On the other extreme, Spock for Groovy actually on...

# spek

[hastebrot]

On the other extreme, Spock for Groovy actually only uses methods to organize single tests, and has blocks (given:, when:, then:) without any indentations/nesting using AST transformations. However this approach has restricted flexibility for setup and cleanup of fixtures, there are setup() and where:, but it is not as flexible as Spek's, RSpec's and Mocha's approach.