design_patterns_in_ruby_code/example.rb at master · russolsen/design_patterns_in_ruby_code · GitHub

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require'stringio'
require'pp'

defrun_fragment(code,file=__FILE__)
out_io= $stdout =StringIO.new
result=''
begin
result=eval(code,binding,file)
ensure
 $stdout =STDOUT
end
[result,out_io.string]
end

defexample(code,file=__FILE__)
run_example(0,code,file)
end

defexample_trunc(code)
run_example(5,code)
end

defexample_expected(expected_value,code)
result,output=run_fragment(code)
raise'unexpected value'unlessresult == expected_value
putscode
end

defexample_true(code)
result,output=run_fragment(code)
raise'unexpected value'unlessresult
putscode
end

defexample_false(code)
result,output=run_fragment(code)
raise'unexpected value'ifresult
putscode
end

defrun_example(max_output_lines,code,file=__FILE__)
result,output=run_fragment(code,file)
print_output(code,max_output_lines,output)
[result,output]
end

defprint_output(code,max_output_lines,output)
puts"==========================="
putscode
puts
puts"==="
puts
ifmax_output_lines <= 0
putsoutput
else
count=0
output.each_linedo |line|
putsline
count += 1
breakifcount >= max_output_lines
end
puts("...")
end
puts
end

defassert(fact,mesg='assertion failed')
raisemesgunlessfact
end

defassert_false(fact,mesg='assertion failed')
raisemesgiffact
end

defexpect_error(code)
output=''
result=''
begin
result,output=run_fragment(code)
rescueException=>e
output += "\n"
output += e.to_s
print_output(code,0,output)
else
print_output(code,0,output)
raise"*** No exception raised ***"
end
end