- result: ''
  args: []
- result: ''
  args: ['']
- result: ''
  args: ['', '']

- result: 'Hello, World!'
  args: ['Hello, World!']
- result: 'Hello, Alex!'
  args: ['Hello, ', ['%s', 'Alex'], '!']
- result: 'Hello, Alex!'
  args: ['Hello, ', ['%c', ['A']], ['%c', ['l']], ['%c', ['e']], ['%c', ['x']], '!']

- result: '%'
  args: [['%%']]
- result: '%%'
  args: [['%%'], ['%%']]
- result: '%%%'
  args: [['%%'], ['%%'], ['%%']]

- result: '%'
  args: [['%*%', 20]]

- result: '123'
  args: [['%u', 123]]
- result: '123456'
  args: [['%u', 123], ['%u', 456]]
- result: 'foo'
  args: [['%s', 'foo']]
- result: 'foobar'
  args: [['%s', 'foo'], ['%s', 'bar']]
- result: 'a'
  args: [['%c', ['a']]]
- result: 'ab'
  args: [['%c', ['a']], ['%c', ['b']]]
- result: 'abc'
  args: [['%c', ['a']], ['%c', ['b']], ['%c', ['c']]]

- result: '%123fooa'
  args: [['%%'], ['%u', 123], ['%s', 'foo'], ['%c', ['a']]]
- result: '%123afoo'
  args: [['%%'], ['%u', 123], ['%c', ['a']], ['%s', 'foo']]
- result: '%a123foo'
  args: [['%%'], ['%c', ['a']], ['%u', 123], ['%s', 'foo']]
- result: '%afoo123'
  args: [['%%'], ['%c', ['a']], ['%s', 'foo'], ['%u', 123]]
- result: '%foo123a'
  args: [['%%'], ['%s', 'foo'], ['%u', 123], ['%c', ['a']]]
- result: '%fooa123'
  args: [['%%'], ['%s', 'foo'], ['%c', ['a']], ['%u', 123]]
- result: '123%fooa'
  args: [['%u', 123], ['%%'], ['%s', 'foo'], ['%c', ['a']]]
- result: '123%afoo'
  args: [['%u', 123], ['%%'], ['%c', ['a']], ['%s', 'foo']]
- result: 'a%123foo'
  args: [['%c', ['a']], ['%%'], ['%u', 123], ['%s', 'foo']]
- result: 'a%foo123'
  args: [['%c', ['a']], ['%%'], ['%s', 'foo'], ['%u', 123]]
- result: 'foo%123a'
  args: [['%s', 'foo'], ['%%'], ['%u', 123], ['%c', ['a']]]
- result: 'foo%a123'
  args: [['%s', 'foo'], ['%%'], ['%c', ['a']], ['%u', 123]]
- result: '123foo%a'
  args: [['%u', 123], ['%s', 'foo'], ['%%'], ['%c', ['a']]]
- result: '123a%foo'
  args: [['%u', 123], ['%c', ['a']], ['%%'], ['%s', 'foo']]
- result: 'a123%foo'
  args: [['%c', ['a']], ['%u', 123], ['%%'], ['%s', 'foo']]
- result: 'afoo%123'
  args: [['%c', ['a']], ['%s', 'foo'], ['%%'], ['%u', 123]]
- result: 'foo123%a'
  args: [['%s', 'foo'], ['%u', 123], ['%%'], ['%c', ['a']]]
- result: 'fooa%123'
  args: [['%s', 'foo'], ['%c', ['a']], ['%%'], ['%u', 123]]
- result: '123fooa%'
  args: [['%u', 123], ['%s', 'foo'], ['%c', ['a']], ['%%']]
- result: '123afoo%'
  args: [['%u', 123], ['%c', ['a']], ['%s', 'foo'], ['%%']]
- result: 'a123foo%'
  args: [['%c', ['a']], ['%u', 123], ['%s', 'foo'], ['%%']]
- result: 'afoo123%'
  args: [['%c', ['a']], ['%s', 'foo'], ['%u', 123], ['%%']]
- result: 'foo123a%'
  args: [['%s', 'foo'], ['%u', 123], ['%c', ['a']], ['%%']]
- result: 'fooa123%'
  args: [['%s', 'foo'], ['%c', ['a']], ['%u', 123], ['%%']]

- result: '1.200000'
  args: [['%f', 1.2]]
  float: true
- result: '123.456789'
  args: [['%f', 123.456789]]
  float: true

- result: '0.01234568'
  args: [['%.8f',  0.0123456789012345678901234567890123456789]]
  float: true
- result: '0.012345679'
  args: [['%.9f',  0.0123456789012345678901234567890123456789]]
  float: true
# Actual precision is no more than 9
- result: '0.0123456790'
  args: [['%.10f', 0.0123456789012345678901234567890123456789]]
  float: true
- result: '0.01234567900'
  args: [['%.11f', 0.0123456789012345678901234567890123456789]]
  float: true
- result: '0.012345679000'
  args: [['%.12f', 0.0123456789012345678901234567890123456789]]
  float: true
- result: '0.012345679000000000000000000000'
  args: [['%.30f', 0.0123456789012345678901234567890123456789]]
  float: true
# Actual length is no more than 32
- result: '0.012345679000000000000000000000'
  args: [['%.31f', 0.0123456789012345678901234567890123456789]]
  float: true
- result: '0.012345679000000000000000000000'
  args: [['%.32f', 0.0123456789012345678901234567890123456789]]
  float: true
# Actual length is no more than 32
- result: '10.01234567900000000000000000000'
  args: [['%.32f', 10.0123456789012345678901234567890123456789]]
  float: true
- result: '100.0123456790000000000000000000'
  args: [['%.32f', 100.0123456789012345678901234567890123456789]]
  float: true
- result: '1000.012345679000000000000000000'
  args: [['%.32f', 1000.0123456789012345678901234567890123456789]]
  float: true