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protobuf/protobuf.js/tests/api_oneof.js

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+var tape = require("tape");
+
+var protobuf = require("..");
+
+var def = {
+    oneof: ["a", "b"],
+    options: {}
+};
+
+var proto = "syntax = \"proto3\";\
+message Test {\
+    oneof kind {\
+        uint32 a = 1;\
+        string b = 2;\
+    }\
+    bool c = 3;\
+}";
+
+tape.test("reflected oneofs", function(test) {
+
+    var oneof = protobuf.OneOf.fromJSON("kind", {
+        oneof: ["a", "b"],
+        options: {}
+    });
+    test.same(oneof.toJSON(), def, "should construct from and convert back to JSON");
+
+    var root = protobuf.parse(proto).root;
+    var Test = root.lookup("Test");
+    var kind = Test.get("kind");
+    var field = Test.get("c");
+
+    kind.add(field);
+    test.same(kind.toJSON(), {
+        oneof: ["a", "b", "c"]
+    }, "should allow adding fields");
+    test.ok(Test.get("c"), "should still have the field on the parent");
+
+    kind.remove(field);
+    test.same(kind.toJSON(), {
+        oneof: ["a", "b"]
+    }, "should allow removing fields");
+    test.ok(Test.get("c"), "should still have the field on the parent");
+
+    var Test2 = new protobuf.Type("Test2");
+    root.add(Test2);
+    Test2.add(field);
+    kind.add(field);
+    test.notOk(Test2.get("c"), "should remove the field from the previous parent");
+
+    var looseField = new protobuf.Field("d", 4, "float");
+    kind.add(looseField); // no parent
+    Test.remove(looseField);
+    Test.remove(kind);
+    test.same(Test.fields, {}, "should remove all fields from the parent");
+    test.same(kind.oneof, ["a","b","c","d"], "should still have the fields on the oneof");
+
+    test.end();
+});