🧪 Added nested needs test with schema

tests/__snapshots__/test_nested.ambr

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+# serializer version: 1
+# name: test_nested[test_app0]
+  list([
+    '''
+      Need 'SPEC_002' has schema violations:
+        Severity:       violation
+        Need path:      SPEC_002 > parent_needs
+        Schema path:    spec-has-req-parent[0] > validate > network > parent_needs > contains
+        Schema message: Too few valid links of type 'parent_needs' (0 < 1) [sn_schema_violation.network_contains_too_few]
+
+    ''',
+  ])
+# ---
+# name: test_nested[test_app0].1
+  list([
+    NeedItem(core={'id': 'REQ_001', 'type': 'req', 'type_name': 'Requirement', 'type_prefix': 'R_', 'type_color': '#BFD8D2', 'type_style': 'node', 'title': 'Req lvl 1', 'status': 'open', 'tags': [], 'constraints': [], 'collapse': False, 'hide': False, 'style': None, 'layout': None, 'external_css': 'external_link', 'arch': {}, 'has_dead_links': False, 'has_forbidden_dead_links': False, 'sections': ('TEST DOCUMENT',), 'signature': None}, extras={'duration': None, 'completion': None, 'query': '', 'specific': '', 'max_amount': '', 'max_content_lines': '', 'id_prefix': '', 'user': '', 'created_at': '', 'updated_at': '', 'closed_at': '', 'service': '', 'url': '', 'avatar': '', 'params': '', 'prefix': '', 'url_postfix': ''}, links={'links': [], 'parent_needs': []}, backlinks={'links': ['TEST_001'], 'parent_needs': ['SPEC_001']}, source=NeedItemSourceDirective(docname='index', lineno=4, lineno_content=8), content=NeedsContent(doctype='.rst', content='Content before\n\n.. spec:: Spec lvl 2\n   :id: SPEC_001\n   :status: open\n\n   .. test:: Test lvl 3\n      :id: TEST_001\n      :status: open\n      :links: REQ_001\n\nContent after', pre_content=None, post_content=None, jinja_content=False, template=None, pre_template=None, post_template=None), parts={}, modifications=(), dynamic_fields={}),
+    NeedItem(core={'id': 'SPEC_001', 'type': 'spec', 'type_name': 'Specification', 'type_prefix': 'S_', 'type_color': '#FEDCD2', 'type_style': 'node', 'title': 'Spec lvl 2', 'status': 'open', 'tags': [], 'constraints': [], 'collapse': False, 'hide': False, 'style': None, 'layout': None, 'external_css': 'external_link', 'arch': {}, 'has_dead_links': False, 'has_forbidden_dead_links': False, 'sections': ('TEST DOCUMENT',), 'signature': None}, extras={'duration': None, 'completion': None, 'query': '', 'specific': '', 'max_amount': '', 'max_content_lines': '', 'id_prefix': '', 'user': '', 'created_at': '', 'updated_at': '', 'closed_at': '', 'service': '', 'url': '', 'avatar': '', 'params': '', 'prefix': '', 'url_postfix': ''}, links={'links': [], 'parent_needs': ['REQ_001']}, backlinks={'links': [], 'parent_needs': ['TEST_001']}, source=NeedItemSourceDirective(docname='index', lineno=10, lineno_content=14), content=NeedsContent(doctype='.rst', content='.. test:: Test lvl 3\n   :id: TEST_001\n   :status: open\n   :links: REQ_001', pre_content=None, post_content=None, jinja_content=False, template=None, pre_template=None, post_template=None), parts={}, modifications=(), dynamic_fields={}),
+    NeedItem(core={'id': 'TEST_001', 'type': 'test', 'type_name': 'Test Case', 'type_prefix': 'T_', 'type_color': '#DCB239', 'type_style': 'node', 'title': 'Test lvl 3', 'status': 'open', 'tags': [], 'constraints': [], 'collapse': False, 'hide': False, 'style': None, 'layout': None, 'external_css': 'external_link', 'arch': {}, 'has_dead_links': False, 'has_forbidden_dead_links': False, 'sections': ('TEST DOCUMENT',), 'signature': None}, extras={'duration': None, 'completion': None, 'query': '', 'specific': '', 'max_amount': '', 'max_content_lines': '', 'id_prefix': '', 'user': '', 'created_at': '', 'updated_at': '', 'closed_at': '', 'service': '', 'url': '', 'avatar': '', 'params': '', 'prefix': '', 'url_postfix': ''}, links={'links': ['REQ_001'], 'parent_needs': ['SPEC_001']}, backlinks={'links': [], 'parent_needs': []}, source=NeedItemSourceDirective(docname='index', lineno=14, lineno_content=19), content=NeedsContent(doctype='.rst', content='', pre_content=None, post_content=None, jinja_content=False, template=None, pre_template=None, post_template=None), parts={}, modifications=(), dynamic_fields={}),
+    NeedItem(core={'id': 'SPEC_002', 'type': 'spec', 'type_name': 'Specification', 'type_prefix': 'S_', 'type_color': '#FEDCD2', 'type_style': 'node', 'title': 'Spec lvl 1', 'status': 'open', 'tags': [], 'constraints': [], 'collapse': False, 'hide': False, 'style': None, 'layout': None, 'external_css': 'external_link', 'arch': {}, 'has_dead_links': False, 'has_forbidden_dead_links': False, 'sections': ('TEST DOCUMENT',), 'signature': None}, extras={'duration': None, 'completion': None, 'query': '', 'specific': '', 'max_amount': '', 'max_content_lines': '', 'id_prefix': '', 'user': '', 'created_at': '', 'updated_at': '', 'closed_at': '', 'service': '', 'url': '', 'avatar': '', 'params': '', 'prefix': '', 'url_postfix': ''}, links={'links': [], 'parent_needs': []}, backlinks={'links': [], 'parent_needs': []}, source=NeedItemSourceDirective(docname='index', lineno=21, lineno_content=25), content=NeedsContent(doctype='.rst', content='', pre_content=None, post_content=None, jinja_content=False, template=None, pre_template=None, post_template=None), parts={}, modifications=(), dynamic_fields={}),
+  ])
+# ---

