[Security Solution] Test plan for prebuilt rule customization (#204888)

## Summary

Addresses #202068

Adds test plan for rule customization features related to the milestone
3 prebuilt rule customization epic

x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/rule_customization.md

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+# Prebuilt Rule Customization Workflows
+
+This is a test plan for rule customization workflows specifically related to prebuilt rules
+
+Status: `in progress`.
+
+## Useful information
+
+### Tickets
+
+- [Test plan issue](https://github.com/elastic/kibana/issues/202068)
+- [Prebuilt rule customization](https://github.com/elastic/kibana/issues/174168) epic
+
+### Terminology
+
+- **Base version**: Prebuilt rule asset we ship in the rule package corresponding to the currently installed prebuilt rules. It represents "original" version of the rule. During prebuilt rules installation prebuilt rule assets data is copied over and becomes an installed prebuilt rule.
+
+- **Customized prebuilt rule**: An installed prebuilt rule that has been changed by the user in the way rule fields semantically differ from the base version. Also referred to as "Modified" in the UI.
+
+- **Non-customized prebuilt rule**: An installed prebuilt rule that has rule fields values matching the base version.
+
+- **Custom rule**: A rule created by the user themselves
+
+- **rule source, or ruleSource**: A field on the rule that defines the rule's categorization. Can be `internal` or `external`.
+
+- **`is_customized`**: A field within `ruleSource` that exists when rule source is set to `external`. It is a boolean value based on if the rule has been changed from its base version
+
+- **customizable rule field**: A rule field that is able to be customized on a prebuilt rule. A comprehenseive list can be found in `./shared_assets/customizable_rule_fields.md`.
+
+- **non-customizable rule field**: A rule field that is unable to be customized on a prebuilt rule. A comprehenseive list can be found in `./shared_assets/non_customizable_rule_fields.md`.
+
+- **non-semantic change**: A change to a rule field that is functionally different. We normalize certain fields so for a time-related field such as `from`, `1m` vs `60s` are treated as the same value. We also trim leading and trailing whitespace for query fields.
+
+### Assumptions
+
+- Rule package used will have all previous rule versions present (no missing base versions)
+
+## Scenarios
+
+### Editing prebuilt rules
+
+#### **Scenario: User can edit a non-customized prebuilt rule from the rule edit page**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And the rule is non-customized
+When user changes any rule field value (so it differs from the base version) in rule edit form
+Then the rule is successfully updated
+And the "Modified" badge should appear on the rule's detail page
+```
+
+#### **Scenario: User can edit a customized prebuilt rule from the rule edit page**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And it is customized
+When user changes any rule field value (so it differs from the base version) in rule edit form
+Then the rule is successfully updated
+And the "Modified" badge should appear on the rule's detail page
+```
+
+#### **Scenario: User can navigate to rule editing page from the rule details page**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And the user has navigated to its rule details page
+When a user clicks overflow button on this rule
+Then the "edit rule settings" button should be enabled
+And should bring the user to the rule edit page when clicked on
+```
+
+#### **Scenario: User can navigate to rule editing page from the rule management page**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And the user has navigated to the rule management page
+When a user clicks overflow button on this rule
+Then the "edit rule settings" button should be enabled
+And should bring the user to the rule edit page when clicked on
+```
+
+#### **Scenario: User can bulk edit prebuilt rules from rules management page**
+
+**Automation**: 7 cypress tests.
+
+```Gherkin
+Given a space with N (where N > 1) prebuilt rules installed
+And a user selects M (where M <= N) in the rules table
+When a user applies a <bulk_action_type> bulk action
+And the action is successfully applied to M selected rules
+Then rules that have been changed from their base version should have a "Modified" badge on the respective row in the rule management table
+
+Examples:
+| bulk_action_type                 |
+| Add index patterns               |
+| Delete index patterns            |
+| Add tags                         |
+| Delete tags                      |
+| Add custom highlighted fields    |
+| Delete custom highlighted fields |
+| Modify rule schedules            |
+```
+
+### Detecting rule customizations
+
+#### **Scenario: is_customized is set to true when user edits a customizable rule field**
+
+**Automation**: one integration test per field.
+
+```Gherkin
+Given a space with at least one non-customized prebuilt rule installed
+When a user changes the <field_name> field so it differs from the base version
+Then the rule's `is_customized` value should be true
+And ruleSource should be "external"
+
+Examples:
+<field_name> = all customizable rule fields
+```
+
+#### **Scenario: is_customized calculation is not affected by specific fields**
+
+**Automation**: 5 integration tests.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And it is non-customized
+When a user changes the <field_name> field so it differs from the base version
+Then the rule's `is_customized` value should remain false
+
+Examples:
+| field_name      |
+| actions         |
+| exceptions_list |
+| enabled         |
+| revision        |
+| meta            |
+```
+
+#### **Scenario: User cannot change non-customizable rule fields on prebuilt rules**
+
+**Automation**: 4 integration tests.
+
+```Gherkin
+Given a space with at least one prebuilt rule installed
+And it is non-customized
+When a user changes the <field_name> field so it differs from the base version
+Then API should throw a 500 error
+And the rule should remain unchanged
+
+Examples:
+<field_name> = all non-customizable rule fields
+```
+
+#### **Scenario: User can revert a customized prebuilt rule to its original state**
+
+**Automation**: 1 integration test.
+
+```Gherkin
+Given a space with at least one prebuilt rule
+And it is customized
+When a user changes the rule fields to match the base version
+Then the rule's `is_customized` value should be false
+```
+
+### Calculating the Modified badge in the UI
+
+#### **Scenario: Modified badge should appear on the rule details page when prebuilt rule is customized**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule
+And it is customized
+When a user navigates to that rule's detail page
+Then the rule's `is_customized` value should be true
+And the Modified badge should be present on the page
+```
+
+#### **Scenario: Modified badge should not appear on the rule details page when prebuilt rule isn't customized**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule
+And it is non-customized
+When a user navigates to that rule's detail page
+Then the rule's `is_customized` value should be false
+And the Modified badge should NOT be present on the page
+```
+
+#### **Scenario: Modified badge should not appear on a custom rule's rule details page**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one custom rule
+When a user navigates to that rule's detail page
+Then the Modified badge should NOT be present on the page
+```
+
+#### **Scenario: Modified badge should appear on the rule management table when prebuilt rule is modified**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule
+And it is customized
+When a user navigates to the rule management page
+Then the customized rule's `is_customized` value should be true
+And the Modified badge should be present in the table row
+```
+
+#### **Scenario: Modified badge should not appear on the rule management table when prebuilt rule isn't customized**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one prebuilt rule
+And it is non-customized
+When a user navigates to the rule management page
+Then the non-customized rule's `is_customized` value should be false
+And the Modified badge should NOT be present in the table row
+```
+
+#### **Scenario: Modified badge should not appear on the rule management table when row is a custom rule**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one custom rule
+When a user navigates to the rule management page
+Then the Modified badge should NOT be present in the custom rule's table row
+```
+
+#### **Scenario: Modified badge should appear on the rule updates table when prebuilt rule is customized**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one customized prebuilt rule
+And that rules have upgrades
+When a user navigates to the rule updates table
+And the Modified badge should be present in the table row
+```
+
+#### **Scenario: Modified badge should not appear on the rule updates table when prebuilt rule isn't customized**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one non-customized prebuilt rule
+And that rules have upgrades
+When a user navigates to the rule updates table
+And the Modified badge should NOT be present in the table row
+```
+
+#### **Scenario: User should be able to see only customized rules in the rule updates table**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one customized prebuilt rule
+And that rules have upgrades
+When a user navigates to the rule updates page
+And use filter to show customized rules
+Then the table should display only customized rules
+And all shown table rows should have the Modified badge present
+```
+
+#### **Scenario: User should be able to filter by non-customized rules on the rule updates table**
+
+**Automation**: 1 cypress test.
+
+```Gherkin
+Given a space with at least one customized prebuilt rule
+And that rules have upgrades
+When a user navigates to the rule updates page
+And use filter to show non-customized rules
+Then the table should display only non-customized rules
+And the all shown table rows should NOT have the Modified badge present
+```

