add some experimental fuzzing tests

pkg/goatfile/parser_fuzz_test.go

@@ -0,0 +1,32 @@
+package goatfile
+
+import (
+	"testing"
+)
+
+func FuzzParseUse(f *testing.F) {
+	f.Add(" foo.goat")
+	f.Add(" foo")
+	f.Add(" foo/bar/baz.goat")
+	f.Add(" foo/bar/baz")
+	f.Fuzz(func(t *testing.T, s string) {
+		p := stringParser(s)
+		_, _ = p.parseUse()
+	})
+}
+
+func FuzzParseExecute(f *testing.F) {
+	f.Add(` foo.goat (hello="foo") return (foo as bar)`)
+	f.Add(` foo.goat (foo="foo" bar="bar") return (foo as bar)`)
+	f.Add(` foo.goat (
+	foo="foo" 
+	bar="bar"
+) return (
+	foo as bar
+	baz as fuz
+)`)
+	f.Fuzz(func(t *testing.T, s string) {
+		p := stringParser(s)
+		_, _, _ = p.parseExecute()
+	})
+}