tests/doc_test/doc_nested/conf.py

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+project = "nested needs test"
+extensions = ["sphinx_needs", "sphinxcontrib.plantuml"]
+needs_from_toml = "ubproject.toml"

tests/doc_test/doc_nested/index.rst

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+TEST DOCUMENT
+=============
+
+.. req:: Req lvl 1
+   :id: REQ_001
+   :status: open
+
+   Content before
+
+   .. spec:: Spec lvl 2
+      :id: SPEC_001
+      :status: open
+
+      .. test:: Test lvl 3
+         :id: TEST_001
+         :status: open
+         :links: REQ_001
+
+   Content after
+
+.. spec:: Spec lvl 1
+   :id: SPEC_002
+   :status: open
+
+.. needtable:: Table from sphinx-needs 'needtable' directive
+   :columns: id;title;tags;links;parent_need;parent_needs
+
+.. needflow::

tests/doc_test/doc_nested/schemas.json

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+{
+  "$defs": {
+    "type-req": {
+      "properties": {
+        "type": { "const": "req" }
+      }
+    },
+    "type-spec": {
+      "properties": {
+        "type": { "const": "spec" }
+      }
+    },
+    "type-test": {
+      "properties": {
+        "type": { "const": "test" }
+      }
+    }
+  },
+  "schemas": [
+    {
+      "id": "spec-has-req-parent",
+      "select": {
+        "$ref": "#/$defs/type-spec"
+      },
+      "validate": {
+        "network": {
+          "parent_needs": {
+            "contains": {
+              "local": {
+                "$ref": "#/$defs/type-req"
+              }
+            },
+            "minContains": 1,
+            "maxContains": 1
+          }
+        }
+      }
+    }
+  ]
+}

tests/doc_test/doc_nested/ubproject.toml

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+[needs]
+build_json = true
+schema_definitions_from_json = "schemas.json"

tests/test_nested.py

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+from __future__ import annotations
+
+import pytest
+from sphinx.testing.util import SphinxTestApp
+
+from sphinx_needs.api.need import get_needs_view
+
+
+@pytest.mark.parametrize(
+    "test_app",
+    [{"buildername": "html", "srcdir": "doc_test/doc_nested", "no_plantuml": False}],
+    indirect=True,
+)
+def test_nested(test_app: SphinxTestApp, snapshot, get_warnings_list):
+    app = test_app
+    app.build()
+    warnings = get_warnings_list(app)
+    assert warnings == snapshot
+
+    needs = list(get_needs_view(app).values())
+    assert needs == snapshot