feat: Add POC of a testing framework

.nvmrc

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+18.16.1

e2e_tests/agent_test_cases.ts

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+export const TEST_CASES: {
+    name:string,
+    expectedOutput: Record<string, unknown>,
+    startUrl: string,
+    instructions: string,
+}[] = [{
+    name: 'fetchActorName',
+    startUrl: 'https://apify.com',
+    instructions: `Go to the store page and perform a search for "AI Web Agent". Click the first result.
+    Extract the name of the Actor and save it in the output as 'actorName'.`,
+    expectedOutput: {
+        actorName: 'AI Web Agent',
+    },
+}];

e2e_tests/test.ts

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+import 'zx/globals';
+import fs from 'fs/promises';
+import { TEST_CASES } from './agent_test_cases.js';
+
+for (const c of TEST_CASES) {
+    const input = {
+        startUrl: c.startUrl,
+        instructions: c.instructions,
+        openaiApiKey: process.env.OPENAI_API_KEY,
+    };
+    await fs.writeFile('./storage/key_value_stores/default/INPUT.json', JSON.stringify(input));
+    await $`npm run start:dev`;
+    const outputRaw = await fs.readFile('./storage/key_value_stores/default/OUTPUT.json', { encoding: 'utf8' });
+    const output = JSON.parse(outputRaw);
+    Object.keys(c.expectedOutput).forEach((expectedKey) => {
+        if (!output[expectedKey]) {
+            console.log(`ERROR: ${expectedKey} does not exist in the output`);
+        } else if (c.expectedOutput[expectedKey] !== output[expectedKey]) {
+            console.log(`ERROR: Expected value for key ${expectedKey} "${c.expectedOutput[expectedKey]}" `
+                + `does not correspond to "${output[expectedKey]}" in the output.`);
+        } else {
+            console.log('OK');
+        }
+    });
+}