module Coverage

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

Usage

  1. require “coverage”

  2. do Coverage.start

  3. require or load Ruby source file

  4. 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]}

Public Class Methods

peek_result → hash click to toggle source

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

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;
}
result → hash click to toggle source

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

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;
}
start → nil click to toggle source

Enables coverage measurement.

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;
}