nimforum mirror - simple unit test library

PV (orginal) [2014-12-05T04:44:44+01:00] view original

With help from several knowledgeable people I managed to write a very small unit test library, something roughly similar to D's unittest feature. It works for me (TM) with Nim 0.10.0 on Win64 and Mingw64 4.9.1.

The code (updated version: w/o warnings, some work done doing compile time, code duplication removed):


 #  ---- simple_unit_test.nim ---
import os, times

# Minimalistic unit test library.test
# In public domain.
#
# Possible improvements:
#  * extract the source modification time only once per each file (if it is faster)
#  * modify system.assert to find out it failed inside an unit test,
#    if so then inform the user and print out unit test name
#  * ensure it can be used when compiled as windows application (not console)

template TEST*(body : stmt) =
  {.push warning[user]: off}
  when defined (unit_tests):
    body
  when defined (recent_unit_tests):
    const src_file_name = instantiation_info(-1, true).filename
    const modification_time = int(get_last_modification_time(src_file_name))
    const now = int(get_time())
    if now - modification_time < 30 * 60: # test files modified during last 30 minutes
      body
  {.pop.}

template TEST*(name : string, body : stmt) = TEST(body)

# EOF

and can be used like this:


# --- b.nim ---
import simple_unit_test

proc a_func =  echo "a_func"

TEST:
  a_func()

# --- a.nim ---
import b
import simple_unit_test

proc foo = echo "foo"

TEST:
  foo()

TEST "some name" :
  foo()

proc bar = echo "bar"

TEST:
  bar()

TEST "some name2":
  bar()

proc will_crash =
  echo "will_crash"
  assert(false)

# uncomment to see how failed test looks like
#TEST:
#  will_crash()

# EOF

Compilation options:


nim c a.nim  # no unit tests

nim c -d:unit_tests a.nim # all unit tests are compiled and run

nim c -d:recent_unit_tests a.nim # runs tests from sources modified within last 1/2 h

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