ci: check missing env variables within jest tests

src/noMissingVariablesInEnvFiles.native.test.ts

@@ -0,0 +1,56 @@
+import fs from 'fs'
+
+function loadEnvVariables(filePath: string) {
+  if (!fs.existsSync(filePath)) {
+    throw new Error(`File not found: ${filePath}`)
+  }
+  const content = fs.readFileSync(filePath, 'utf-8')
+  const lines = content.split('\n')
+
+  const envVars: string[] = []
+  lines.forEach((line) => {
+    line = line.trim()
+    if (line && !line.startsWith('#')) {
+      const [key] = line.split('=')
+      if (key) envVars.push(key.trim())
+    }
+  })
+
+  return envVars
+}
+
+function compareEnvFiles(envFiles: string[]) {
+  const envData: Record<string, string[]> = {}
+  envFiles.forEach((file) => {
+    envData[file] = loadEnvVariables(file)
+  })
+
+  const allKeys = new Set<string>()
+  for (const data of Object.values(envData)) {
+    for (const key of data) {
+      allKeys.add(key)
+    }
+  }
+
+  const missing: Record<string, string[]> = {}
+  for (const [file, data] of Object.entries(envData)) {
+    missing[file] = Array.from(allKeys).filter((x) => !data.includes(x))
+  }
+
+  return missing
+}
+
+describe('.env files', () => {
+  const envFiles = ['.env.testing', '.env.staging', '.env.integration', '.env.production']
+
+  test('all variables should be present in all .env files', () => {
+    const missingVariables = compareEnvFiles(envFiles)
+    for (const [file, variables] of Object.entries(missingVariables)) {
+      if (variables.length > 0) {
+        throw new Error(`Missing variables in ${file}: ${variables.join(', ')}`)
+      }
+    }
+
+    expect(true).toBe(true) // Pass if no error is thrown
+  })
+})