docs/testing/yaml.md - third_party/github/project-chip/connectedhomeip - Git at Google

 # YAML tests

 YAML is a structured, human-readable data-serialization language. Much like json
 or proto, YAML refers to the structure and parser, and the schema used for any
 particular application is defined by the application.

 In Matter, we use YAML for describing tests and test steps. A YAML parser and
 runner is then used to translate the YAML instructions into actions used to
 interact with the device under test (DUT).

 The main runner we use for testing in Matter parses the YAML instructions into
 chip-tool commands.

 The schema description for the Matter test YAML is available here:
 [YAML Schema](./yaml_schema.md)

 ## Writing YAML tests

 Most YAML tests are written for certification. These follow a standard format
 that is used to display the test easily in the test harness.

 ### Placeholder for anatomy of a yaml test - need diagram

 ### Placeholder for anatomy of a test step - need diagram

 ### Common actions

 #### Sending a cluster command

 The following shows a test step sending a simple command with no arguments.

 ```
     - label: "This label gets printed"
       cluster: "On/Off"
       command: "On"
 ```

 -   label - label to print before performing the test step
 -   cluster - name of the cluster to send the command to
 -   command - name of the command to send

 This send the On command to the On/Off cluster on the DUT. For most tests, the
 nodeID of the DUT and endpoint for the cluster are defined in the top-level
 config section of the file and applied to every test step. However, these can
 also be overwritten in the individual test steps.

 The following shows how to send a command with arguments:

 ```
     - label: "This label gets printed before the test step"
       command: "MoveToColor"
       arguments:
           values:
               - name: "ColorX"
                 value: 32768
               - name: "ColorY"
                 value: 19660
               - name: "TransitionTime"
                 value: 0
               - name: "OptionsMask"
                 value: 0
               - name: "OptionsOverride"
                 value: 0
 ```

 -   label - label to print before performing the test step
 -   command - name of the command to send
 -   argument - this is a list parameter that takes either a "value" or "values"
     tag. Commands with arguments all use structured fields, which require the
     "values" tag with a list. Each of the fields is represented by a "name" and
     "value" pair

 In this command, the cluster: tag is elided. The cluster for the entire test can
 be set in the config section at the top of the test. This can be overwritten for
 individual test steps (as above).

 #### Reading and writing attributes

 Reading and writing attributes is represented in the Matter test YAML schemas as
 a special command that requires an additional "attribute" tag.

 The following YAML would appear as a test step, and shows how to read an
 attribute.

 ```
 - label: "TH reads the ClusterRevision from DUT"
   command: "readAttribute"
   attribute: "ClusterRevision"
 ```

 The following YAML would appear as a test step and shows how to write an
 attribute. Commands to write attributes always require an argument: tag.

 ```
 - label: "Write example attribute"
   command: "writeAttribute"
   attribute: "ExampleAttribute"
   arguments:
     value: 1
 ```

 #### Parsing Responses

 After sending a command or read or write attribute request, you may want to
 verify the response. This is done using the "response" tag with various
 sub-tags.

 The following shows a simple response parsing with two (somewhat redundant)
 checks.

 ```
 - label: "TH reads the ClusterRevision from DUT"
   command: "readAttribute"
   attribute: "ClusterRevision"
   response:
     value: 1
     constraints:
       minValue: 1
 ```

 The following tags can be used to parse the response

 | Example                                                                                                     | Description                                                                              |
 | :---------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------- |
 | response:<br />&emsp;value: [1, 2, 3, 4]                                                                    | must match exactly. Variables and saveAs values allowed                                  |
 | response:<br />&emsp;values:<br />&emsp;&emsp;- name: response_field<br />&emsp;&emsp;&nbsp;&nbsp; value: 1 | Must match exactly<br />Use for commands that return command responses with named fields |
 | response:<br /> &emsp; error: CONSTRAINT_ERROR                                                              | expect an error back (omit for success)<br />Variables and saveAs values will not work.  |
 | response:<br />&emsp;constraints:                                                                           | more complex checks - see [Schema](./yaml_schema.md) for a complete description          |

 #### Lists and structs

 Lists and structs can be represented as follows:

 Lists: `[1,2,3,4,5]`

 structs: `{field1:value, field2:value}`

 lists of structs:

 ```
 [

 {field1:value, field2:value, optionalfield:value},

 {field1:value, field2:value},

 ]
 ```

 Note that structs are different than command and command response fields, which
 are represented using name:, value: tags.

