rewrite tests for cargo compat, decoupled directory, output handling

tests/fixtures/wc/moby_dick.txt

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+Call me Ishmael. Some years ago - never mind how long
+precisely - having little or no money in my purse, and nothing
+particular to interest me on shore, I thought I would sail about a
+little and see the watery part of the world. It is a way I have of
+driving off the spleen and regulating the circulation. Whenever I
+find myself growing grim about the mouth; whenever it is a damp,
+drizzly November in my soul; whenever I find myself involuntarily
+pausing before coffin warehouses, and bringing up the rear of every
+funeral I meet; and especially whenever my hypos get such an upper
+hand of me, that it requires a strong moral principle to prevent me
+from deliberately stepping into the street, and methodically
+knocking people's hats off - then, I account it high time to get to
+sea as soon as I can.  This is my substitute for pistol and ball.
+With a philosophical flourish Cato throws himself upon his sword; I
+quietly take to the ship. There is nothing surprising in this. If
+they but knew it, almost all men in their degree, some time or
+other, cherish very nearly the same feelings towards the ocean with
+me.