setup fuzzing

Instructions taken from:

	https://medium.com/@dgryski/go-fuzz-github-com-arolek-ase-3c74d5a3150c

.gitignore

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+bin/
+workdir/

Makefile

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+.PHONY: test
+test:
+	go test -v -i
+	go test -v
+
+.PHONY: fuzz
+fuzz:
+	mkdir -p bin
+	go-fuzz-build -o=bin/css-fuzz.zip github.com/ericchiang/css
+	mkdir -p workdir/corpus
+	./scripts/init-fuzz-corpus
+	go-fuzz -bin=bin/css-fuzz.zip -workdir=workdir 
+
+.PHONY: clean
+clean:
+	rm -rf bin
+	rm -rf workdir

fuzz.go

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+// +build gofuzz
+
+package css
+
+func Fuzz(data []byte) int {
+	if _, err := Compile(string(data)); err != nil {
+		return 0
+	}
+	return 1
+}

scripts/init-fuzz-corpus

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+#!/bin/bash -e
+
+awk '{ print $0 > "workdir/corpus/example-"NR".css"}' < testdata/fuzz-samples.css

testdata/fuzz-samples.css

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+span > p, p
+p ~ span
+div > p
+span > p
+div div
+div *
+div .hi
+p :empty
+a.foo
+#foo
+a[id=foo]
+p:empty
+a:nth-child(odd)
+[id=foo]
+[id = 'foo']
+[id="foo"]
+[id|="hello"]
+[id^="hello"]
+[id$="hello"]
+[id*="hello"]