Create test helper

Author: tmcw

src/autocomplete/getAutocompletion.test.ts

@@ -1,25 +1,10 @@
 import { describe, expect, it } from "vitest";
 import { getAutocompletion } from "./getAutocompletion.js";
-import {
-  createSystem,
-  createVirtualTypeScriptEnvironment,
-} from "@typescript/vfs";
-import ts from "typescript";
-import * as Fs from "node:fs";
-
-const fsMap = new Map<string, string>(
-  JSON.parse(
-    Fs.readFileSync(new URL("../../test/cdn.json", import.meta.url), "utf8"),
-  ),
-);
-
-const system = createSystem(fsMap);
+import { getEnv } from "../../test/env.js";
 
 describe("getAutocompletion", () => {
   it("null", async () => {
-    const env = createVirtualTypeScriptEnvironment(system, [], ts, {
-      lib: ["es2022"],
-    });
+    const env = getEnv();
 
     await expect(
       getAutocompletion({
@@ -34,9 +19,7 @@ describe("getAutocompletion", () => {
   });
 
   it("completion", async () => {
-    const env = createVirtualTypeScriptEnvironment(system, [], ts, {
-      lib: ["es2022"],
-    });
+    const env = getEnv();
 
     const name = "/foo.ts";
     const content = "const x = 'hi'.";

src/autocomplete/tsAutocomplete.test.ts

@@ -2,11 +2,35 @@ import { describe, it, expect } from "vitest";
 import { tsAutocomplete } from "./tsAutocomplete.js";
 import { EditorState } from "@codemirror/state";
 import { CompletionContext } from "@codemirror/autocomplete";
+import { tsFacet } from "../facet/tsFacet.js";
+import { getEnv } from "../../test/env.js";
 
 describe("tsAutocomplete", () => {
   it("null", async () => {
     const a = tsAutocomplete();
     const state = EditorState.create();
     await expect(a(new CompletionContext(state, 0, true))).resolves.toBeNull();
   });
+
+  it("getting completions successfully", async () => {
+    const a = tsAutocomplete();
+    const doc = "export const x = 10.";
+    const env = getEnv();
+
+    const path = "/foo.ts";
+    const content = "const x = 'hi'.";
+    env.createFile(path, content);
+
+    const state = EditorState.create({
+      doc,
+      extensions: [tsFacet.of({ env, path })],
+    });
+
+    const completions = await a(new CompletionContext(state, doc.length, true));
+
+    expect(completions).toMatchObject({
+      from: doc.length,
+      options: expect.any(Array),
+    });
+  });
 });

test/env.ts

@@ -0,0 +1,18 @@
+import {
+  createSystem,
+  createVirtualTypeScriptEnvironment,
+} from "@typescript/vfs";
+import ts from "typescript";
+import * as Fs from "node:fs";
+
+const fsMap = new Map<string, string>(
+  JSON.parse(Fs.readFileSync(new URL("./cdn.json", import.meta.url), "utf8")),
+);
+
+const system = createSystem(fsMap);
+
+export function getEnv() {
+  return createVirtualTypeScriptEnvironment(system, [], ts, {
+    lib: ["es2022"],
+  });
+}