Refactor: fixtures in its own files.

Added readme for creating tests.
Found and fixed interesting bugs in destroy_db when there is no world.
renamed the testfile to testrunner to make it clear it is actually running the texts. Also, made testrunner more focused on the actual running of the tests.
Added debug target to test makefile.

src/test/Makefile

@@ -8,7 +8,7 @@ ASAN:=n
 UBSAN:=n
 EXTENSION:=
 TEST_ENV:=
-CFLAGS:=-Wall -Wno-char-subscripts -Wno-unused-but-set-variable 
+CFLAGS:=-Wall -Wno-char-subscripts -Wno-unused-but-set-variable -g
 CFLAGS+=-Wl,--wrap=send_to_char,--wrap=vwrite_to_output
 AGGRESSIVE_WARNINGS=n
 LIBS:=-lcrypt 
@@ -45,27 +45,31 @@ ifneq ($(CC),pgcc)
         endif
 endif
 
-MUNIT_FILES := ../munit/munit.h ../munit/munit.c
+#MUNIT_FILES := ../munit/munit.h ../munit/munit.c
 TEST_FILES := $(ls *.c)
 
 # exclude main.c to avoid having multiple entrypoints.
 OBJ_FILES_FROM_MUD_CODE != ls ../*.c | grep -v main.c | sed 's/\.c$$/.o/g' | xargs
-OBJ_FILES_FORM_MUNIT:= ../munit/munit.o
-OBJ_FILES_FROM_TESTS!= ls *.c | sed 's/\$$.c/.o/g' | xargs
+OBJ_FILES_FROM_MUNIT:= ../munit/munit.o
+OBJ_FILES_FROM_TESTS!= ls *.c | sed 's/\.c/.o/g' | xargs
 
-OBJ_FILES := $(OBJ_FILES_FROM_MUD_CODE) $(OBJ_FILES_FORM_MUNIT) $(OBJ_FILES_FROM_TESTS) $(LIBS)
+OBJ_FILES := $(OBJ_FILES_FROM_MUD_CODE) $(OBJ_FILES_FROM_MUNIT) $(OBJ_FILES_FROM_TESTS) $(LIBS)
 
-testfile: $(OBJ_FILES)
-	$(CC) $(CFLAGS) -o testfile $(OBJ_FILES)
+testrunner: $(OBJ_FILES)
+	$(CC) $(CFLAGS) -o testrunner $(OBJ_FILES)
+
+test: testrunner
+	$(TEST_ENV) ./testrunner
+
+debug: testrunner
+	$(TEST_ENV) gdb -q --args ./testrunner --no-fork
 
-test: testfile
-	$(TEST_ENV) ./testfile
 
 $%.o: %.c
 	$(CC) $< $(CFLAGS) -c -o $@ 
 
 clean:
-	rm -f *.o testfile depend
+	rm -f *.o testrunner depend
 all: test
 
 default: all