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+# yanglint testing
+
+Testing yanglint is divided into two ways.
+It is either tested in interactive mode using the tcl command 'expect' or non-interactively, classically from the command line.
+For both modes, unit testing was used using the tcl package tcltest.
+
+## How to
+
+The sample commands in this chapter using `tclsh` are called in the `interactive` or `non-interactive` directories.
+
+### How to run all yanglint tests?
+
+In the build directory designated for cmake, enter:
+
+```
+ctest -R yanglint
+```
+
+### How to run all yanglint tests that are in interactive mode?
+
+In the interactive directory, run:
+
+```
+tclsh all.tcl
+```
+
+### How to run all yanglint tests that are in non-interactive mode?
+
+In the non-interactive directory, run:
+
+```
+tclsh all.tcl
+```
+
+### How to run all unit-tests from .test file?
+
+```
+tclsh clear.test
+```
+
+or alternatively:
+
+```
+tclsh all.tcl -file clear.test
+```
+
+### How to run one unit-test?
+
+```
+tclsh clear.test -match clear_ietf_yang_library
+```
+
+or alternatively:
+
+```
+tclsh all.tcl -file clear.test -match clear_ietf_yang_library
+```
+
+### How to run unit-tests for a certain yanglint command?
+
+Test names are assumed to consist of the command name:
+
+```
+tclsh all.tcl -match clear*
+```
+
+### How do I get more detailed information about 'expect' for a certain test?
+
+In the interactive directory, run:
+
+```
+tclsh clear.test -match clear_ietf_yang_library -load "exp_internal 1"
+```
+
+### How do I get more detailed dialog between 'expect' and yanglint for a certain test?
+
+In the interactive directory, run:
+
+```
+tclsh clear.test -match clear_ietf_yang_library -load "log_user 1"
+```
+
+### How do I suppress error message from tcltest?
+
+Probably only possible to do via `-verbose ""`
+
+### How can I also debug?
+
+You can write commands `interact` and `interpreter` from 'Expect' package into some test.
+However, the most useful are the `exp_internal` and `log_user`, which can also be written directly into the test.
+See also the rlwrap tool.
+You can also use other debugging methods used in tcl programming.
+
+### Are the tests between interactive mode and non-interactive mode similar?
+
+Sort of...
+- regex \n must be changed to \r\n in the tests for interactive yanglint
+
+### I would like to add a new "ly_" function.
+
+Add it to the ly.tcl file.
+If you need to call other subfunctions in it, add them to namespace ly::private.
+
+### I would like to use function other than those prefixed with "ly_".
+
+Look in the common.tcl file in the "uti" namespace,
+which contains general tcl functions that can be used in both interactive and non-interactive tests.