Add How to test your declarations

Author: Ndpnt

content/terms/how-to/test-declaration.md

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+---
+title: "Test your declarations"
+weight: 4
+---
+
+# Test your declarations
+
+When creating or modifying service declarations, it's important to verify they work as expected. Let's see how to test your declarations in different ways.
+
+## Full testing
+
+To test your declarations by actually fetching the documents and validating the entire process:
+
+```sh
+npx ota validate declarations
+```
+
+It is also possible to test a single service declaration:
+
+```sh
+npx ota validate declarations --services "<service-name>"
+```
+
+Even a single terms of a service can be tested:
+
+```sh
+npx ota validate declarations --services "<service-name>" --terms "<terms-type>"
+```
+
+## Schema validation only
+
+For quicker validation that only checks the declaration structure without fetching any documents:
+
+```sh
+npx ota validate declarations --schema-only
+```
+
+This is useful during initial development to ensure your JSON structure is correct before testing the actual document fetching.
+
+Same options as for the full test are available.
+
+## Linting declarations
+
+To ensure consistency across all declarations, you should also run the linter:
+
+```sh
+npx ota lint
+```
+
+Same options as for the full test are available.
+
+To automatically fix linting errors:
+
+```sh
+npx ota lint --fix
+```
+
+This will format your declaration files according to the project's standards.