 #### Pseudo clusters

 Tests often require functionality that is not strictly cluster-based. Some of
 this functionality is supported in YAML using pseudo-clusters. These clusters
 accept command: tags like the DUT clusters to control the pseudo-cluster
 functionality.

 Some of the more common functionality is shown below:

 Establishing a connection to the DUT. This is the first step in nearly every
 test.

 ```
     - label: "Establish a connection to the DUT"
       cluster: "DelayCommands"
       command: "WaitForCommissionee"
       arguments:
           values:
               - name: "nodeId"
                 value: nodeId
 ```

 Wait for a user action:

 ```
     - label: "Do a simple user prompt message. Expect 'y' to pass."
       cluster: "LogCommands"
       command: "UserPrompt"
       arguments:
           values:
               - name: "message"
                 value: "Please enter 'y' for success"
               - name: "expectedValue"
                 value: "y"
 ```

 Wait for a time:

 ```
     - label: "Wait for 5S"
       cluster: "DelayCommands"
       command: "WaitForMs"
       arguments:
           values:
               - name: "ms"
                 value: 5000
 ```

 A full description of the available pseudo-clusters and their commands is
 available at [Pseudo-cluster description](./yaml_pseudocluster.md).

 #### Config variables and saveAs:

 Certain tags can use variables that are either declared in the config: section
 or saved from other steps. Variables that are declared in the config can be
 overwritten on the command line when running locally or through the config file
 in the test harness.

 To declare config variables in the config section, use a label with the desired
 name, then provide the type and defaultValue tags as sub-tags.

 ```
 config:
     nodeId: 0x12344321
     cluster: "Unit Testing"
     endpoint: 1
     myArg1:
         type: int8u
         defaultValue: 5
 ```

 Variables can also be saved from responses:

 ```
     - label: "Send Test Add Arguments Command"
       command: "TestAddArguments"
       arguments:
           values:
               - name: "arg1"
                 value: 3
               - name: "arg2"
                 value: 17
       response:
           values:
               - name: "returnValue"
                 saveAs: TestAddArgumentDefaultValue
                 value: 20
 ```

 Variables can then be used in later steps:

 ```
     - label: "Send Test Add Arguments Command"
       command: "TestAddArguments"
       arguments:
           values:
               - name: "arg1"
                 value: 3
               - name: "arg2"
                 value: 17
       response:
           values:
               - name: "returnValue"
                 value: TestAddArgumentDefaultValue
 ```

 Tags where variables can be used are noted in the
 [schema description](./yaml_schema.md).

 Config variables can be used to implement PIXIT values in tests.

 #### Gating tests and steps: PICS, TestEqualities and runIf

 The PICS tag can be used to unconditionally gate a test step on the PICS value
 in the file.

 The PICS tag can handle standard boolean operations on pics (!, ||, &&, ()).

 A PICS tag at the top level of the file can be used to gate the entire test in
 the test harness. Note that full-test gating is not currently implemented in the
 local runner or in the CI.

 Some test steps need to be gated on values from earlier in the test. In these
 cases, PICS cannot be used. Instead, the runIf: tag can be used. This tag
 requires a boolean value. To convert values to booleans, the TestEqualities
 function can be use. See
 [TestEqualities](https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/TestEqualities.yaml)
 for an example of how to use this pseudo-cluster.

 ## Running YAML tests

 YAML scripts are parsed and run using a python-based runner program that parses
 the file, then translates the tags into chip-tool commands, and sends those
 commands over a socket to chip-tool (running in interactive mode).

 ### Running locally

 #### Commissioning the DUT

 All YAML tests assume that the DUT has previously been commissioned before
 running. DUTs should be commissioned using chip-tool. Use the same KVS file when
 running the test.

