Initial version of Blueprint.copy, with a test case.

tests/test_blueprint_copy.py

@@ -0,0 +1,24 @@
+from copy import deepcopy
+
+from sanic import Blueprint, Sanic, blueprints, response
+from sanic.response import text
+
+
+def test_bp_copy(app: Sanic):
+    bp1 = Blueprint("test1", version=1)
+
+    @bp1.route("/page")
+    def handle_request(request):
+        return text("Hello world!")
+
+    bp2 = bp1.copy(name="test2", version=2)
+    assert id(bp1) != id(bp2)
+
+    app.blueprint(bp1)
+    app.blueprint(bp2)
+
+    _, response = app.test_client.get("/v1/page")
+    assert "Hello world!" in response.text
+
+    _, response = app.test_client.get("/v2/page")
+    assert "Hello world!" in response.text