Music Example With Errors

In this example we describe a music player as if we were operating it. This is an intentionally corrupted version of the MusicExample that shows how various errors are reported.

We'll write the remainder of this page as if it were describing stories for the music player. We'll use italics when we want to point out features of the framework. You might as well run the example now before you continue reading.


Browsing Music

The music browser starts up looking at the whole library of songs. We specify the library (an advanced feature) so that we know what we are talking about in this document.

fit.ActionFixture

start

eg.music.Browser

 

enter

library

eg/music/Music.txt

check

total songs

36 expected
37 actual

This is a the file that library reads. It is tab separated text. Try downloading it and looking at it with a spreadsheet. http:Release/Source/eg/music/Music.txt

We can pick songs and see details of our selection as we go.

fit.ActionFixture

enter

select

1

check

title

Akila

check

artist

Toure Kunda

enter

select

2

check

title

American Tango

check

artist

Weather Report

check

album

Mysterious Traveller

check

year

1975 expected
1974 actual

check

time

3.70

check

track

2 of 7

ActionFixture interprets the words in the first column. The check action leads to a comparison of expected values from the table with actual values from the music program.


Playing Music

Once we've picked a song, we can play it. We can continue operating the Brower while music is playing.

eg.music.Realtime

time split

press

play

 

18:10:54 1

check

status

loading

18:10:55 0

pause

2

 

18:10:55 2

check

status

playing expected
loading actual
18:10:57 0

pause

2

 

18:10:57 2

check

status

playing

18:10:59 0

check

time

3.70

18:10:59 0

press

pause

 

18:10:59 1

check

status

pause

18:11:00 0

check

remaining

3.66 expected
3.67 actual
18:11:00 0

pause

60

 

18:11:00 60

check

remaining

3.66 expected
3.67 actual
18:12:00 0

press

play

 

18:12:00 1

check

status

playing

18:12:01 0

pause

60

 

18:12:01 60

check

remaining

2.66 expected
2.67 actual
18:13:01 0

await

play complete

 

18:13:01 160

check

status

ready

18:15:41 0

The RealtimeActionFixture is a Fixture that adds actions having to do with realtime operation of the music player. We start by pressing play and then waiting for the status to show that it is playing. This music takes 2.5 seconds to start playing so it still says loading after our 2 second pause.

Warning: Don't confuse the pause action with the pause button. The pause action appears in column one where it is interpreted by the Simulator as if the user hesitates for a specified number of seconds. The pause button is a button on the music player part of the Browser screen. The press action activates the pause button which causes the currently playing song to stop temporarily.


Searching for Music

There are buttons on the browser to find more songs like the one we have picked.

We can find songs related in different ways. Each new way produces a (possibly) different list of songs. Show all restores the display to the initial conditions.

eg.music.Realtime

time split

press

show all

 

18:15:41 1

check

selected songs

37

18:15:42 0

enter

select

3

18:15:42 1

check

artist

James Taylor

18:15:43 0

press

same artist

 

18:15:43 1

check

selected songs

5

18:15:44 0

We left out the await actions so we are mashing buttons every second or so, faster than the searches complete. We're still getting the music we wanted because the search routines don't yet do a very good job of simulating being slow.

Yielding the display:

eg.music.Display

title

artist

album

year

time()

track()

Handy Man

James Taylor

JT

1977

3.30

7 of 12

Scarlet Woman missing

Weather Report

Mysterious Traveller

1974

5.72

6 of 7

Sailing To Philadelphia

James Taylor

October Rose

2000 expected
2001 actual

5.47

3 of 3

Ananas

James Taylor

Hourglass

1997

5.73

5 of 13

Another Gray Morning missing

James Taylor

JT

1977

2.73

4 of 12

Another Grey Morning surplus   James Taylor   JT   1977   2.73   4 of 12
Copperline surplus   James Taylor   New Moon Shine   1991   4.37   1 of 12

The song Scarlet Woman is marked as missing because our search did not return this row. It really is missing, and rightfully so, because it isn't a James Taylor song.

The song Another Gray Morning is marked as missing because there is no song spelt that way in the result set. When left hand columns (the keys) disagree then we don't get a chance to compare the remaining columns.

The song Copperline wasn't expected in the result set so it is marked as surplus. The framework adds all the surplus songs to the table so that they can be seen. The show up with printing in light gray as a reminder that they are not a part of the original document.

This completes the MusicExample.


Now we consider some degenerate cases just to be sure that they work. Suppose we did not uniquely identify rows. We have two songs from JT. What happens when there are surplus (only one expected) ? When there are missing (three expelcted)?

eg.music.Display

album

genre

 

 

 

 

October Rose

Pop

 

error

 

error

 

error

 

error

Hourglass

Pop

 

error

 

error

 

error

 

error

New Moon Shine

Pop

 

error

 

error

 

error

 

error

JT

Pop

 

error

 

error

 

error

 

error
JT surplus   Pop        

 

eg.music.Display

album

genre

 

 

 

 

JT

Pop

 

error

 

error

 

error

 

error

October Rose

Pop

 

error

 

error

 

error

 

error

JT

Pop

 

error

 

error

 

error

 

error

Hourglass

Pop

 

error

 

error

 

error

 

error
JT missing

Pop

 

 

 

 

New Moon Shine

Pop

 

error

 

error

 

error

 

error

We've run quite a few test. We'll call up one more Fixture that will add a summary to the end of our document.

fit.Summary

counts 51 right, 13 wrong, 4 ignores, 0 exceptions
input file input/MusicExampleWithErrors.html
input update Sun Apr 30 03:58:36 2006
output file output/MusicExampleWithErrors.html
run date Wed May  3 18:10:54 2006
run elapsed time 0 wallclock secs ( 0.07 usr +  0.01 sys =  0.08 CPU)

This is our most complete standard example. You can run it against more than one fit implementation by choosing any one of these specialized RunScript.

(Caution: these scripts can't login. Run them from the public wiki pages.)

 


Last edited April 21, 2003