import { describe, expect, it } from "bun:test";import { chmodSync, mkdtempSync, writeFileSync } from "node:fs";import { tmpdir } from "node:os";import { join } from "node:path";import type { Config } from "../../../config/env";import { asRecipeId } from "../../../types/brand";import type { Recipe } from "../../models/types";import { buildBackendCommand } from "./backend-builder"; const baseRecipe: Recipe = {  id: asRecipeId("r1"),  name: "custom",  model_path: "/models/test",  backend: "sglang",  env_vars: null,  tensor_parallel_size: 1,  pipeline_parallel_size: 1,  max_model_len: 32768,  gpu_memory_utilization: 0.9,  kv_cache_dtype: "auto",  max_num_seqs: 256,  trust_remote_code: true,  tool_call_parser: null,  reasoning_parser: null,  enable_auto_tool_choice: false,  quantization: null,  dtype: null,  host: "0.0.0.0",  port: 8000,  served_model_name: null,  python_path: null,  extra_args: {},  max_thinking_tokens: null,  thinking_mode: "conservative",}; const fakeExecutable = (name: string): string => {  const path = join(mkdtempSync(join(tmpdir(), "backend-builder-")), name);  writeFileSync(path, "#!/bin/sh\nexit 0\n");  chmodSync(path, 0o755);  return path;}; describe("backend builder command overrides", () => {  it("uses launch_command as the full launch argv", () => {    const command = buildBackendCommand(      {        ...baseRecipe,        extra_args: {          launch_command:            "python -m sglang.launch_server --model-path /models/custom --grammar-backend xgrammar",        },      },      {} as Config    );     expect(command).toEqual([      "python",      "-m",      "sglang.launch_server",      "--model-path",      "/models/custom",      "--grammar-backend",      "xgrammar",    ]);  });   it("normalizes multiline command continuations from the editor", () => {    const command = buildBackendCommand(      {        ...baseRecipe,        extra_args: {          launch_command:            "python -m sglang.launch_server \\\n+  --model-path '/models/custom model' \\\n+  --enable-metrics",        },      },      {} as Config    );     expect(command).toEqual([      "python",      "-m",      "sglang.launch_server",      "--model-path",      "/models/custom model",      "--enable-metrics",    ]);  });   it("rejects shell interpreters for exllamav3 commands", () => {    expect(() =>      buildBackendCommand(        {          ...baseRecipe,          backend: "exllamav3",          extra_args: { exllama_command: "sh -c echo-pwned" },        },        {} as Config      )    ).toThrow("Invalid exllama_command");  });   it("accepts resolved ExLLaMA executables", () => {    const executable = fakeExecutable("exllama-server");    const command = buildBackendCommand(      {        ...baseRecipe,        backend: "exllamav3",        extra_args: { exllama_command: `"${executable}"` },      },      {} as Config    );     expect(command[0]).toBe(executable);    expect(command).toContain("--model");    expect(command).toContain("/models/test");  });   it("rejects non llama-server llama.cpp overrides", () => {    expect(() =>      buildBackendCommand(        {          ...baseRecipe,          backend: "llamacpp",          extra_args: { llama_bin: "/bin/sh" },        },        {} as Config      )    ).toThrow("Invalid llama_bin");  });   it("accepts resolved llama-server overrides", () => {    const executable = fakeExecutable("llama-server");    const command = buildBackendCommand(      {        ...baseRecipe,        backend: "llamacpp",        extra_args: { llama_bin: executable },      },      {} as Config    );     expect(command[0]).toBe(executable);    expect(command).toContain("--model");    expect(command).toContain("/models/test");  });});