👍 Add DenopsStub class to stub denops for tests.

denops_test/conf.ts

@@ -1,21 +1,29 @@
-import * as path from "https://deno.land/std@0.187.0/path/mod.ts";
+import * as path from "https://deno.land/std@0.190.0/path/mod.ts";
 import { orElse } from "./or_else.ts";
 
-function get(name: string): string | undefined {
-  return Deno.env.get(`DENOPS_TEST_${name}`);
-}
+let conf: Config | undefined;
 
-/** Absolute local path of denops added to Vim runtimepath */
-export const DENOPS_PATH = path.resolve(
-  orElse(get("DENOPS_PATH"), () => {
-    throw new Error(
-      "Environment variable 'DENOPS_TEST_DENOPS_PATH' is required",
-    );
-  }),
-);
+export type Config = {
+  denopsPath: string;
+  vimExecutable: string;
+  nvimExecutable: string;
+};
 
-/** Executable name of Vim */
-export const VIM_EXECUTABLE = get("VIM_EXECUTABLE") ?? "vim";
+export function getConfig(): Config {
+  if (!conf) {
+    conf = {
+      denopsPath: path.resolve(orElse(get("DENOPS_PATH"), () => {
+        throw new Error(
+          "Environment variable 'DENOPS_TEST_DENOPS_PATH' is required",
+        );
+      })),
+      vimExecutable: get("VIM_EXECUTABLE") ?? "vim",
+      nvimExecutable: get("NVIM_EXECUTABLE") ?? "nvim",
+    };
+  }
+  return conf;
+}
 
-/** Executable name of Neovim */
-export const NVIM_EXECUTABLE = get("NVIM_EXECUTABLE") ?? "nvim";
+function get(name: string): string | undefined {
+  return Deno.env.get(`DENOPS_TEST_${name}`);
+}

