package classes

import "testing"

// TestConvertH1 pins ConvertH1's byte rule: only h1 tag names change.
func TestConvertH1(t *testing.T) {
	cases := []struct {
		in, want string
		n        int
	}{
		{"<h1>A</h1><p>x</p>", "<h2>A</h2><p>x</p>", 1},
		{`<h1 class="x" id='y'>T</h1>`, `<h2 class="x" id='y'>T</h2>`, 1},
		{"<H1>Up</H1>", "<h2>Up</h2>", 1},
		{"<h1>a</h1>\n<h1>b</h1>", "<h2>a</h2>\n<h2>b</h2>", 2},
		{"<p>no heading &amp; text</p>", "<p>no heading &amp; text</p>", 0},
		{"<!-- <h1>c</h1> --><p>x</p>", "<!-- <h1>c</h1> --><p>x</p>", 0},
		{"<script>var s = '<h1>';</script>", "<script>var s = '<h1>';</script>", 0},
		{"<h10>x</h10><h1>y</h1>", "<h10>x</h10><h2>y</h2>", 1},
		{"# Markdown <h1>raw</h1> a < b", "# Markdown <h2>raw</h2> a < b", 1},
		{"<p>unterminated <h1>x", "<p>unterminated <h2>x", 1},
		{"text <", "text <", 0},
		{"", "", 0},
	}
	for _, c := range cases {
		got, n := ConvertH1(c.in)
		if got != c.want || n != c.n {
			t.Errorf("ConvertH1(%q) = %q, %d; want %q, %d", c.in, got, n, c.want, c.n)
		}
	}
}