Testthat 0.8

testthat 0.8 comes with a new recommended structure for storing your tests. To
better meet CRAN recommended practices, testthat now recommend that you to put
your tests in tests/testthat, instead of inst/tests (this makes it
possible for users to choose whether or not to install tests). With this
new structure, you'll need to use test_check() instead of test_packages()
in the test file (usually tests/testthat.R) that runs all testthat unit
tests.

The other big improvement to usability comes from @kforner, who contributed
code to allow the default results (i.e. those produced by SummaryReporter)
to include source references so you can see exactly where failures occured.

New reporters

• MultiReporter, which combines several reporters into one.
  (Thanks to @kforner)
• ListReporter, which captures all test results with their file,
  context, test and elapsed time. test_dir, test_file, test_package and
  test_check now use the ListReporter to invisibly return a summary of
  the tests as a data frame. (Thanks to @kforner)
• TeamCityReporter to produce output compatible with the TeamCity
  continuous integration environment. (Thanks to @windelinckx)
• SilentReporter so that testthat can test calls to test_that.
  (Thanks to @craigcitro, #83)

New expectations

• expect_null() and is_null to check if an object is NULL (#78)
• expect_named() and has_names() to check the names of a vector (#79)
• expect_more_than(), is_more_than(), expect_less_than(),
  is_less_than() to check values above or below a threshold.
  (#77, thanks to @jknowles)

Minor improvements and bug fixes

• expect_that() (and thus all expect_* functions) now invisibly return
  the expectation result, and stops if info or label arguments have
  length > 1 (thanks to @kforner)
• fixed two bugs with source_dir(): it did not look for the source scripts
  at the right place, and it did not use its chdir argument.
• When using expect_equal() to compare strings, the default output for
  failure provides a lot more information, which should hopefully help make
  finding string mismatches easier.
• SummaryReporter has a max_reports option to limit the number of detailed
  failure reports to show. (Thanks to @crowding)
• Tracebacks will now also contain information about where the functions came
  from (where that information is available).
• matches and expect_match now pass additional arguments on to grepl so
  that you can use fixed = TRUE, perl = TRUE or ignore.case = TRUE to
  control details of the match. expect_match now correctly fails to match
  NULL. (#100)
• expect_output, expect_message, expect_warning and expect_error
  also pass ... on to grepl, so that you can use fixed = TRUE,
  perl = TRUE or ignore.case = TRUE
• Removed stringr and evaluate dependencies.
• The not() function makes it possible to negate tests. For example,
  expect_that(f(), not(throws_error())) asserts that f() does not
  throw an error.
• Make dir_state less race-y. (Thanks to @craigcitro, #80)
• auto_test now pays attention to its 'reporter' argument (Thanks to @crowding, #81)
• get_reporter(), set_reporter() and with_reporter() are now
  exported (#102)