Improving Assert Error for String

[fabricereix]

Here is a typical assert error in hurl.

error: Assert Failure
  --> tests/error_assert_value_error.hurl:8:0
   |
 8 | jsonpath "$.count" greaterThan 5
   |   actual:   int <2>
   |   expected: greater than int <5>
   |

This error is quite clear, but for string comparison, it might not be as clear.

For example, for multiline string, you may receive the following error

error: Assert Failure
  --> test.hurl:4:0
   |
 4 | body equals "one\ntwo\nthree"
   |   actual:   string <one
   |   to
   |   three>
   |   expected: string <one
   |   two
   |   three>
   |

It could be better to display both the actual and expected strings on one line. Converting the newline character to \n

The previous error would become:

error: Assert Failure
  --> test.hurl:4:0
   |
 4 | body equals "one\ntwo\nthree"
   |   actual:   string <one\nto\nthree>
   |   expected: string <one\ntwo\nthree>
   |

To go one step further, the different characters could be highlighted (for example in red) one\ntwo\nthree