count-jest-tests-per-file.js

// Import required Node.js modules
const { exec } = require("child_process");
const { promisify } = require("util");
const fs = require("fs").promises;

// Promisify the exec function to use with async/await
const execAsync = promisify(exec);

(async () => {
    try {
        // Find all test files with a '.test.ts' extension in the 'src' directory
        const { stdout: filesStdout } = await execAsync('find ./src -type f -iname "*.test.ts"');
        const files = filesStdout.trim().split("\n");
        let totalTests = 0;

        // Iterate through each test file
        for (const file of files) {
            // Read the content of the test file
            const fileContent = await fs.readFile(file, "utf-8");

            // Count 'it', 'test', and 'it.each' function calls
            const testCalls = (fileContent.match(/\s*(test|it|it\.each)\s*\(/g) || []).length;

            // Count test cases within each 'it.each' block
            const testCasesInEach = (fileContent.match(/it\.each[^`]*`[^`]*`/g) || []).length;

            // Calculate the total test count for the current file
            const testCount = testCalls + testCasesInEach;

            // Update the total test count for the project
            totalTests += testCount;

            // Output the test count for the current file
            console.log(`File: ${file} - Test cases: ${testCount}`);
            console.log(`Current total number of Jest tests: ${totalTests}\n`);
        }

        // Output the final total number of Jest tests
        console.log(`\nFinal total number of Jest tests: ${totalTests}`);
    } catch (err) {
        // Output any errors that occurred during execution
        console.error(`Error: ${err}`);
    }
})();