test(fuzz): add testdata

[ernado]

Updates #10

[ernado]

@tdakkota please fix it so I can fuzz it further.

Currently I'm unable to proceed because go std fuzzing does not support multiple crashers.

[codecov]

Codecov Report

Merging #19 (55e8d71) into main (28a3a82) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   76.23%   76.33%   +0.09%     
==========================================
  Files          21       21              
  Lines        7154     7154              
==========================================
+ Hits         5454     5461       +7     
+ Misses       1326     1321       -5     
+ Partials      374      372       -2     

Impacted Files	Coverage Δ
parserc.go	87.41% <0.00%> (+0.44%)	⬆️
sorter.go	86.81% <0.00%> (+3.29%)	⬆️

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[tdakkota]

@ernado I've rebased this branch and moved the tag check under the env flag. Now it is possible to continue fuzzing.

[ernado]

--- FAIL: FuzzDecodeEncodeDecode (6.59s)
    --- FAIL: FuzzDecodeEncodeDecode (0.00s)
        fuzz_test.go:118:
                Error Trace:    /root/yamlx/fuzz_test.go:118
                                                        /root/yamlx/fuzz_test.go:133

                                                        /root/yamlx/value.go:339
                                                        /root/yamlx/fuzz.go:337
                Error:          Not equal:
                                expected: "\n"
                                actual  : "\n\n"

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -2 +2,2 @@

                                +
                Test:           FuzzDecodeEncodeDecode
        fuzz_test.go:87: Input: "|+\n\n#00000"
        fuzz_test.go:89: Data: "|4+\n\n\n#00000\n"

    Failing input written to testdata/fuzz/FuzzDecodeEncodeDecode/8cf4812e4e6f6f8c0276e10a83403ad06a31dd9d59a344b969bdc7a50e5822d2
    To re-run:
    go test -run=FuzzDecodeEncodeDecode/8cf4812e4e6f6f8c0276e10a83403ad06a31dd9d59a344b969bdc7a50e5822d2

Probably should normalize newlines

[ernado]

@tdakkota

go test fuzz v1
[]byte("&x\nc: *x")

Fuzzing hangs up on this, please check. Probably infinite recursion?

[ernado]

fuzz: elapsed: 42s, execs: 4084712 (61455/sec), new interesting: 362 (total: 1425)
--- FAIL: FuzzDecodeEncodeDecode (41.95s)
    --- FAIL: FuzzDecodeEncodeDecode (0.00s)
        fuzz_test.go:115:
                Error Trace:    /root/yamlx/fuzz_test.go:115
                                                        /root/yamlx/value.go:556
                                                        /root/yamlx/value.go:339
                                                        /root/yamlx/fuzz.go:337
                Error:          Received unexpected error:
                                yaml: offset 2: did not find expected tag URI
                Test:           FuzzDecodeEncodeDecode
        fuzz_test.go:91: Input: "!<!!>"
        fuzz_test.go:93: Data: "!!\n"

    Failing input written to testdata/fuzz/FuzzDecodeEncodeDecode/daa3fb5eb85b769d93c89ebec33f7aed8714a9ff0929acaef0738972aaba2934
    To re-run:
    go test -run=FuzzDecodeEncodeDecode/daa3fb5eb85b769d93c89ebec33f7aed8714a9ff0929acaef0738972aaba2934

go test fuzz v1
[]byte("!<!!>")

[ernado]

--- FAIL: FuzzDecodeEncodeDecode (6.28s)
    --- FAIL: FuzzDecodeEncodeDecode (0.00s)
        fuzz_test.go:115:
                Error Trace:    /root/yamlx/fuzz_test.go:115
                                                        /root/yamlx/value.go:556
                                                        /root/yamlx/value.go:339
                                                        /root/yamlx/fuzz.go:337
                Error:          Received unexpected error:
                                yaml: offset 1: did not find expected whitespace or line break
                Test:           FuzzDecodeEncodeDecode
        fuzz_test.go:91: Input: "%TAG ! !,\n--- !0"
        fuzz_test.go:93: Data: "!,0\n"

    Failing input written to testdata/fuzz/FuzzDecodeEncodeDecode/80d7746f8ea58302875df00e90705f229103358f698aeb73f512a7cdf2e3ca6f
    To re-run:
    go test -run=FuzzDecodeEncodeDecode/80d7746f8ea58302875df00e90705f229103358f698aeb73f512a7cdf2e3ca6f
FAIL
exit status 1
FAIL    github.com/go-faster/yamlx      13.103s

go test fuzz v1
[]byte("%TAG ! !,\n--- !0")