 #### Running the tests

 There are several options for running tests locally. Because the YAML runner
 uses python, it is necessary to compile and install the chip python package
 before using any YAML runner script.

 ```
 ./scripts/build_python.sh -i py
 source py/bin/activate
 ```

 Compile chip-tool:

 ```
 ./scripts/build/build_examples.py --target linux-x64-chip-tool build

 ```

 NOTE: use the target appropriate to your system

 [chiptool.py](https://github.com/project-chip/connectedhomeip/blob/master/scripts/tests/yaml/chiptool.py)
 can be used to run tests against a commissioned DUT (commissioned by chip-tool).
 This will start an interactive instance of chip-tool automatically.

 ```
 ./scripts/tests/yaml/chiptool.py tests Test_TC_OO_2_1 --server_path ./out/linux-x64-chip-tool/chip-tool

 ```

 NOTE: substitute the appropriate test name and chip-tool path as appropriate.

 A list of available tests can be generated using:

 ```
 ./scripts/tests/yaml/chiptool.py list
 ```

 Config variables can be passed to chiptool.py after the script by separating
 with --

 ```
 ./scripts/tests/yaml/chiptool.py tests Test_TC_OO_2_1 --server_path ./out/linux-x64-chip-tool/chip-tool -- nodeId 0x12344321

 ```

 #### Factory resetting the DUT

 On the host machine, you can simulate a factory reset by deleting the KVS file.
 If you did not specify a location for the KVS file when starting the
 application, the KVS file will be in /tmp as chip_kvs

 ### Running in the CI

 -   YAML tests added to the certification directory get run automatically
     -   src/app/tests/suites/certification/
     -   PICS file: src/app/tests/suites/certification/ci-pics-values
 -   If you DON’T want to run a test in the CI
     -   (ex under development), add it to \_GetInDevelopmentTests in
         `scripts/tests/chiptest/__init__.py`

 Please see [CI testing](./ci_testing.md) for more information about how to set
 up examples apps, PICS and PIXIT values for use in the CI.

 ### Running in the TH

 TODO: Do we have a permanent link to the most up to date TH documentation? If
 so, add here.
	# YAML tests

	YAML is a structured, human-readable data-serialization language. Much like json
	or proto, YAML refers to the structure and parser, and the schema used for any
	particular application is defined by the application.

	In Matter, we use YAML for describing tests and test steps. A YAML parser and
	runner is then used to translate the YAML instructions into actions used to
	interact with the device under test (DUT).

	The main runner we use for testing in Matter parses the YAML instructions into
	chip-tool commands.

	The schema description for the Matter test YAML is available here:
	[YAML Schema](./yaml_schema.md)

	## Writing YAML tests

	Most YAML tests are written for certification. These follow a standard format
	that is used to display the test easily in the test harness.

	### Placeholder for anatomy of a yaml test - need diagram

	### Placeholder for anatomy of a test step - need diagram

	### Common actions

	#### Sending a cluster command

	The following shows a test step sending a simple command with no arguments.

	```
	- label: "This label gets printed"
	cluster: "On/Off"
	command: "On"
	```

	- label - label to print before performing the test step
	- cluster - name of the cluster to send the command to
	- command - name of the command to send

	This send the On command to the On/Off cluster on the DUT. For most tests, the
	nodeID of the DUT and endpoint for the cluster are defined in the top-level
	config section of the file and applied to every test step. However, these can
	also be overwritten in the individual test steps.

	The following shows how to send a command with arguments:

	```
	- label: "This label gets printed before the test step"
	command: "MoveToColor"
	arguments:
	values:
	- name: "ColorX"
	value: 32768
	- name: "ColorY"
	value: 19660
	- name: "TransitionTime"
	value: 0
	- name: "OptionsMask"
	value: 0
	- name: "OptionsOverride"
	value: 0
	```

	- label - label to print before performing the test step
	- command - name of the command to send
	- argument - this is a list parameter that takes either a "value" or "values"
	tag. Commands with arguments all use structured fields, which require the
	"values" tag with a list. Each of the fields is represented by a "name" and
	"value" pair

	In this command, the cluster: tag is elided. The cluster for the entire test can
	be set in the config section at the top of the test. This can be overwritten for
	individual test steps (as above).

