Refine test checks

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "pwa-node",
+      "request": "launch",
+      "name": "Debug Current Test File",
+      "autoAttachChildProcesses": true,
+      "skipFiles": ["<node_internals>/**", "**/node_modules/**"],
+      "program": "${workspaceRoot}/node_modules/vitest/vitest.mjs",
+      "args": ["run", "${relativeFile}"],
+      "smartStep": true,
+      "console": "integratedTerminal"
+    }
+  ]
+}

tests/sveltekit-plugin.test.ts

@@ -1,8 +1,38 @@
-import { describe, it, expect } from 'vitest'
+import { describe, it, expect, vi } from 'vitest'
 import svelteIntlPrecompile from '../sveltekit-plugin';
 
-describe('suite', () => {
-  it('serial test', async () => { 
-    expect(svelteIntlPrecompile).toBeTruthy();
-  })
-});
+vi.mock('path', () => ({
+  resolve(path) {
+    return 'fakeroot/' + path;
+  },
+  extname(filename) {
+    return filename.split('.')[1];
+  }
+}));
+
+vi.mock('fs/promises', () => ({
+  readdir() {
+    return Promise.resolve().then(() => ['en-US.json', 'en.json', 'es.json'])
+  },
+}));
+
+describe('imports', () => {
+  it('$locales returns a module with all the available locales', async () => { 
+    const plugin = svelteIntlPrecompile('locales');
+    const content = await plugin.load('$locales');
+    expect(content).toBe(singleLineString`
+    import { register } from 'svelte-intl-precompile'
+    export function registerAll() {
+    }
+    export const availableLocales = []`)
+  });
+});
+
+function singleLineString([str]: TemplateStringsArray) {
+  let lines: string[] = str.split('\n');
+  if (lines[0] === '') {
+    lines = lines.splice(1);
+  }
+  let firstLineSpaces = lines[0].search(/\S|$/);
+  return lines.map(l => l.substring(firstLineSpaces)).join('\n');
+}