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test: cover P0 variadic calls and match rest patterns #25

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9908a7e
test: cover P0 call binding and pattern rest cases
siyul-park Jul 3, 2026
c1c2986
ci: run Go tests on pushes and pull requests
siyul-park Jul 3, 2026
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37 changes: 37 additions & 0 deletions .github/workflows/test.yml
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Original file line number Diff line number Diff line change
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name: Test

on:
push:
branches:
- main
pull_request:
branches:
- main

permissions:
contents: read

concurrency:
group: test-${{ github.workflow }}-${{ github.ref }}
cancel-in-progress: true

jobs:
go-test:
name: Go test
runs-on: ubuntu-latest

steps:
- name: Checkout
uses: actions/checkout@v4

- name: Set up Go
uses: actions/setup-go@v5
with:
go-version-file: go.mod
cache: true

- name: Download dependencies
run: go mod download

- name: Run tests
run: go test ./...
45 changes: 45 additions & 0 deletions compiler/p0_regression_test.go
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package compiler

import (
"testing"

"github.com/stretchr/testify/require"
)

func TestP0VariadicAndCallUnpackingRegression(t *testing.T) {
t.Run("static tuple star call and keyword-only argument", func(t *testing.T) {
src := "def total(a: int, b: int, *, c: int = 3) -> int:\n" +
" return a + b + c\n" +
"args: tuple[int, int] = (1, 2)\n" +
"print(str(total(*args)))\n" +
"print(str(total(*args, c=4)))\n"
require.Equal(t, "6\n7\n", run(t, src))
})

t.Run("duplicate keyword from positional binding is rejected", func(t *testing.T) {
errs := checkOnly(t, "def f(a: int) -> int:\n"+
" return a\n"+
"print(str(f(1, a=2)))\n")
require.NotEmpty(t, errs)
})
}

func TestP0MatchStarAndRestPatternsRegression(t *testing.T) {
t.Run("list starred rest capture", func(t *testing.T) {
src := "xs: list[int] = [1, 2, 3]\n" +
"match xs:\n" +
" case [head, *tail]:\n" +
" print(str(head))\n" +
" print(str(tail[0]))\n"
require.Equal(t, "1\n2\n", run(t, src))
})

t.Run("mapping rest capture copies unconsumed keys", func(t *testing.T) {
src := "data: dict[str, int] = {\"x\": 1, \"y\": 2}\n" +
"match data:\n" +
" case {\"x\": x, **rest}:\n" +
" print(str(x))\n" +
" print(str(rest[\"y\"]))\n"
require.Equal(t, "1\n2\n", run(t, src))
})
}
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