	#### Reading and writing attributes

	Reading and writing attributes is represented in the Matter test YAML schemas as
	a special command that requires an additional "attribute" tag.

	The following YAML would appear as a test step, and shows how to read an
	attribute.

	```
	- label: "TH reads the ClusterRevision from DUT"
	command: "readAttribute"
	attribute: "ClusterRevision"
	```

	The following YAML would appear as a test step and shows how to write an
	attribute. Commands to write attributes always require an argument: tag.

	```
	- label: "Write example attribute"
	command: "writeAttribute"
	attribute: "ExampleAttribute"
	arguments:
	value: 1
	```

	#### Parsing Responses

	After sending a command or read or write attribute request, you may want to
	verify the response. This is done using the "response" tag with various
	sub-tags.

	The following shows a simple response parsing with two (somewhat redundant)
	checks.

	```
	- label: "TH reads the ClusterRevision from DUT"
	command: "readAttribute"
	attribute: "ClusterRevision"
	response:
	value: 1
	constraints:
	minValue: 1
	```

	The following tags can be used to parse the response

	\| Example \| Description \|
	\| :---------------------------------------------------------------------------------------------------------- \| :--------------------------------------------------------------------------------------- \|
	\| response:<br />&emsp;value: [1, 2, 3, 4] \| must match exactly. Variables and saveAs values allowed \|
	\| response:<br />&emsp;values:<br />&emsp;&emsp;- name: response_field<br />&emsp;&emsp;   value: 1 \| Must match exactly<br />Use for commands that return command responses with named fields \|
	\| response:<br /> &emsp; error: CONSTRAINT_ERROR \| expect an error back (omit for success)<br />Variables and saveAs values will not work. \|
	\| response:<br />&emsp;constraints: \| more complex checks - see [Schema](./yaml_schema.md) for a complete description \|

	#### Lists and structs

	Lists and structs can be represented as follows:

	Lists: `[1,2,3,4,5]`

	structs: `{field1:value, field2:value}`

	lists of structs:

	```
	[

	{field1:value, field2:value, optionalfield:value},

	{field1:value, field2:value},

	]
	```

	Note that structs are different than command and command response fields, which
	are represented using name:, value: tags.

	#### Pseudo clusters

	Tests often require functionality that is not strictly cluster-based. Some of
	this functionality is supported in YAML using pseudo-clusters. These clusters
	accept command: tags like the DUT clusters to control the pseudo-cluster
	functionality.

	Some of the more common functionality is shown below:

	Establishing a connection to the DUT. This is the first step in nearly every
	test.

	```
	- label: "Establish a connection to the DUT"
	cluster: "DelayCommands"
	command: "WaitForCommissionee"
	arguments:
	values:
	- name: "nodeId"
	value: nodeId
	```

	Wait for a user action:

	```
	- label: "Do a simple user prompt message. Expect 'y' to pass."
	cluster: "LogCommands"
	command: "UserPrompt"
	arguments:
	values:
	- name: "message"
	value: "Please enter 'y' for success"
	- name: "expectedValue"
	value: "y"
	```

	Wait for a time:

	```
	- label: "Wait for 5S"
	cluster: "DelayCommands"
	command: "WaitForMs"
	arguments:
	values:
	- name: "ms"
	value: 5000
	```

	A full description of the available pseudo-clusters and their commands is
	available at [Pseudo-cluster description](./yaml_pseudocluster.md).

	#### Config variables and saveAs:

	Certain tags can use variables that are either declared in the config: section
	or saved from other steps. Variables that are declared in the config can be
	overwritten on the command line when running locally or through the config file
	in the test harness.

