First version of regression tests.

Only one test so far but the framework for more is in place.

tests/Makefile

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+# Test-suite makefile for reposurgeon
+
+# By setting the REPOSURGEON environment variable and using -e
+# a different implementation can be plugged in to the tests.
+
+# Use absolute path so tests that change working directory still use 
+# scripts from parent directory.  Note that using $PWD seems to fail
+# here under Gitlab's CI environment.
+PATH := $(realpath ..):$(realpath .):${PATH}
+
+# Defeat annoying behavior under Mac OS X - builtin echo doesn't do -n
+ECHO := /bin/echo
+
+default:
+	make -e --quiet all
+
+all: listcheck regress
+	@echo "=== No diff output is good news."
+
+.SUFFIXES: .chk
+
+clean:
+	rm -fr *~
+
+# Show summary lines for all tests.
+testlist:
+	@grep --text '^##' *.log
+listcheck:
+	@for f in *.log; do \
+	    if ( head -3 $$f | grep --text -q '^ *##' ); then :; else echo "$$f needs a description"; fi; \
+	done
+
+# General regression testing of commands and output; look at the *.log and
+# corresponding *.chk files to see which tests this runs.
+TESTLOADS := $(shell ls -1 *.log | sed '/.log/s///')
+buildregress:
+	@for file in $(TESTLOADS); do \
+	    echo "Remaking $${file}.chk"; \
+	    $(REPOSURGEON) advent <$${file}.log >$${file}.chk \
+		2>&1 || exit 1; \
+	done
+regress:
+	@for file in $(TESTLOADS); do \
+	    $(ECHO) -n "  $${file} "; grep --text '##' $${file}.log  || echo ' ## (no description)'; \
+	    if advent $${file}.log >/tmp/regress$$$$ 2>&1; \
+	    then diff --text -u $${file}.chk /tmp/regress$$$$ || exit 1; \
+	    else echo "*** Nonzero return status on $${file}!"; exit 1; fi \
+	done
+	@rm -f /tmp/regress$$$$
+
+# end

tests/dwarf.chk

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+Couldn't find adventure.data, using adventure.text...
+Can't read adventure.text!

tests/dwarf.log

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+## Dwarf appears in soutth side chamber, where the coins are.
+n
+seed 1495763690
+seed 1495752222
+in
+take keys
+take lamp
+out
+down
+s
+s
+open grate
+down
+west
+take cage
+west
+light lamp
+take rod
+xyzzy
+xyzzy
+west
+drop rod
+west
+take bird
+east
+take rod
+west
+west
+down
+south
+take gold
+n
+n
+drop bird
+west
+take coins
+e
+s
+take jewelry
+n
+n
+take silver
+drop cage
+take silver
+n
+plugh
+inven
+drop jewelry
+drop gold
+drop silver
+inven
+drop keys
+plugh
+take knife
+throw axe
+s
+s
+up
+w
+wave rod
+w
+take diamonds