test/fmt_v2: add validation testing

Add a new test to check that validation works for the basic test
pipeline. This needs to be extended in the future to check that
invalid data is being caught properly, but it is a start.

test/mod/test_fmt_v2.py

@@ -68,6 +68,22 @@ class TestFormatV1(unittest.TestCase):
     def setUp(self):
         self.index = osbuild.meta.Index(os.curdir)
 
+    def load_manifest(self, desc):
+        info = self.index.detect_format_info(desc)
+        self.assertIsNotNone(info)
+        fmt = info.module
+        self.assertIsNotNone(fmt)
+        manifest = fmt.load(desc, self.index)
+        return manifest, fmt
+
+    def assert_validation(self, result):
+        if result.valid:
+            return
+
+        msg = "Validation failed:\n"
+        msg += "\n".join(str(e) for e in result.errors)
+        self.fail(msg)
+
     def test_load(self):
 
         desc = BASIC_PIPELINE
@@ -107,3 +123,10 @@ class TestFormatV1(unittest.TestCase):
         # the basic test manifest
         info = index.detect_format_info(BASIC_PIPELINE)
         self.assertEqual(info.version, "2")
+
+    def test_validation(self):
+        desc = BASIC_PIPELINE
+        _, fmt = self.load_manifest(desc)
+
+        res = fmt.validate(desc, self.index)
+        self.assert_validation(res)