package toolingplan

import "testing"

func TestFirstMeaningfulLine(t *testing.T) {
	cases := []struct {
		in, want string
	}{
		{"", ""},
		{"\n\n\n", ""},
		{"   \n  \n", ""},
		{"# just a comment\n# another\n", ""},
		{"1.75.0\n", "1.75.0"},
		{"  1.75.0  ", "1.75.0"},
		{"# pinned toolchain\n1.75.0\nmore junk\n", "1.75.0"},
		{"\n\n  stable-x86_64-unknown-linux-gnu  \n", "stable-x86_64-unknown-linux-gnu"},
	}
	for _, tc := range cases {
		if got := firstMeaningfulLine(tc.in); got != tc.want {
			t.Errorf("firstMeaningfulLine(%q) = %q, want %q", tc.in, got, tc.want)
		}
	}
}