denops_test/mod.ts

@@ -25,9 +25,29 @@
  *   },
  * });
  * ```
+ *
+ * Use `DenopsStub` class to create a stub instance of `Denops` interface
+ * if no real Vim/Neovim behavior is required for the tests.
+ *
+ * ```typescript
+ * import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+ * import { DenopsStub } from "./mod.ts";
+ *
+ * Deno.test("denops.call", async () => {
+ *   const denops = new DenopsStub({
+ *     call: (fn, ...args) => {
+ *       return Promise.resolve([fn, ...args]);
+ *     },
+ *   });
+ *   assertEquals(await denops.call("foo", "bar"), ["foo", "bar"]);
+ * });
+ * ```
+ *
  * @module
  */
+export type { DenopsStubber } from "./stub.ts";
 export type { TestDefinition } from "./tester.ts";
 export type { WithDenopsOptions } from "./with.ts";
+export { DenopsStub } from "./stub.ts";
 export { test } from "./tester.ts";
 export { withDenops } from "./with.ts";

denops_test/runner.ts

@@ -1,4 +1,4 @@
-import { NVIM_EXECUTABLE, VIM_EXECUTABLE } from "./conf.ts";
+import { getConfig } from "./conf.ts";
 
 /** Runner mode */
 export type RunMode = "vim" | "nvim";
@@ -46,15 +46,16 @@ export function isRunMode(mode: string): mode is RunMode {
 }
 
 function buildArgs(mode: RunMode): [string, string[]] {
+  const conf = getConfig();
   switch (mode) {
     case "vim":
       return [
-        VIM_EXECUTABLE,
+        conf.vimExecutable,
         ["-u", "NONE", "-i", "NONE", "-n", "-N", "-X", "-e", "-s"],
       ];
     case "nvim":
       return [
-        NVIM_EXECUTABLE,
+        conf.nvimExecutable,
         ["--clean", "--embed", "--headless", "-n"],
       ];
   }

denops_test/stub.ts

@@ -0,0 +1,181 @@
+import {
+  Context,
+  Denops,
+  Dispatcher,
+  Meta,
+} from "https://deno.land/x/[email protected]/mod.ts";
+
+/**
+ * Represents a `Denops` stubber object.
+ */
+export type DenopsStubber = {
+  /**
+   * Denops instance name whihc uses to communicate with vim.
+   *
+   * If not specified, the default value is `denops-test-stub`.
+   */
+  name?: string;
+  /**
+   * Environment meta information.
+   *
+   * If not specified, the default value is:
+   * ```json
+   * {
+   *   "mode": "release",
+   *   "host": "vim",
+   *   "version": "0.0.0",
+   *   "platform": "linux"
+   * }
+   * ```
+   */
+  meta?: Meta;
+  /**
+   * A stub function of `redraw` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to undefined.
+   */
+  redraw?: (force?: boolean) => Promise<void>;
+  /**
+   * A stub function of `call` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to undefined.
+   */
+  call?(fn: string, ...args: unknown[]): Promise<unknown>;
+  /**
+   * A stub function of `batch` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to an empty list.
+   */
+  batch?(...calls: [string, ...unknown[]][]): Promise<unknown[]>;
+  /**
+   * A stub function of `cmd` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to undefined.
+   */
+  cmd?(cmd: string, ctx: Context): Promise<void>;
+  /**
+   * A stub function of `eval` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to undefined.
+   */
+  eval?(expr: string, ctx: Context): Promise<unknown>;
+  /**
+   * A stub function of `dispatch` method of the `Denops`.
+   *
+   * If not specified, it returns a promise resolves to undefined.
+   */
+  dispatch?(name: string, fn: string, ...args: unknown[]): Promise<unknown>;
+  /**
+   * Indicates whether to use `call` function in `batch` method.
+   */
+  useCallInBatch?: boolean;
+  /**
+   * Indicates whether to use `call` function in `cmd` method.
+   */
+  useCallInCmd?: boolean;
+  /**
+   * Indicates whether to use `call` function in `eval` method.
+   */
+  useCallInEval?: boolean;
+};
+
+/**
+ * Represents a `Denops` stub object.
+ */
+export class DenopsStub implements Denops {
+  readonly context: Record<string | number | symbol, unknown> = {};
+  dispatcher: Dispatcher = {};
+
+  #stubber: DenopsStubber;
+
+  /**
+   * Creates a new instance of DenopsStub.
+   * @param stubber - The Denops stubber object.
+   */
+  constructor(stubber: DenopsStubber = {}) {
+    this.#stubber = stubber;
+  }
+
+  get name(): string {
+    return this.#stubber.name ?? "denops-test-stub";
+  }
+
+  get meta(): Meta {
+    return this.#stubber.meta ?? {
+      mode: "release",
+      host: "vim",
+      version: "0.0.0",
+      platform: "linux",
+    };
+  }
+
+  redraw(force?: boolean): Promise<void> {
+    if (this.#stubber.redraw) {
+      return this.#stubber.redraw(force);
+    }
+    return Promise.resolve();
+  }
+
+  call(fn: string, ...args: unknown[]): Promise<unknown> {
+    if (this.#stubber.call) {
+      args = normArgs(args);
+      return this.#stubber.call(fn, ...args);
+    }
+    return Promise.resolve();
+  }
+
+  batch(...calls: [string, ...unknown[]][]): Promise<unknown[]> {
+    if (this.#stubber.batch) {
+      calls = calls.map(([fn, ...args]) => [fn, ...normArgs(args)]);
+      return this.#stubber.batch(...calls);
+    }
+    if (this.#stubber.call && this.#stubber.useCallInBatch) {
+      return Promise.all(
+        calls.map(([fn, ...args]) => this.call(fn, ...args)),
+      );
+    }
+    return Promise.resolve(calls.map(() => undefined));
+  }
+
+  cmd(cmd: string, ctx: Context = {}): Promise<void> {
+    if (this.#stubber.cmd) {
+      return this.#stubber.cmd(cmd, ctx);
+    }
+    if (this.#stubber.call && this.#stubber.useCallInCmd) {
+      return this.call("denops#api#cmd", cmd, ctx).then(() => {});
+    }
+    return Promise.resolve();
+  }
+
+  eval(expr: string, ctx: Context = {}): Promise<unknown> {
+    if (this.#stubber.eval) {
+      return this.#stubber.eval(expr, ctx);
+    }
+    if (this.#stubber.call && this.#stubber.useCallInEval) {
+      return this.call("denops#api#eval", expr, ctx);
+    }
+    return Promise.resolve();
+  }
+
+  dispatch(
+    name: string,
+    fn: string,
+    ...args: unknown[]
+  ): Promise<unknown> {
+    if (this.#stubber.dispatch) {
+      return this.#stubber.dispatch(name, fn, ...args);
+    }
+    return Promise.resolve();
+  }
+}
+
+function normArgs(args: unknown[]): unknown[] {
+  const normArgs = [];
+  for (const arg of args) {
+    if (arg === undefined) {
+      break;
+    }
+    normArgs.push(arg);
+  }
+  return normArgs;
+}