Checkpoint web parity through Chromium input tasks

web/tests/unit/stl-import.test.mjs

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+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+import test from "node:test";
+import ts from "typescript";
+
+const root = path.resolve(import.meta.dirname, "../../..");
+const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "stl-import-unit-"));
+const sourcePath = path.join(root, "web/protocol/stl-import.ts");
+const transpiled = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
+  compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
+  fileName: sourcePath,
+  reportDiagnostics: true,
+});
+assert.deepEqual(transpiled.diagnostics, []);
+const modulePath = path.join(temporary, "stl-import.mjs");
+fs.writeFileSync(modulePath, transpiled.outputText);
+const protocol = await import(pathToFileURL(modulePath));
+const fixtureRoot = path.join(root, "tests/files/web/m12_stl_edges_v1");
+const bytes = (name) => {
+  const value = fs.readFileSync(path.join(fixtureRoot, name));
+  return value.buffer.slice(value.byteOffset, value.byteOffset + value.byteLength);
+};
+
+test("M12-07E parses binary/ASCII normals and explicit unit scales", () => {
+  const binary = protocol.importSTL(bytes("capability-binary.stl"), { variant: "STL_BINARY", unitScale: 1 });
+  assert.equal(binary.triangleCount, 2);
+  assert.deepEqual(binary.normals, [[0, 1, 0], [0, 1, 0]]);
+  assert.deepEqual(binary.bounds, { min: [-1, 0, -1], max: [1, 0, 1] });
+  const scaled = protocol.importSTL(bytes("capability-binary.stl"), { variant: "STL_BINARY", unitScale: 0.001 });
+  assert.deepEqual(scaled.bounds, { min: [-0.001, 0, -0.001], max: [0.001, 0, 0.001] });
+  const ascii = protocol.importSTL(bytes("../m12_stl_capability_v1/capability-ascii.stl"), { variant: "STL_ASCII", unitScale: 1 });
+  assert.equal(ascii.triangleCount, 2);
+  assert.deepEqual(ascii.normals, binary.normals);
+  assert.deepEqual(ascii.bounds, binary.bounds);
+});
+
+test("M12-07E matches Blender's degenerate removal and blocks trailing bytes", () => {
+  const degenerate = protocol.importSTL(bytes("degenerate-binary.stl"), { variant: "STL_BINARY", unitScale: 1 });
+  assert.equal(degenerate.declaredTriangleCount, 2);
+  assert.equal(degenerate.removedDegenerateTriangles, 1);
+  assert.equal(degenerate.triangleCount, 1);
+  assert.throws(() => protocol.importSTL(bytes("trailing-binary.stl"), { variant: "STL_BINARY", unitScale: 1 }), /STL_TRAILING_BYTES/);
+  assert.throws(() => protocol.importSTL(bytes("capability-binary.stl"), { variant: "STL_BINARY", unitScale: 0 }), /STL_UNIT_SCALE_INVALID/);
+});
+
+test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));