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Read class properties & call methods to cover more features

Property access and private methods on the `Diff` class are complex and involve encoding and decoding operations that warrant being tested. This test borrows its design from the `test_diff.py` unit test file.

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fuzzing/fuzz-targets
- fuzz_diff.py

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+30

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`‎fuzzing/fuzz-targets/fuzz_diff.py‎`

Lines changed: 30 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,6 @@`
`1`	`1`	`import sys`
`2`	`2`	`import os`
	`3`	`+import io`
`3`	`4`	`import tempfile`
`4`	`5`	`from binascii import Error as BinasciiError`
`5`	`6`
`@@ -13,13 +14,26 @@`
`13`	`14`	`from git import Repo, Diff`
`14`	`15`
`15`	`16`
	`17`	`+class BytesProcessAdapter:`
	`18`	`+ """Allows bytes to be used as process objects returned by subprocess.Popen."""`
	`19`	`+`
	`20`	`+ def __init__(self, input_string):`
	`21`	`+ self.stdout = io.BytesIO(input_string)`
	`22`	`+ self.stderr = io.BytesIO()`
	`23`	`+`
	`24`	`+ def wait(self):`
	`25`	`+ return 0`
	`26`	`+`
	`27`	`+ poll = wait`
	`28`	`+`
	`29`	`+`
`16`	`30`	`def TestOneInput(data):`
`17`	`31`	`fdp = atheris.FuzzedDataProvider(data)`
`18`	`32`
`19`	`33`	`with tempfile.TemporaryDirectory() as temp_dir:`
`20`	`34`	`repo = Repo.init(path=temp_dir)`
`21`	`35`	`try:`
`22`		`- Diff(`
	`36`	`+ diff=Diff(`
`23`	`37`	`repo,`
`24`	`38`	`a_rawpath=fdp.ConsumeBytes(fdp.ConsumeIntInRange(0, fdp.remaining_bytes())),`
`25`	`39`	`b_rawpath=fdp.ConsumeBytes(fdp.ConsumeIntInRange(0, fdp.remaining_bytes())),`
`@@ -44,6 +58,21 @@ def TestOneInput(data):`
`44`	`58`	`else:`
`45`	`59`	`raise e`
`46`	`60`
	`61`	`+ _ = diff.__str__()`
	`62`	`+ _ = diff.a_path`
	`63`	`+ _ = diff.b_path`
	`64`	`+ _ = diff.rename_from`
	`65`	`+ _ = diff.rename_to`
	`66`	`+ _ = diff.renamed_file`
	`67`	`+`
	`68`	`+ diff_index = diff._index_from_patch_format(`
	`69`	`+ repo, proc=BytesProcessAdapter(fdp.ConsumeBytes(fdp.ConsumeIntInRange(0, fdp.remaining_bytes())))`
	`70`	`+ )`
	`71`	`+`
	`72`	`+ diff._handle_diff_line(`
	`73`	`+ lines_bytes=fdp.ConsumeBytes(fdp.ConsumeIntInRange(0, fdp.remaining_bytes())), repo=repo, index=diff_index`
	`74`	`+ )`
	`75`	`+`
`47`	`76`
`48`	`77`	`def main():`
`49`	`78`	`atheris.Setup(sys.argv, TestOneInput)`

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Commit 989ae1a

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`‎fuzzing/fuzz-targets/fuzz_diff.py‎`

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