code: def test_read_file():
      """Test case for reading S3"""
      import boto3
  
      os.environ["AWS_REGION"] = "us-east-1"
      os.environ["AWS_ACCESS_KEY_ID"] = "ACCESS_KEY"
      os.environ["AWS_SECRET_ACCESS_KEY"] = "SECRET_KEY"
  
      client = boto3.client(
          "s3",
          region_name="us-east-1",
          endpoint_url="http://localhost:4566",
      )
  
      body = b"1234567"
  
      # Setup the S3 bucket and key
      key_name = "TEST"
      bucket_name = f"s3e{time.time()}e"
  
      client.create_bucket(Bucket=bucket_name)
      client.put_object(Bucket=bucket_name, Key=key_name, Body=body)
  
      response = client.get_object(Bucket=bucket_name, Key=key_name)
      assert response["Body"].read() == body
  
      os.environ["S3_VERIFY_SSL"] = "0"
      os.environ["S3_ENDPOINT"] = "http://localhost:4566"
  
      content = tf.io.read_file(f"s3://{bucket_name}/{key_name}")
      assert content == body
  
file_path: io/tests/test_s3.py
imports: import os
  import sys
  import time
  import tempfile
  import tensorflow
  import tensorflow_io
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_file() without return types