8. Test your CLI

Keep the main sources from lesson 7. Add src/test/kalm/stats/StatisticsTests.kalm:

StatisticsTests.kalm kalm

space stats

test "whitespace separates words":
    expect countWords("  a\tquiet   morning ") == 3

test "empty text contains no words":
    expect countWords("") == 0
    expect countWords("   ") == 0

test "an empty file has no lines":
    fix lines: List<Text> = []
    fix result = summarize(lines)
    expect result.lines() == 0
    expect result.words() == 0

test "blank lines still count":
    fix lines: List<Text> = ["", "a quiet", "morning"]
    fix result = summarize(lines)
    expect result.lines() == 3
    expect result.words() == 3

Terminal

kalm test

The runner reports four passed tests and zero failures. expect is always active; JVM assertion flags are unnecessary.

Check the program boundary

Run the finished CLI against an empty file, a whitespace-only file, and a missing path. It should report the right counts or a clear error. Try running without arguments, too.

Terminal

kalm check
kalm run -- notes.txt
kalm run -- missing.txt
kalm run

Keep the project tidy

Terminal

kalm format src/main/kalm
kalm format src/test/kalm

Formatting checks report differences. Add --fix to apply them. You now have a reusable counting function, a record, safe Java I/O, and native tests.