Checkpoint web parity through Chromium input tasks

web/tests/unit/obj-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(), "obj-import-unit-"));
+const sourcePath = path.join(root, "web/protocol/obj-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, "obj-import.mjs");
+fs.writeFileSync(modulePath, transpiled.outputText);
+const protocol = await import(pathToFileURL(modulePath));
+
+const obj = new TextEncoder().encode(`# test\nmtllib materials.mtl\no Test\nv 0 0 0\nv 1 0 0\nv 0 1 0\nvt 0 0\nvt 1 0\nvt 0 1\nvn 0 0 1\ng TestGroup\nusemtl TestMaterial\nf -3/-3/-1 -2/-2/-1 -1/-1/-1\n`).buffer;
+const mtl = new TextEncoder().encode("newmtl TestMaterial\nmap_Kd texture.png\n").buffer;
+
+test("M12-07C resolves negative indices and serializes deterministic OBJ", () => {
+  const imported = protocol.importOBJ(obj, mtl);
+  assert.deepEqual(imported.faces[0].vertices.map((vertex) => vertex.position), [1, 2, 3]);
+  assert.deepEqual(imported.faces[0].vertices.map((vertex) => vertex.texcoord), [1, 2, 3]);
+  assert.deepEqual(imported.materials, [{ name: "TestMaterial", mapKd: "texture.png" }]);
+  const serialized = protocol.serializeOBJ(imported);
+  assert.match(serialized.obj, /f 1\/1\/1 2\/2\/1 3\/3\/1/);
+  assert.equal(serialized.mtl, "# Web Blender MTL export\n# schema 1\nnewmtl TestMaterial\nmap_Kd texture.png\n");
+});
+
+test("M12-07C reports unresolved texture origin without blocking geometry", () => {
+  const imported = protocol.importOBJ(obj, mtl);
+  const missing = protocol.createOBJLossReport(imported);
+  assert.equal(missing.canRoundTrip, true);
+  assert.deepEqual(missing.warnings.map((warning) => warning.code), ["OBJ_TEXTURE_ORIGIN_UNRESOLVED"]);
+  const bound = protocol.createOBJLossReport(imported, ["texture.png"]);
+  assert.deepEqual(bound.warnings, []);
+});
+
+test("M12-07C rejects malformed face arity and out-of-range indices", () => {
+  const malformed = new TextEncoder().encode("v 0 0 0\nv 1 0 0\nv 0 1 0\nf 1 2\n").buffer;
+  assert.throws(() => protocol.importOBJ(malformed), /OBJ_FACE_ARITY_INVALID/);
+  const outOfRange = new TextEncoder().encode("v 0 0 0\nv 1 0 0\nv 0 1 0\nf 1 2 4\n").buffer;
+  assert.throws(() => protocol.importOBJ(outOfRange), /OBJ_INDEX_OUT_OF_RANGE/);
+});
+
+test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));