clarify testing steps

htdp-test/tests/stepper/manual-tests.txt

@@ -1,15 +1,15 @@
-open stepper, make sure it works for (+ 3 4).
+- open stepper, make sure it works for (+ 3 4).
 
-make sure that stepper button appears and disappears as necessary when
+- make sure that stepper button appears and disappears as necessary when
 language level changes.
 
-make sure that the stepper works for the #lang htdp/bsl style of language
+- make sure that the stepper works for the #lang htdp/bsl style of language
 specification.
 
-Make sure that you get a warning when you change the underlying program, and a
+- Make sure that you get a warning when you change the underlying program, and a
 warning when the program window disappears.
 
-Try stepping backward and forward through programs with correct and erroneous
+- Try stepping backward and forward through programs with correct and erroneous
 (syntax errors, runtime errors) executions, incl. jumping to end.
 
 Here's one to try:
@@ -21,15 +21,23 @@ Here's one to try:
 
 (f (list 7 7 7 7))
 
-For a syntax error, delete a close paren.
+  - For a syntax error, delete a close paren.
 
-For a runtime error, change (cons 13 '()) into 13
+  - For a runtime error, change (cons 13 '()) into 13
 
-Try programs which print snips (print-convert-test.ss)
+- Try programs which print snips (print-convert-test.ss)
 
-try programs that contain test cases; make sure that the popups behave sensibly.
+- Try programs that contain test cases; make sure that the popups behave sensibly.
 
-try big-bang program.
+e.g.
 
-try DMdA program, make sure that test cases don't show extra steps.
+
+(check-expect (f (list 4))
+              (list 4 13))
+(check-expect (f (list 4))
+              (list 7 13))
+
+- try big-bang program.
+
+- try DMdA program, make sure that test cases don't show extra steps.