[IMP] web: add Registry predicate

Before this commit, any value could be added to registries and the class
needed to be overridden to assert that added values would answer to a
certain predicate.

Now, the registry can be instantiated with a given predicate function
that all added value must pass to be registered (default: all values
are accepted).

Existing implentations have been adapted:
- FieldRegistry
- FieldRegistryOwl.

1 files changed, 15 insertions, 0 deletions

diff --git a/addons/web/static/tests/core/registry_tests.js b/addons/web/static/tests/core/registry_tests.js
index 9f9f7b467cb..eb3389a4383 100644
--- a/addons/web/static/tests/core/registry_tests.js
+++ b/addons/web/static/tests/core/registry_tests.js
@@ -70,6 +70,21 @@ QUnit.module('core', {}, function () {
         assert.deepEqual(registry.values(), ['bar', 'foo', 'qux']);
     });
 
+    QUnit.test("predicate prevents invalid values", function (assert) {
+        assert.expect(5);
+
+        const predicate = value => typeof value === "number";
+        const registry = new Registry(null, predicate);
+        registry.onAdd((key) => assert.step(key));
+
+        assert.ok(registry.add("age", 23));
+        assert.throws(
+            () => registry.add("name", "Fred"),
+            new Error(`Value of key "name" does not pass the addition predicate.`)
+        );
+        assert.deepEqual(registry.entries(), { age: 23 });
+        assert.verifySteps(["age"]);
+    });
 });
 
 });