[test] Port LD-logger tests to python

[steakhal]

Simply port the BASH tests to python 3.
Also adds a few other test-cases, one of which demonstrates a current limitation.
In the XFAIL test, the logger produces an invalid json.

---

Maybe we should set pylint for the tests as well.

[csordasmarton]

I didn't find some test cases which were available previously: test_backslashes, test_vectical_tab, test_carriage_return, test_valid_json

codechecker/analyzer/tools/build-logger/test/test_logger.sh

Lines 161 to 199 in 2c49428

	function test_backslashes {
	bash -c "gcc -Wall -Wextra -DVARIABLE=\\\\\\\\\\\\\\\\built\\\\\\\\ages\\ \\\"ago\\\"\\\\\\\\ $source_file"
	assert_json \
	"-Wall -Wextra -DVARIABLE=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\built\\\\\\\\\\\\\\\\ages\\\\ \\\\\\\"ago\\\\\\\"\\\\\\\\\\\\\\\\ $source_file" \
	gcc \
	"$source_file"
	# - - \ \ b u i l t \ a g e s " a g o " \ - -
	assert_run_stdout_hexdump "2d 2d 5c 5c 62 75 69 6c 74 5c 61 67 65 73 20 22 61 67 6f 22 5c 2d 2d" ./a.out
	}
	function test_vectical_tab {
	bash -c "gcc -Wall -Wextra -DVARIABLE=\\\\\\\\ZZ\\\\x0bYYYY\\\\\\\\ $source_file"
	assert_json \
	"-Wall -Wextra -DVARIABLE=\\\\\\\\\\\\\\\\ZZ\\\\\\\\x0bYYYY\\\\\\\\\\\\\\\\ $source_file" \
	gcc \
	"$source_file"
	# --\ZZ\vYYYY\-- as hex
	# ^^ ---- vertical tab --------------vv
	# - - \ Z Z \v Y Y Y Y \ - -
	assert_run_stdout_hexdump "2d 2d 5c 5a 5a 0b 59 59 59 59 5c 2d 2d" ./a.out
	}
	function test_carriage_return {
	bash -c "gcc -Wall -Wextra -DVARIABLE=\\\\\\\\ZZ\\\\x0dYYYY\\\\\\\\ $source_file"
	assert_json \
	"-Wall -Wextra -DVARIABLE=\\\\\\\\\\\\\\\\ZZ\\\\\\\\x0dYYYY\\\\\\\\\\\\\\\\ $source_file" \
	gcc \
	"$source_file"
	# --\ZZ\rYYYY\-- as hex
	# ^^ ---- carriage return -----------vv
	# - - \ Z Z \r Y Y Y Y \ - -
	assert_run_stdout_hexdump "2d 2d 5c 5a 5a 0d 59 59 59 59 5c 2d 2d" ./a.out
	}

codechecker/analyzer/tools/build-logger/test/test_logger.sh

Lines 244 to 249 in 2c49428

	function test_valid_json {
	bash -c "gcc 2>/dev/null"
	echo -ne "[\n]" > $reference_file
	diff $reference_file $CC_LOGGER_FILE
	}

It would be good not to remove any test case with this patch.

[steakhal]

I didn't find some test cases which were available previously: test_backslashes, test_vectical_tab, test_carriage_return,

test_backslashes was renamed to test_space_backslashes

verticaltab is included in test_control_characters
And basically, the expected test output was wrong.
The right escape sequence for '\v' would have been ['\\', 'v'] instead of ['\\', '\v'].
The '\r' is similarly should have been escaped as ['\\', 'r'] instead of ['\\', '\r'].
This is also included in test_control_characters.

---

test_valid_json
It would be good not to remove any test case with this patch.

Oh yes, I re-added this test case.

[csordasmarton]

LGTM!