New with this version:
- “eventually” method for async polling assertions
- “d” takes an optional message
Full docs in the README at GitHub - sconover/wrong: Wrong provides a general assert method that takes a predicate block. Assertion failure messages are rich in detail.
Wrong provides a simple assert method that takes a block, and
understands
the code inside it, providing verbose failure messages for free.
require “wrong”
include Wrong
assert { 1 == 1 }
#=> nil
assert { 2 == 1 }
#=> Expected (2 == 1), but 2 is not equal to 1
There are also some helper methods:
“rescuing” for catching exceptions:
assert{ rescuing{raise “vanilla”}.message == “chocolate” }
“capturing” for stdout/stderr:
assert { capturing { puts “hi” } == “hi\n” }
assert { capturing(:stderr) { $stderr.puts “hi” } == “hi\n” }
“d” for debugging:
x = 7
d { x } # => prints “x is 7” to the console
d { x * 2 } # => prints “(x * 2) is 14” to the console
d(“math is hard”) { 2 + 2 } #=> prints “math is hard: (2 + 2) is 4”
“close_to?” for floating point comparison
assert { 5.0.close_to?(5.0001) } # default tolerance = 0.001
assert { 5.0.close_to?(5.1, 0.5) } # optional tolerance parameter
“eventually” for async polling:
eventually { night? }
calls night? N times a second, returning the first time it’s true(ish),
or raising an error after M seconds
(default N=4 and M=5)
–
Alex C. - [email protected] - http://alexch.github.com
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