*foobar*
*foo
bar*
_foobar_
_foo
bar_

_foo[bar](baz)_

----------------------------------------------------

[
	["italic", [
		["punctuation", "*"],
		"foobar",
		["punctuation", "*"]
	]],
	["italic", [
		["punctuation", "*"],
		"foo\r\nbar",
		["punctuation", "*"]
	]],
	["italic", [
		["punctuation", "_"],
		"foobar",
		["punctuation", "_"]
	]],
	["italic", [
		["punctuation", "_"],
		"foo\r\nbar",
		["punctuation", "_"]
	]],

	["italic", [
		["punctuation", "_"],
		"foo",
		["url", [
			"[bar](baz)"
		]],
		["punctuation", "_"]
	]]
]

----------------------------------------------------

Checks for italic. Also tests for inclusion of url.