construct_expect_equal
                        Construct an 'expect_equal' expression
extract_examples        Extract examples lines from the functions in a
                        .R file of a package.
extract_examples_rd     Extract examples from a '.Rd' file as a
                        character vector.
extract_expressions     Text expression groups.
make_test_shell         Make the shell of a 'test_that' test.
test-shells             Create test shells.
text_parse_error        Does parsing of text give an error?