	To declare config variables in the config section, use a label with the desired
	name, then provide the type and defaultValue tags as sub-tags.

	```
	config:
	nodeId: 0x12344321
	cluster: "Unit Testing"
	endpoint: 1
	myArg1:
	type: int8u
	defaultValue: 5
	```

	Variables can also be saved from responses:

	```
	- label: "Send Test Add Arguments Command"
	command: "TestAddArguments"
	arguments:
	values:
	- name: "arg1"
	value: 3
	- name: "arg2"
	value: 17
	response:
	values:
	- name: "returnValue"
	saveAs: TestAddArgumentDefaultValue
	value: 20
	```

	Variables can then be used in later steps:

	```
	- label: "Send Test Add Arguments Command"
	command: "TestAddArguments"
	arguments:
	values:
	- name: "arg1"
	value: 3
	- name: "arg2"
	value: 17
	response:
	values:
	- name: "returnValue"
	value: TestAddArgumentDefaultValue
	```

	Tags where variables can be used are noted in the
	[schema description](./yaml_schema.md).

	Config variables can be used to implement PIXIT values in tests.

	#### Gating tests and steps: PICS, TestEqualities and runIf

	The PICS tag can be used to unconditionally gate a test step on the PICS value
	in the file.

	The PICS tag can handle standard boolean operations on pics (!, \|\|, &&, ()).

	A PICS tag at the top level of the file can be used to gate the entire test in
	the test harness. Note that full-test gating is not currently implemented in the
	local runner or in the CI.

	Some test steps need to be gated on values from earlier in the test. In these
	cases, PICS cannot be used. Instead, the runIf: tag can be used. This tag
	requires a boolean value. To convert values to booleans, the TestEqualities
	function can be use. See
	[TestEqualities](https://github.com/project-chip/connectedhomeip/blob/master/src/app/tests/suites/TestEqualities.yaml)
	for an example of how to use this pseudo-cluster.

	## Running YAML tests

	YAML scripts are parsed and run using a python-based runner program that parses
	the file, then translates the tags into chip-tool commands, and sends those
	commands over a socket to chip-tool (running in interactive mode).

	### Running locally

	#### Commissioning the DUT

	All YAML tests assume that the DUT has previously been commissioned before
	running. DUTs should be commissioned using chip-tool. Use the same KVS file when
	running the test.

	#### Running the tests

	There are several options for running tests locally. Because the YAML runner
	uses python, it is necessary to compile and install the chip python package
	before using any YAML runner script.

	```
	./scripts/build_python.sh -i py
	source py/bin/activate
	```

	Compile chip-tool:

	```
	./scripts/build/build_examples.py --target linux-x64-chip-tool build

	```

	NOTE: use the target appropriate to your system

	[chiptool.py](https://github.com/project-chip/connectedhomeip/blob/master/scripts/tests/yaml/chiptool.py)
	can be used to run tests against a commissioned DUT (commissioned by chip-tool).
	This will start an interactive instance of chip-tool automatically.

	```
	./scripts/tests/yaml/chiptool.py tests Test_TC_OO_2_1 --server_path ./out/linux-x64-chip-tool/chip-tool

	```

	NOTE: substitute the appropriate test name and chip-tool path as appropriate.

	A list of available tests can be generated using:

	```
	./scripts/tests/yaml/chiptool.py list
	```

	Config variables can be passed to chiptool.py after the script by separating
	with --

	```
	./scripts/tests/yaml/chiptool.py tests Test_TC_OO_2_1 --server_path ./out/linux-x64-chip-tool/chip-tool -- nodeId 0x12344321

	```

	#### Factory resetting the DUT

	On the host machine, you can simulate a factory reset by deleting the KVS file.
	If you did not specify a location for the KVS file when starting the
	application, the KVS file will be in /tmp as chip_kvs

	### Running in the CI

	- YAML tests added to the certification directory get run automatically
	- src/app/tests/suites/certification/
	- PICS file: src/app/tests/suites/certification/ci-pics-values
	- If you DON’T want to run a test in the CI
	- (ex under development), add it to \_GetInDevelopmentTests in
	`scripts/tests/chiptest/__init__.py`

	Please see [CI testing](./ci_testing.md) for more information about how to set
	up examples apps, PICS and PIXIT values for use in the CI.

	### Running in the TH

	TODO: Do we have a permanent link to the most up to date TH documentation? If
	so, add here.