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protobuf/protobuf.js/tests/api_root-deferred.js

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+var tape = require("tape");
+
+var protobuf  = require(".."),
+    Namespace = protobuf.Namespace,
+    Type      = protobuf.Type,
+    Field     = protobuf.Field;
+
+tape.test("extension fields", function(test) {
+
+    var root = new protobuf.Root({ noGoogleTypes: true }),
+        ns = new Namespace("my"),
+        type = new Type("DeclaringType"),
+        declaringField = new Field("declaringField", 1, "string", "optional", "ExtendedType");
+    root.add(ns.add(type.add(declaringField)));
+
+    test.deepEqual(root.deferred[0], declaringField, "should be deferred until their extended type can be resolved");
+
+    var extendedType = new Type("ExtendedType");
+    ns.add(extendedType);
+    var extensionField = extendedType.get(declaringField.fullName);
+    test.equal(extensionField, declaringField.extensionField, "should become available once their extended type is known");
+
+    type.remove(declaringField);
+    extensionField = extendedType.get(declaringField.fullName);
+    test.equal(extensionField, null, "should become unavailable when their declaring field is removed");
+
+    type.add(declaringField);
+    extensionField = extendedType.get(declaringField.fullName);
+    test.equal(extensionField, declaringField.extensionField, "should become instantly available if their extended type is knwon");
+
+    ns.remove(extendedType);
+    type.remove(declaringField);
+    type.add(declaringField);
+    test.throws(function() {
+        root.resolveAll();
+    }, Error, "should throw on resolveAll if there are unresolvable extensions");
+    type.remove(declaringField);
+
+    test.end();
+});