 0
+      },
+      "side": "x+"
+    },
+    "U1.1": {
+      "pinId": "U1.1",
+      "offset": {
+        "x": -1.2000000000000002,
+        "y": 0.30000000000000004
+      },
+      "side": "x-"
+    },
+    "U1.2": {
+      "pinId": "U1.2",
+      "offset": {
+        "x": -1.2000000000000002,
+        "y": 0.10000000000000003
+      },
+      "side": "x-"
+    },
+    "U1.3": {
+      "pinId": "U1.3",
+      "offset": {
+        "x": -1.2000000000000002,
+        "y": -0.09999999999999998
+      },
+      "side": "x-"
+    },
+    "U1.4": {
+      "pinId": "U1.4",
+      "offset": {
+        "x": -1.2000000000000002,
+        "y": -0.30000000000000004
+      },
+      "side": "x-"
+    },
+    "U1.5": {
+      "pinId": "U1.5",
+      "offset": {
+        "x": 1.2000000000000002,
+        "y": -0.30000000000000004
+      },
+      "side": "x+"
+    },
+    "U1.6": {
+      "pinId": "U1.6",
+      "offset": {
+        "x": 1.2000000000000002,
+        "y": -0.10000000000000003
+      },
+      "side": "x+"
+    },
+    "U1.7": {
+      "pinId": "U1.7",
+      "offset": {
+        "x": 1.2000000000000002,
+        "y": 0.09999999999999998
+      },
+      "side": "x+"
+    },
+    "U1.8": {
+      "pinId": "U1.8",
+      "offset": {
+        "x": 1.2000000000000002,
+        "y": 0.30000000000000004
+      },
+      "side": "x+"
+    }
+  },
+  "netMap": {
+    "unnamedsubcircuitsubcircuit_source_group_0_connectivity_net2": {
+      "netId": "unnamedsubcircuitsubcircuit_source_group_0_connectivity_net2",
+      "isGround": true,
+      "isPositiveVoltageSource": false
+    }
+  },
+  "pinStrongConnMap": {
+    "U1.2-R1.1": true,
+    "R1.1-U1.2": true,
+    "R1.2-C1.1": true,
+    "C1.1-R1.2": true
+  },
+  "netConnMap": {
+    "C1.2-unnamedsubcircuitsubcircuit_source_group_0_connectivity_net2": true
+  },
+  "chipGap": 0.6,
+  "decouplingCapsGap": 0.4,
+  "partitionGap": 1.2
+}
diff --git a/tests/repros/__snapshots__/repro-simple-rc-chain.snap.svg b/tests/repros/__snapshots__/repro-simple-rc-chain.snap.svg
new file mode 100644
index 0000000..f08c687
--- /dev/null
+++ b/tests/repros/__snapshots__/repro-simple-rc-chain.snap.svg
@@ -0,0 +1,44 @@
+<svg width="640" height="640" viewBox="0 0 640 640" xmlns="http://www.w3.org/2000/svg"><rect width="100%" height="100%" fill="white"/><g><polyline data-points="-1.2000000000000002,0.10000000000000003 -1.9000000000000001,-0.09999999999999998" data-type="line" data-label="" points="225.6842105263158,157.89473684210526 122.5263157894737,187.36842105263156" fill="none" stroke="black" stroke-width="1px"/></g><g><polyline data-points="-1.9000000000000001,-1.2000000000000002 -1.9000000000000001,-1.8" data-type="line" data-label="" points="122.5263157894737,349.4736842105263 122.5263157894737,437.8947368421052" fill="none" stroke="black" stroke-width="1px"/></g><g><rect data-type="rect" data-label="R1" data-x="-1.9000000000000001" data-y="-0.65" x="93.86973789473693" y="187.3684210526316" width="57.31315578947354" height="162.10526315789474" fill="rgba(16, 185, 129, 0.18)" stroke="none" stroke-width="0.006785714285714286"/></g><g><rect data-type="rect" data-label="C1" data-x="-1.9000000000000001" data-y="-2.35" x="60.63157894736844" y="437.8947368421052" width="123.78947368421052" height="162.1052631578948" fill="rgba(59, 130, 246, 0.18)" stroke="none" stroke-width="0.006785714285714286"/></g><g><rect data-type="rect" data-label="U1" data-x="0" data-y="0" x="284.63157894736844" y="40.00000000000003" width="235.78947368421052" height="265.26315789473676" fill="rgba(245, 158, 11, 0.18)" stroke="none" stroke-width="0.006785714285714286"/></g><text data-type="text" data-label="R1" data-x="-1.9000000000000001" data-y="-0.65" x="122.5263157894737" y="268.42105263157896" fill="black" font-size="12.608894273684177" font-family="sans-serif" text-anchor="middle" dominant-baseline="central">R1</text><text data-type="text" data-label="C1" data-x="-1.9000000000000001" data-y="-2.35" x="122.5263157894737" y="518.9473684210526" fill="black" font-size="27.233684210526313" font-family="sans-serif" text-anchor="middle" dominant-baseline="central">C1</text><text data-type="text" data-label="U1" data-x="0" data-y="0" x="402.5263157894737" y="172.6315789473684" fill="black" font-size="51.57894736842104" font-family="sans-serif" text-anchor="middle" dominant-baseline="central">U1</text><g><circle data-type="point" data-label="R1.1" data-x="-1.9000000000000001" data-y="-0.09999999999999998" cx="122.5263157894737" cy="187.36842105263156" r="3" fill="black"/></g><g><circle data-type="point" data-label="R1.2" data-x="-1.9000000000000001" data-y="-1.2000000000000002" cx="122.5263157894737" cy="349.4736842105263" r="3" fill="black"/></g><g><circle