Prove.prove

You're seeing just the macro prove, go back to Prove module for more information.
Link to this macro

prove(description \\ "", expr)

View Source (macro)

A macro to write simple a simple test shorter.

Code like:

prove identity(5) == 5
prove "check:", identity(7) == 7

is equivalent to:

test "identity(5) == 5" do
  assert identity(5) == 5
end

test "check: indentity(7) == 7" do
  assert identity(7) == 7
end

prove supports the operators ==, !=, ===, !==, <, <=, >, >=, and =~.