support/testing: new python-pydantic runtime test

While in theory, the fastapi tests finds problems with the pydantic
package, it's not obvious that this test should be run when the pydantic
package is updated.

Add a new test that just covers pydantic.

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

DEVELOPERS

@@ -2283,10 +2283,12 @@ F:	package/python-typing-inspection/
 F:	package/python-tzlocal/
 F:	package/python-waitress/
 F:	support/testing/tests/package/test_python_fastapi.py
+F:	support/testing/tests/package/test_python_pydantic.py
 F:	support/testing/tests/package/test_python_ruamel_yaml.py
 F:	support/testing/tests/package/test_python_tzlocal.py
 F:	support/testing/tests/package/test_python_waitress.py
 F:	support/testing/tests/package/sample_python_fastapi.py
+F:	support/testing/tests/package/sample_python_pydantic.py
 F:	support/testing/tests/package/sample_python_ruamel_yaml.py
 
 N:	Marek Belisko <marek.belisko@open-nandra.com>

support/testing/tests/package/sample_python_pydantic.py

@@ -0,0 +1,32 @@
+from datetime import datetime
+
+from pydantic import BaseModel, PositiveInt
+
+
+class User(BaseModel):
+    id: int
+    name: str = "John Doe"
+    signup_ts: datetime | None
+    tastes: dict[str, PositiveInt]
+
+
+external_data = {
+    "id": 123,
+    "signup_ts": "2019-06-01 12:22",
+    "tastes": {
+        "wine": 9,
+        b"cheese": 7,
+        "cabbage": "1",
+    },
+}
+
+user = User(**external_data)
+expected_user_dump = {
+    "id": 123,
+    "name": "John Doe",
+    "signup_ts": datetime(2019, 6, 1, 12, 22),
+    "tastes": {"wine": 9, "cheese": 7, "cabbage": 1},
+}
+
+assert user.id == 123
+assert user.model_dump() == expected_user_dump

support/testing/tests/package/test_python_pydantic.py

@@ -0,0 +1,27 @@
+import os
+
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3Pydantic(TestPythonPackageBase):
+    __test__ = True
+    config = """
+        BR2_arm=y
+        BR2_cortex_a9=y
+        BR2_ARM_ENABLE_NEON=y
+        BR2_ARM_ENABLE_VFP=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_PYDANTIC=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+    sample_scripts = ["tests/package/sample_python_pydantic.py"]
+    timeout = 30
+
+    def login(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(
+            arch="armv7", kernel="builtin", options=["-initrd", cpio_file]
+        )
+        self.emulator.login()