All JS and Python tests passing.

test/helpers.js

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+import { expect } from 'chai'
+import fs from 'node:fs/promises'
+import { execSync } from 'node:child_process'
+import { useDocument } from '@terrace/core'
+import { createFileReader } from '@terrace/core/readers/node-readline'
+
+export async function loadTestMap(path) {
+  const { next, level, head, tail, line, match } = useDocument(createFileReader(path))
+
+  const descriptions = {}
+
+  while (await next()) {
+    if (!head() || match('#schema')) continue
+    const tests = descriptions[tail()] = []
+
+    const rootLevel = level()
+    while (await next(rootLevel)) {
+      if (!match('it')) continue
+
+      const test = { it: tail(), packages: [], key: '', input: [], output: [] }
+      tests.push(test)
+
+      const testLevel = level()
+      while (await next(testLevel)) {
+        if (match('key')) test.key = tail()
+        if (match('packages')) test.packages = tail().split(' ')
+
+        const propertyLevel = level()
+        if (match('input')) {
+          // TODO: Find a way to handle newlines better.
+          if (tail()) {
+            test.input = tail()
+            continue
+          }
+
+          while (await next(propertyLevel)) test.input.push(line(propertyLevel + 1))
+          test.input = test.input.join('\n').trimEnd()
+        }
+
+        if (match('output')) {
+          while (await next(propertyLevel)) test.output.push(line(propertyLevel + 1))
+        }
+      }
+
+      test.input = test.input
+        .replaceAll('\\n', '\n')
+        .replaceAll('\\t', '\t')
+        .replaceAll('\\s', ' ')
+
+      test.output = test.output.join('\n').trimEnd()
+        .replaceAll('\\n', '\n')
+        .replaceAll('\\t', '\t')
+        .replaceAll('\\s', ' ')
+
+    }
+  }
+
+  return descriptions
+}
+
+export function defineTests(testMap) {
+  for (const [name, tests] of Object.entries(testMap)) {
+    describe(name, () => {
+      for (const test of tests) {
+        test.packages.forEach(pkg => {
+          it(`${pkg}: ${test.it}`, async () => {
+            expect(await callTest(pkg, test.key, test.input)).to.equal(test.output)
+          })
+        })
+      }
+    })
+  }
+}
+
+function callTest(pkg, name, input) {
+  return new Promise((resolve, reject) => {
+    const stdout = execSync(`npm run --silent test ${name}`, {
+      cwd: `../packages/${pkg}`,
+      input
+    })
+
+    // TODO: Find a way to clean all this trimming up. Most caused by VSCode happily trimming empty spaces off the ends of lines.
+    resolve(stdout.toString().trim())
+  })
+}