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Test of is_null()

Example #1 : test success
Example #2 : test success
Example #3 : test success
Example #4 : test success
Example #1
$input = '$inexistent'
$expected_output = $test_output
$test_output = [
  'result' => [
    'bool' => true,
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
Example #2
$input = NULL
$expected_output = $test_output
$test_output = [
  'result' => [
    'bool' => true,
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
Example #3
$input = 0
$expected_output = $test_output
$test_output = [
  'result' => [
    'bool' => false,
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
Example #4
$input = 'null'
$expected_output = $test_output
$test_output = [
  'result' => [
    'bool' => false,
  ],
  'php_version' => '7.1.33 Linux x86_64',
]
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