diff --git a/tests/gold_tests/cache/background_fill.test.py b/tests/gold_tests/cache/background_fill.test.py
new file mode 100644
index 00000000000..5be9047289b
--- /dev/null
+++ b/tests/gold_tests/cache/background_fill.test.py
@@ -0,0 +1,140 @@
+'''
+'''
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from enum import Enum
+
+Test.Summary = 'Exercise Background Fill'
+Test.SkipUnless(
+    Condition.HasCurlFeature('http2'),
+)
+Test.ContinueOnFail = True
+
+
+class BackgroundFillTest:
+    """
+    https://docs.trafficserver.apache.org/en/latest/admin-guide/files/records.config.en.html#proxy-config-http-background-fill-completed-threshold
+    """
+
+    class State(Enum):
+        """
+        State of process
+        """
+        INIT = 0
+        RUNNING = 1
+
+    def __init__(self):
+        self.state = self.State.INIT
+        self.__setupOriginServer()
+        self.__setupTS()
+
+    def __setupOriginServer(self):
+        self.httpbin = Test.MakeHttpBinServer("httpbin")
+
+    def __setupTS(self):
+        self.ts = Test.MakeATSProcess(
+            "ts", select_ports=True, enable_tls=True, enable_cache=True)
+
+        self.ts.addDefaultSSLFiles()
+        self.ts.Disk.ssl_multicert_config.AddLine(
+            "dest_ip=* ssl_cert_name=server.pem ssl_key_name=server.key")
+
+        self.ts.Disk.records_config.update({
+            "proxy.config.http.server_ports": f"{self.ts.Variables.port} {self.ts.Variables.ssl_port}:ssl",
+            'proxy.config.ssl.server.cert.path': f"{self.ts.Variables.SSLDir}",
+            'proxy.config.ssl.server.private_key.path': f"{self.ts.Variables.SSLDir}",
+            "proxy.config.diags.debug.enabled": 1,
+            "proxy.config.diags.debug.tags": "http",
+            "proxy.config.http.background_fill_active_timeout": "0",
+            "proxy.config.http.background_fill_completed_threshold": "0.0",
+            "proxy.config.http.cache.required_headers": 0,  # Force cache
+            "proxy.config.http.insert_response_via_str": 2,
+        })
+
+        self.ts.Disk.remap_config.AddLines([
+            f"map / http://127.0.0.1:{self.httpbin.Variables.Port}/",
+        ])
+
+    def __checkProcessBefore(self, tr):
+        if self.state == self.State.RUNNING:
+            tr.StillRunningBefore = self.httpbin
+            tr.StillRunningBefore = self.ts
+        else:
+            tr.Processes.Default.StartBefore(self.httpbin, ready=When.PortOpen(self.httpbin.Variables.Port))
+            tr.Processes.Default.StartBefore(self.ts)
+            self.state = self.State.RUNNING
+
+    def __checkProcessAfter(self, tr):
+        assert (self.state == self.State.RUNNING)
+        tr.StillRunningAfter = self.httpbin
+        tr.StillRunningAfter = self.ts
+
+    def __testCase0(self):
+        """
+        HTTP/1.1 over TCP
+        """
+        tr = Test.AddTestRun()
+        self.__checkProcessBefore(tr)
+        tr.Processes.Default.Command = f"""
+curl -X PURGE --http1.1 -vs http://127.0.0.1:{self.ts.Variables.port}/drip?duration=4;
+timeout 2 curl --http1.1 -vs http://127.0.0.1:{self.ts.Variables.port}/drip?duration=4;
+sleep 2;
+curl --http1.1 -vs http://127.0.0.1:{self.ts.Variables.port}/drip?duration=4
+"""
+        tr.Processes.Default.ReturnCode = 0
+        tr.Processes.Default.Streams.stderr = "gold/background_fill_0_stderr.gold"
+        self.__checkProcessAfter(tr)
+
+    def __testCase1(self):
+        """
+        HTTP/1.1 over TLS
+        """
+        tr = Test.AddTestRun()
+        self.__checkProcessBefore(tr)
+        tr.Processes.Default.Command = f"""
+curl -X PURGE --http1.1 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4;
+timeout 2 curl --http1.1 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4;
+sleep 2;
+curl --http1.1 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4
+"""
+        tr.Processes.Default.ReturnCode = 0
+        tr.Processes.Default.Streams.stderr = "gold/background_fill_1_stderr.gold"
+        self.__checkProcessAfter(tr)
+
+    def __testCase2(self):
+        """
+        HTTP/2 over TLS
+        """
+        tr = Test.AddTestRun()
+        self.__checkProcessBefore(tr)
+        tr.Processes.Default.Command = f"""
+curl -X PURGE --http2 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4;
+timeout 2 curl --http2 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4;
+sleep 2;
+curl --http2 -vsk https://127.0.0.1:{self.ts.Variables.ssl_port}/drip?duration=4
+"""
+        tr.Processes.Default.ReturnCode = 0
+        tr.Processes.Default.Streams.stderr = "gold/background_fill_2_stderr.gold"
+        self.__checkProcessAfter(tr)
+
+    def run(self):
+        self.__testCase0()
+        self.__testCase1()
+        self.__testCase2()
+
+
+BackgroundFillTest().run()
diff --git a/tests/gold_tests/cache/gold/background_fill_0_stderr.gold b/tests/gold_tests/cache/gold/background_fill_0_stderr.gold
new file mode 100644
index 00000000000..aa205297c19
--- /dev/null
+++ b/tests/gold_tests/cache/gold/background_fill_0_stderr.gold
@@ -0,0 +1,19 @@
+``
+> PURGE /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 ``
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/``)
+``
+> GET /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 200 OK
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/`` [cMsSfW])
+``
+> GET /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 200 OK
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/`` [cHs f ])
+``
diff --git a/tests/gold_tests/cache/gold/background_fill_1_stderr.gold b/tests/gold_tests/cache/gold/background_fill_1_stderr.gold
new file mode 100644
index 00000000000..aa205297c19
--- /dev/null
+++ b/tests/gold_tests/cache/gold/background_fill_1_stderr.gold
@@ -0,0 +1,19 @@
+``
+> PURGE /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 ``
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/``)
+``
+> GET /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 200 OK
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/`` [cMsSfW])
+``
+> GET /drip?duration=4 HTTP/1.1
+``
+< HTTP/1.1 200 OK
+``
+< Via: http/1.1 traffic_server (ApacheTrafficServer/`` [cHs f ])
+``
diff --git a/tests/gold_tests/cache/gold/background_fill_2_stderr.gold b/tests/gold_tests/cache/gold/background_fill_2_stderr.gold
new file mode 100644
index 00000000000..d71ba6c834d
--- /dev/null
+++ b/tests/gold_tests/cache/gold/background_fill_2_stderr.gold
@@ -0,0 +1,19 @@
+``
+> PURGE /drip?duration=4 HTTP/2
+``
+< HTTP/2 ``
+``
+< via: http/1.1 traffic_server (ApacheTrafficServer/``)
+``
+> GET /drip?duration=4 HTTP/2
+``
+< HTTP/2 200 ``
+``
+< via: http/1.1 traffic_server (ApacheTrafficServer/`` [cMsSfW])
+``
+> GET /drip?duration=4 HTTP/2
+``
+< HTTP/2 200 ``
+``
+< via: http/1.1 traffic_server (ApacheTrafficServer/`` [cHs f ])
+``