E81004: arguments provided for no-parameter program

What went wrong

Commandline argument files found for a @Test program that declares no parameters. The program cannot receive arguments.

Worked examples

Compilable examples demonstrating this error and the correct fix:

• ek9 -q 953 (How do @Test programs work with command-line arguments...)

Example error

A '@Test' program 'SimpleTest()' that declares no parameters, in a directory that also holds commandline_arg_test1.txt, is this error: the arguments in that file have nowhere to go.

How to fix it

1. Add parameters to @Test program if it should accept args
2. Or remove commandline/expected files if args aren't needed
3. Or use simple expected_output.txt for tests without parameters

Common causes

• Forgot to add parameters to @Test program
• Created argument files for wrong test

Examples

Every example is compiled by the EK9 compiler: the first fails exactly as captioned, the others fix it.

Fails with E81004: arguments provided for no-parameter program - reported by the test runner, not the compiler, when ek9 -t greeting.ek9 runs in this project.

bad/greeting.ek9

#!ek9
defines module error.e81004.bad

  defines function

    greeting() as pure
      -> name as String
      <- result as String: `Hello, ${name}`

bad/dev/tests.ek9

#!ek9
defines module error.e81004.bad.tests

  references
    error.e81004.bad::greeting

  defines program

    @Test
    GreetingOnce()
      stdout <- Stdout()
      stdout.println(greeting("EK9"))

bad/dev/commandline_arg_simple.txt

EK9

bad/dev/expected_case_simple.txt

Hello, EK9

$ ek9 -t greeting.ek9
ℹ️ Found 1 test:
  1 assert (unit tests with assertions)

Executing 1 test...

❌ FAIL error.e81004.bad.tests::GreetingOnce [Assert] (nms)
    Test configuration error: program declares no parameters but 1 commandline_arg file(s) found

Summary: 0 passed, 1 failed (1 total)
Types: 1 assert
Duration: nms
ek9: tests failed (exit 11)
E81004: arguments provided for no-parameter program
  program declares no parameters but 1 commandline_arg file(s) found
  See: ek9 -h E81004

Fixed: A program that takes no arguments is checked by expected_output.txt

good/greeting.ek9

#!ek9
defines module error.e81004.good

  defines function

    greeting() as pure
      -> name as String
      <- result as String: `Hello, ${name}`

good/dev/tests.ek9

#!ek9
defines module error.e81004.good.tests

  references
    error.e81004.good::greeting

  defines program

    @Test
    GreetingOnce()
      stdout <- Stdout()
      stdout.println(greeting("EK9"))

good/dev/expected_output.txt

Hello, EK9

$ ek9 -t greeting.ek9
ℹ️ Found 1 test:
  1 blackbox (output validated against expected_output.txt)

Executing 1 test...

✅ PASS error.e81004.good.tests::GreetingOnce [BlackBox] (nms)

Summary: 1 passed, 0 failed (1 total)
Types: 1 blackbox
Duration: nms