Checkpoint web parity through Chromium input tasks

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

@@ -0,0 +1,42 @@
+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-export-unit-"));
+const sourcePath = path.join(root, "web/protocol/stl-export.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-export.mjs");
+fs.writeFileSync(modulePath, transpiled.outputText);
+const protocol = await import(pathToFileURL(modulePath));
+const document = {
+  schemaVersion: 1,
+  variant: "STL_BINARY",
+  unitScale: 1,
+  declaredTriangleCount: 1,
+  triangleCount: 1,
+  removedDegenerateTriangles: 0,
+  normals: [[0, 1, 0]],
+  vertices: [[[-1, 0, 1], [1, 0, 1], [1, 0, -1]]],
+  bounds: { min: [-1, 0, -1], max: [1, 0, 1] },
+};
+
+test("M12-07F serializes binary STL and reports material loss", () => {
+  const output = protocol.exportBinarySTL(document);
+  assert.equal(output.byteLength, 134);
+  assert.equal(new DataView(output).getUint32(80, true), 1);
+  assert.deepEqual(protocol.createSTLLossReport(2), {
+    schemaVersion: 1,
+    operation: "STL_EXPORT_LOSS_REPORT",
+    canRoundTrip: true,
+    warningCount: 1,
+    warnings: [{ code: "STL_MATERIAL_UNSUPPORTED", severity: "warning", message: "STL has no material slots; 2 source material assignments are omitted" }],
+  });
+});
+
+test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));