test: added fuzz test for reference parser

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

Author: fredbi

fuzz_test.go

@@ -0,0 +1,100 @@
+// SPDX-FileCopyrightText: Copyright (c) 2015-2025 go-swagger maintainers
+// SPDX-License-Identifier: Apache-2.0
+
+package jsonreference
+
+import (
+	"iter"
+	"slices"
+	"strings"
+	"testing"
+
+	"github.com/go-openapi/testify/v2/require"
+)
+
+func FuzzParse(f *testing.F) {
+	// initial seed
+	cumulated := make([]string, 0, 100)
+	for generator := range generators() {
+		f.Add(generator)
+
+		cumulated = append(cumulated, generator)
+		f.Add(strings.Join(cumulated, ""))
+	}
+
+	ref := Ref{}
+	f.Fuzz(func(t *testing.T, input string) {
+		require.NotPanics(t, func() {
+			_ = ref.parse(input)
+		})
+	})
+}
+
+func generators() iter.Seq[string] {
+	return slices.Values([]string{
+		"",
+		"https://localhost/%F0%9F%8C%AD#/%F0%9F%8D%94",
+		"#/ok",
+		"%2",
+		"http://host/path/a/b/c#/f/a/b",
+		"http://host/path/a/b/c",
+		"http://host/path/a/b/c#",
+		"#/fragment/only",
+		"/documents/document.json",
+		"document.json",
+		"http://www.test.com/doc.json",
+		"#/a/b",
+		"http://www.test.com/doc.json",
+		"http://www.test2.com/doc.json#bla",
+		"http://a/b/c/d;p?q",
+		"g:h", "g:h",
+		"g", "http://a/b/c/g",
+		"./g", "http://a/b/c/g",
+		"g/", "http://a/b/c/g/",
+		"/g", "http://a/g",
+		"//g", "http://g",
+		"?y", "http://a/b/c/d;p?y",
+		"g?y", "http://a/b/c/g?y",
+		"#s", "http://a/b/c/d;p?q#s",
+		"g#s", "http://a/b/c/g#s",
+		"g?y#s", "http://a/b/c/g?y#s",
+		";x", "http://a/b/c/;x",
+		"g;x", "http://a/b/c/g;x",
+		"g;x?y#s", "http://a/b/c/g;x?y#s",
+		"", "http://a/b/c/d;p?q",
+		".", "http://a/b/c/",
+		"./", "http://a/b/c/",
+		"..", "http://a/b/",
+		"../", "http://a/b/",
+		"../g", "http://a/b/g",
+		"../..", "http://a/",
+		"../../", "http://a/",
+		"../../g", "http://a/g",
+		"http://tools.ietf.org/html/rfc3986#section-5.4.2",
+		"../../../g", "http://a/g",
+		"../../../../g", "http://a/g",
+		"https://localhost/🌭#/🍔",
+		"https://localhost/%F0%9F%8C%AD#/%F0%9F%8D%94",
+		"/./g", "http://a/g",
+		"/../g", "http://a/g",
+		"g.", "http://a/b/c/g.",
+		".g", "http://a/b/c/.g",
+		"g..", "http://a/b/c/g..",
+		"..g", "http://a/b/c/..g",
+		"./../g", "http://a/b/g",
+		"./g/.", "http://a/b/c/g/",
+		"g/./h", "http://a/b/c/g/h",
+		"g/../h", "http://a/b/c/h",
+		"g;x=1/./y", "http://a/b/c/g;x=1/y",
+		"g;x=1/../y", "http://a/b/c/y",
+		"g?y/./x", "http://a/b/c/g?y/./x",
+		"g?y/../x", "http://a/b/c/g?y/../x",
+		"g#s/./x", "http://a/b/c/g#s/./x",
+		"g#s/../x", "http://a/b/c/g#s/../x",
+		"http:g", "http:g", // for strict parsers
+		"http:g", "http://a/b/c/g",
+		`a`,
+		``, `/`, `/`, `/a~1b`, `/a~1b`, `/c%d`, `/e^f`, `/g|h`, `/i\j`, `/k"l`, `/ `, `/m~0n`,
+		`/foo`, `/0`,
+	})
+}