data-type="point" data-label="C1.1" data-x="-1.9000000000000001" data-y="-1.8" cx="122.5263157894737" cy="437.8947368421052" r="3" fill="black"/></g><g><circle data-type="point" data-label="C1.2 (unnamedsubcircuitsubcircuit_source_group_0_connectivity_net2)" data-x="-1.9000000000000001" data-y="-2.9000000000000004" cx="122.5263157894737" cy="600" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.1" data-x="-1.2000000000000002" data-y="0.30000000000000004" cx="225.6842105263158" cy="128.42105263157893" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.2" data-x="-1.2000000000000002" data-y="0.10000000000000003" cx="225.6842105263158" cy="157.89473684210526" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.3" data-x="-1.2000000000000002" data-y="-0.09999999999999998" cx="225.6842105263158" cy="187.36842105263156" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.4" data-x="-1.2000000000000002" data-y="-0.30000000000000004" cx="225.6842105263158" cy="216.8421052631579" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.5" data-x="1.2000000000000002" data-y="-0.30000000000000004" cx="579.3684210526316" cy="216.8421052631579" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.6" data-x="1.2000000000000002" data-y="-0.10000000000000003" cx="579.3684210526316" cy="187.36842105263156" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.7" data-x="1.2000000000000002" data-y="0.09999999999999998" cx="579.3684210526316" cy="157.89473684210526" r="3" fill="black"/></g><g><circle data-type="point" data-label="U1.8" data-x="1.2000000000000002" data-y="0.30000000000000004" cx="579.3684210526316" cy="128.42105263157893" r="3" fill="black"/></g><g id="crosshair" style="display: none"><line id="crosshair-h" y1="0" y2="640" stroke="#666" stroke-width="0.5"/><line id="crosshair-v" x1="0" x2="640" stroke="#666" stroke-width="0.5"/><text id="coordinates" font-family="monospace" font-size="12" fill="#666"></text></g><script><![CDATA[
+              document.currentScript.parentElement.addEventListener('mousemove', (e) => {
+                const svg = e.currentTarget;
+                const rect = svg.getBoundingClientRect();
+                const x = e.clientX - rect.left;
+                const y = e.clientY - rect.top;
+                const crosshair = svg.getElementById('crosshair');
+                const h = svg.getElementById('crosshair-h');
+                const v = svg.getElementById('crosshair-v');
+                const coords = svg.getElementById('coordinates');
+
+                crosshair.style.display = 'block';
+                h.setAttribute('x1', '0');
+                h.setAttribute('x2', '640');
+                h.setAttribute('y1', y);
+                h.setAttribute('y2', y);
+                v.setAttribute('x1', x);
+                v.setAttribute('x2', x);
+                v.setAttribute('y1', '0');
+                v.setAttribute('y2', '640');
+
+                // Calculate real coordinates using inverse transformation
+                const matrix = {"a":147.36842105263156,"c":0,"e":402.5263157894737,"b":0,"d":-147.36842105263156,"f":172.6315789473684};
+                // Manually invert and apply the affine transform
+                // Since we only use translate and scale, we can directly compute:
+                // x' = (x - tx) / sx
+                // y' = (y - ty) / sy
+                const sx = matrix.a;
+                const sy = matrix.d;
+                const tx = matrix.e;
+                const ty = matrix.f;
+                const realPoint = {
+                  x: (x - tx) / sx,
+                  y: (y - ty) / sy // Flip y back since we used negative scale
+                }
+
+                coords.textContent = `(${realPoint.x.toFixed(2)}, ${realPoint.y.toFixed(2)})`;
+                coords.setAttribute('x', (x + 5).toString());
+                coords.setAttribute('y', (y - 5).toString());
+              });
+              document.currentScript.parentElement.addEventListener('mouseleave', () => {
+                document.currentScript.parentElement.getElementById('crosshair').style.display = 'none';
+              });
+            ]]></script></svg>
\ No newline at end of file
diff --git a/tests/repros/repro-simple-rc-chain.test.ts b/tests/repros/repro-simple-rc-chain.test.ts
new file mode 100644
index 0000000..2770085
--- /dev/null
+++ b/tests/repros/repro-simple-rc-chain.test.ts
@@ -0,0 +1,11 @@
+import { expect, test } from "bun:test"
+import { LayoutPipelineSolver } from "../../lib/solvers/LayoutPipelineSolver/LayoutPipelineSolver"
+import type { InputProblem } from "../../lib/types/InputProblem"
+import input from "../assets/repro-simple-rc-chain.input.json"
+
+test("simple RC chain", async () => {
+  const solver = new LayoutPipelineSolver(input as InputProblem)
+  solver.solve()
+
+  await expect(solver).toMatchSolverSnapshot(import.meta.path)
+})