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| >Debugging A Test Case</H1 |
| ><P |
| >These are the kinds of debugging information available |
| from DejaGnu:</P |
| ><P |
| ></P |
| ><UL |
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| STYLE="list-style-type: disc" |
| ><P |
| >Output controlled by test scripts themselves, |
| explicitly allowed for by the test author. This kind of |
| debugging output appears in the detailed output recorded in the |
| DejaGnu log file. To do the same for new tests, use the |
| <B |
| CLASS="COMMAND" |
| >verbose</B |
| > procedure (which in turn uses the |
| variable also called <I |
| CLASS="EMPHASIS" |
| >verbose</I |
| >) to control |
| how much output to generate. This will make it easier for other |
| people running the test to debug it if necessary. Whenever |
| possible, if <I |
| CLASS="EMPHASIS" |
| >$verbose</I |
| > is |
| <I |
| CLASS="EMPHASIS" |
| >0</I |
| >, there should be no output other than the |
| output from <I |
| CLASS="EMPHASIS" |
| >pass</I |
| >, |
| <I |
| CLASS="EMPHASIS" |
| >fail</I |
| >, <I |
| CLASS="EMPHASIS" |
| >error</I |
| >, and |
| <I |
| CLASS="EMPHASIS" |
| >warning</I |
| >. Then, to whatever extent is |
| appropriate for the particular test, allow successively higher |
| values of <I |
| CLASS="EMPHASIS" |
| >$verbose</I |
| > to generate more |
| information. Be kind to other programmers who use your tests: |
| provide for a lot of debugging information.</P |
| ></LI |
| ><LI |
| STYLE="list-style-type: disc" |
| ><P |
| >Output from the internal debugging functions of |
| Tcl and <SPAN |
| CLASS="PRODUCTNAME" |
| >Expect</SPAN |
| >. There is a command |
| line options for each; both forms of debugging output are |
| recorded in the file <TT |
| CLASS="FILENAME" |
| >dbg.log</TT |
| > in the current |
| directory.</P |
| ><P |
| >Use <TT |
| CLASS="OPTION" |
| >--debug</TT |
| > for information from the |
| expect level; it generates displays of the expect attempts to |
| match the tool output with the patterns specified. This output |
| can be very helpful while developing test scripts, since it |
| shows precisely the characters received. Iterating between the |
| latest attempt at a new test script and the corresponding |
| <TT |
| CLASS="FILENAME" |
| >dbg.log</TT |
| > can allow you to create the final |
| patterns by ``cut and paste''. This is sometimes the best way |
| to write a test case.</P |
| ></LI |
| ><LI |
| STYLE="list-style-type: disc" |
| ><P |
| >Use <TT |
| CLASS="OPTION" |
| >--strace</TT |
| > to see more |
| detail at the Tcl level; this shows how Tcl procedure |
| definitions expand, as they execute. The associated number |
| controls the depth of definitions expanded.</P |
| ></LI |
| ><LI |
| STYLE="list-style-type: disc" |
| ><P |
| >Finally, if the value of |
| <I |
| CLASS="EMPHASIS" |
| >verbose</I |
| > is 3 or greater,DejaGnu turns on |
| the expect command <B |
| CLASS="COMMAND" |
| >log_user</B |
| >. This command |
| prints all expect actions to the expect standard output, to the |
| detailed log file, and (if <TT |
| CLASS="OPTION" |
| >--debug</TT |
| > is on) to |
| <TT |
| CLASS="FILENAME" |
| >dbg.log</TT |
| >.</P |
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