keep_keys: Add complex integration tests. (#203)

* keep_keys: Add complex integration tests.

* Changelog

* fix lint

* fix lint warnings

* fix final warning

* add seprate file for vars

---------

Co-authored-by: Vinay M <63404819+roverflow@users.noreply.github.com>
Co-authored-by: roverflow <roverflow5@gmail.com>

changelogs/fragments/203.yaml

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+---
+trivial:
+  - Add integration tests for keep_keys

tests/integration/targets/utils_keep_keys/tasks/complex1.yaml

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+---
+- name: Include expected output data
+  ansible.builtin.include_vars:
+    file: complex.yaml
+
+- name: Test keep_keys
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['p1', 'p2']) }}"
+    target:
+      - { p1: a, p2: a }
+      - { p1: b, p2: b }
+      - { p1: c, p2: c }
+  tags: keep_keys
+  block:
+    - name: Test keep_keys debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test map keep_keys
+  vars:
+    result: "{{ l2 | map('ansible.utils.keep_keys', target=['p1', 'p2']) | list }}"
+    target:
+      - - { p1: a, p2: a }
+        - { p1: b, p2: b }
+        - { p1: c, p2: c }
+      - - { p1: a, p2: a }
+        - { p1: b, p2: b }
+        - { p1: c, p2: c }
+      - - { p1: a, p2: a }
+        - { p1: b, p2: b }
+        - { p1: c, p2: c }
+  tags: map_keep_keys
+  block:
+    - name: Test map keep_keys debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test map keep_keys assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test keep_keys starts_with
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['p1', 'p2'], matching_parameter='starts_with') }}"
+    target:
+      - { p1: a, p2: a }
+      - { p1: b, p2: b }
+      - { p1: c, p2: c }
+  tags: keep_keys_starts_with_2
+  block:
+    - name: Test keep_keys starts_with debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys starts_with assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test keep_keys starts_with 'p'
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['p'], matching_parameter='starts_with') }}"
+    target:
+      - { p1: a, p2: a, p3: a }
+      - { p1: b, p2: b, p3: b }
+      - { p1: c, p2: c, p3: c }
+  tags: keep_keys_starts_with_1
+  block:
+    - name: Test keep_keys starts_with 'p' debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys starts_with 'p' assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test keep_keys ends_with
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['p1', 'p2'], matching_parameter='ends_with') }}"
+    target:
+      - { p1: a, p2: a }
+      - { p1: b, p2: b }
+      - { p1: c, p2: c }
+  tags: keep_keys_ends_with_2
+  block:
+    - name: Test keep_keys end_with debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys end_with assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test keep_keys ends_with '2'
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['2'], matching_parameter='ends_with') }}"
+    target:
+      - { p2: a }
+      - { p2: b }
+      - { p2: c }
+  tags: keep_keys_ends_with_1
+  block:
+    - name: Test keep_keys end_with '2' debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys end_with '2' assert
+      ansible.builtin.assert:
+        that: result == target
+
+- name: Test keep_keys regex
+  vars:
+    result: "{{ l1 | ansible.utils.keep_keys(target=['p1', 'p2'], matching_parameter='regex') }}"
+    target:
+      - { p1: a, p2: a }
+      - { p1: b, p2: b }
+      - { p1: c, p2: c }
+  tags: keep_keys_regex
+  block:
+    - name: Test keep_keys regex debug
+      ansible.builtin.debug:
+        var: result|to_yaml
+      when: debug_test|d(false)|bool
+    - name: Test keep_keys regex assert
+      ansible.builtin.assert:
+        that: result == target

tests/integration/targets/utils_keep_keys/vars/complex.yaml

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+---
+l1:
+  - { p1: a, p2: a, p3: a }
+  - { p1: b, p2: b, p3: b }
+  - { p1: c, p2: c, p3: c }
+l2:
+  - - { p1: a, p2: a, p3: a }
+    - { p1: b, p2: b, p3: b }
+    - { p1: c, p2: c, p3: c }
+  - - { p1: a, p2: a, p3: a }
+    - { p1: b, p2: b, p3: b }
+    - { p1: c, p2: c, p3: c }
+  - - { p1: a, p2: a, p3: a }
+    - { p1: b, p2: b, p3: b }
+    - { p1: c, p2: c, p3: c }
+l3:
+  - { p1_key_o1: a, p2_key_o2: a, p3_key_o3: a }
+  - { p1_key_o4: b, p2_key_o5: b, p3_key_o6: b }
+  - { p1_key_o7: c, p2_key_o8: c, p3_key_o9: c }