x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/shared_assets/customizable_rule_fields.md

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+### Customizable rule fields
+
+These are fields in the detection rule schema that are able to be customized on a prebuilt rule.
+
+| field_name |
+| name |
+| description |
+| interval |
+| from |
+| to |
+| note |
+| severity |
+| tags |
+| severity_mapping |
+| risk_score |
+| risk_score_mapping |
+| references |
+| false_positives |
+| threat |
+| note |
+| setup |
+| related_integrations |
+| required_fields |
+| max_signals |
+| investigation_fields |
+| rule_name_override |
+| timestamp_override |
+| timeline_template |
+| building_block_type |
+| query |
+| language |
+| filters |
+| index |
+| data_view_id |
+| alert_suppression |
+| event_category_override |
+| timestamp_field |
+| tiebreaker_field |
+| threat_index |
+| threat_mapping |
+| threat_indicator_path |
+| threat_query |
+| threat_language |
+| threat_filters |
+| threshold |
+| machine_learning_job_id |
+| anomaly_threshold |
+| new_terms_fields |
+| history_window_start |
+| type |

x-pack/solutions/security/plugins/security_solution/docs/testing/test_plans/detection_response/prebuilt_rules/shared_assets/non_customizable_rule_fields.md

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+### Non-customizable rule fields
+
+These are fields in the detection rule schema that cannot be customized for a prebuilt rule.
+
+| version |
+| id |
+| author |
+| license |