Testers for TechWithTim Discord weekly challenges

You will find here my testers for weekly challenges.

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• How to use?
• New tester (Challenge 73 and newer)
  • To test solution in languages other than Python
  • Examples
  • Custom test cases
• Supported Python version
• Old tester (Challenge 72 and older)
• Some possible errors
• How to download individual challenge tester/file from GitHub?

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How to use?

New tester (Challenge 73 and newer)

Download tester file test_challenge_XX.py and file with test cases test_cases.json place them in same folder where is your file with solution.

Make sure Python has right to save to this folder.

This tester will create one file temp_solution_file.py make sure there's no such file in same folder or there's nothing important in it, cos it will be overwritten!

You can configure tester editing tester file and changing CONFIGURATION section or using command line arguments.

Run with flag -h or --help for more information how to use command line arguments.

python test_challenge_198.py --help

Change SOLUTION_SRC_FILE_NAME to your file name in CONFIGURATION section or use -s solution_file.py.

To test solution in languages other than Python

Use -c command or change OTHER_LANG_COMMAND to command to run your solution for not compiled languages or to already compiled executable for compiled languages. For multi-word command command line argument surround it in quotes "multi word command"

Examples

OTHER_LANG_COMMAND = "Cpp/c198_cpp.exe"  # relative to tester file path to compiled windows executable
OTHER_LANG_COMMAND = "/home/user/Dev/Challenge198/c198_c"  # absolute path to compiled Linux executable
OTHER_LANG_COMMAND = "c198_rust.exe"  # name of compiled file in same folder as tester
OTHER_LANG_COMMAND = "java -cp Java/ c198_java.Main"  # command to run solution in non compiled language
OTHER_LANG_COMMAND = ""  # leave empty if you want to test python solution

> python test_challenge_198.py -c "java -cp Java/ c198_java.Main"

$ python test_challenge_198.py -c Rust/c198_rust/target/release/c198_rust

If you want to see your solution length in other languages than Python change SOLUTION_FILE_NAME to your solution source code file name.

If this tester wasn't prepared by me for the challenge you want to test, you may need to adjust other configuration settings. Read the comments on each.

Custom test cases

You can use test cases from official TWT challenge tester published after testing or in same format. Tester will convert them to format described below.

If you want to use own test_cases, they must be in JSON format.

[
  [ # this list can be in separated file for inputs only 
    ["test case 1"], # multiline case ["line_1", "line_2", ... ,"line_n"] 
    ["test case 2"],
    ...
    ["test case n"]
  ],
  [ # and this for output only 
    "output 1",
    "output 2",
    ...
    "output n"
  ]
]

All values must be strings! Cast all ints, floats, etc. to string before dumping JSON!

Supported Python version

• Python 3.8+ works without modification
• Python 3.7 you need to comment out line otter="\N{otter}",
• Python 3.6 you need to comment out lines:
  • from dataclasses import dataclass
  • both lines that have @dataclass
  • comment out whole block starting with line if Config.USE_EMOJI: up to and including else: and unindent next line
• older Python version not supported

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Old tester (Challenge 72 and older)

Download tester file test_challenge_XX.py and file with test cases test_cases_ch_XX.py place them in same folder where is your file with solution.

Import your solution in line 92, and run tester file

> python test_challenge_XX.py

If you see some weird chars instead of colors in output or don't want colors switch COLOR_OUT to False in line 30

If there is more than one test_cases_ch_XXx.py file you can change import in line 28 or rename test case file removing letter after challenge number to use it.

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WARNING: My tester ignores printing in input() but official tester FAILS if you print something in input()

Don't do that:

input("What is the test number?")

Use empty input: input()

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Some possible errors

• None in "Your output": Your solution didn't print for all cases.

• None in "Input": Your solution print more times than there are cases.

  • If you see None in "Input" or "Your output" don't check failed cases until you fix problem with printing, cos "Input" and "Your output" are misaligned after first missing/extra print

• "Your Output" looks like "Expected" but tester show it's wrong. Check if you print trailing spaces.

• StopIteration: Your solution try to get more input than there is test cases

  • If you use open(0) instead of input you get StopIteration error in my tester or tester will hang waiting for EOF char not presented in input data
  • to avoid this use one of:
    • set OTHER_LANG_COMMAND = "python to_submit_ch_198.py"
    • run python test_challenge_198.py -c "python to_submit_ch_198.py"

• If you call your functions inside if __name__ == '__main__': your functions won't be called by default cos your solution is imported

  • to avoid this use one of:
    • set OTHER_LANG_COMMAND = "python to_submit_ch_198.py"
    • run python test_challenge_198.py -c "python to_submit_ch_198.py"
    • or don't use if __name__ == '__main__':

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How to download individual challenge tester/file from GitHub?

You can switch branch to branch with that challenge, then click Code and Download ZIP

Or in Releases section click Challenge XX and download source_code (...).

Or from command line:

# Linux
$ wget https://raw.githubusercontent.com/Pomroka/TWT_Challenges_Tester/master/Challenge_198/test_cases.json

# Windows 10
> curl -o test_cases.json https://raw.githubusercontent.com/Pomroka/TWT_Challenges_Tester/master/Challenge_198/test_cases.json

Or use https://downgit.github.io/#/home (ready to use link in Challenge_XX.md)