fuzz: fixed fuzz test matrix

.github/workflows/fuzz-test.yml

@@ -41,7 +41,10 @@ jobs:
             jq  '.|select(.Action == "output")|select( (.Output|test("^(ok)|(\\?)"))|not )|{package: .Package, test: (.Output|gsub("\n";""))}'|\
             jq --slurp \
           )
-          echo "matrix=${fuzz_test}" >> "${GITHUB_OUTPUT}"
+          export fuzz_tests
+          echo "matrix<<EOF" >> "${GITHUB_OUTPUT}"
+          printenv fuzz_tests >> "${GITHUB_OUTPUT}"
+          echo "EOF" >> "${GITHUB_OUTPUT}"
           echo "::notice title=Fuzz tests found:${fuzz_tests}"
 
   fuzz-test:

sample/sample.go

@@ -4,3 +4,11 @@ package sample
 func Sample() int {
 	return 1
 }
+
+func fuzzable(input []byte) string {
+	if len(input) > 0 {
+		return string(input)
+	}
+
+	return "0"
+}

sample/sample_test.go

@@ -17,3 +17,15 @@ func TestSample(t *testing.T) {
 	*/
 	require.Equal(t, 1, Sample())
 }
+
+func FuzzSample(f *testing.F) {
+	f.Add([]byte(nil))
+	f.Add([]byte{})
+	f.Add([]byte{'x'})
+
+	f.Fuzz(func(t *testing.T, input []byte) {
+		require.NotPanics(t, func() {
+			_ = fuzzable(input)
+		})
+	})
+}