Erlang Programming/Debugging and Tracing

Tools

 * Debugging
 * dbg
 * debugger
 * Tracing
 * ttb
 * invision
 * et
 * Coverage
 * Cover

Coverage
Coverage shows what functions are covered by a test. Sample program: test_rotate.erl -module(test_rotate). -export([test/0]). test -> assert( left_rotate([a,b,c]), [b,c,a] ). assert(X, X) -> true. left_rotate([]) -> []; left_rotate([H|T]) -> T ++ [H]. Sample output:

33> cover:compile(test_rotate). 34> test_rotate:test. true 35> cover:analyse_to_file(test_rotate, "cover.html", [html]). Contents of cover.html shows that each clause was run once except for left_rotate([]). Each time the program is tested, the run count for each visited clause is increased by one. Cover sample output file:

File generated from test_rotate.erl by COVER 2008-04-23 at 12:49:11 *********************************************        |  -module(test_rotate). | -export([test/0]). |           |  test -> 1..|   assert( left_rotate([a,b,c]), [b,c,a] ). |       1..|  assert(X, X) -> true. |      0..|  left_rotate([]) -> []; 1..| left_rotate([H|T]) -> T ++ [H]. |