Coverage

Module

Coverage provides coverage measurement feature for Ruby. This feature is experimental, so these APIs may be changed in future.

Usage

require “coverage”
do Coverage.start
require or load Ruby source file
Coverage.result will return a hash that contains filename as key and coverage array as value. A coverage array gives, for each line, the number of line execution by the interpreter. A nil value means coverage is disabled for this line (lines like else and end).

Example

[foo.rb]
s = 0
10.times do |x|
  s += x
end

if s == 45
  p :ok
else
  p :ng
end
[EOF]

require "coverage"
Coverage.start
require "foo.rb"
p Coverage.result  #=> {"foo.rb"=>[1, 1, 10, nil, nil, 1, 1, nil, 0, nil]}

Class Methods

Coverage.peek_result => hash

ext/coverage/coverage.c View on GitHub

          
            static VALUE
rb_coverage_peek_result(VALUE klass)
{
    VALUE coverages = rb_get_coverages();
    VALUE ncoverages = rb_hash_new();
    if (!RTEST(coverages)) {
        rb_raise(rb_eRuntimeError, "coverage measurement is not enabled");
    }
    st_foreach(RHASH_TBL(coverages), coverage_peek_result_i, ncoverages);
    rb_hash_freeze(ncoverages);
    return ncoverages;
}

Returns a hash that contains filename as key and coverage array as value.

Coverage.result => hash

ext/coverage/coverage.c View on GitHub

          
            static VALUE
rb_coverage_result(VALUE klass)
{
    VALUE ncoverages = rb_coverage_peek_result(klass);
    VALUE coverages = rb_get_coverages();
    st_foreach(RHASH_TBL(coverages), coverage_clear_result_i, ncoverages);
    rb_reset_coverages();
    return ncoverages;
}

Returns a hash that contains filename as key and coverage array as value and disables coverage measurement.

Coverage.start => nil

ext/coverage/coverage.c View on GitHub

          
            static VALUE
rb_coverage_start(VALUE klass)
{
    if (!RTEST(rb_get_coverages())) {
        if (rb_coverages == Qundef) {
            rb_coverages = rb_hash_new();
            rb_obj_hide(rb_coverages);
        }
        rb_set_coverages(rb_coverages);
    }
    return Qnil;
}

Enables coverage measurement.