"""Unit tests for runner helpers (no LTspice needed)."""

from mcltspice.runner import _safe_copy


class TestSafeCopy:
    def test_skips_same_file(self, tmp_path):
        # Copying a file onto itself must not raise (was SameFileError in batch runs).
        f = tmp_path / "a.cir"
        f.write_text("hello")
        _safe_copy(f, f)
        assert f.read_text() == "hello"

    def test_skips_same_file_via_unnormalized_path(self, tmp_path):
        # Same file referenced through a "." segment -> resolve() equal -> skip.
        f = tmp_path / "a.cir"
        f.write_text("x")
        alias = tmp_path / "." / "a.cir"
        _safe_copy(f, alias)  # must not raise
        assert f.read_text() == "x"

    def test_copies_distinct_files(self, tmp_path):
        src = tmp_path / "a.cir"
        src.write_text("data")
        dst = tmp_path / "b.cir"
        _safe_copy(src, dst)
        assert dst.read_text() == "data"