[fuzz]network-level WriteFilter generic fuzzer

test/extensions/filters/network/common/fuzz/BUILD

@@ -23,6 +23,15 @@ envoy_proto_library(
     ],
 )
 
+envoy_proto_library(
+    name = "network_writefilter_fuzz_proto",
+    srcs = ["network_writefilter_fuzz.proto"],
+    deps = [
+        "//test/fuzz:common_proto",
+        "@envoy_api//envoy/config/listener/v3:pkg",
+    ],
+)
+
 envoy_cc_test_library(
     name = "uber_readfilter_lib",
     srcs = [
@@ -59,3 +68,38 @@ envoy_cc_fuzz_test(
         "//test/config:utility_lib",
     ] + envoy_all_network_filters(),
 )
+
+envoy_cc_test_library(
+    name = "uber_writefilter_lib",
+    srcs = [
+        "uber_per_writefilter.cc",
+        "uber_writefilter.cc",
+    ],
+    hdrs = ["uber_writefilter.h"],
+    deps = [
+        ":network_writefilter_fuzz_proto_cc_proto",
+        "//source/common/config:utility_lib",
+        "//source/extensions/filters/network:well_known_names",
+        "//source/extensions/filters/network/common:utility_lib",
+        "//test/extensions/filters/network/common/fuzz/utils:network_filter_fuzzer_fakes_lib",
+        "//test/fuzz:utility_lib",
+        "//test/mocks/network:network_mocks",
+    ],
+)
+
+envoy_cc_fuzz_test(
+    name = "network_writefilter_fuzz_test",
+    srcs = ["network_writefilter_fuzz_test.cc"],
+    corpus = "network_writefilter_corpus",
+    # All Envoy network filters must be linked to the test in order for the fuzzer to pick
+    # these up via the NamedNetworkFilterConfigFactory.
+    deps = [
+        ":uber_writefilter_lib",
+        "//source/common/config:utility_lib",
+        "//source/extensions/filters/network/kafka:kafka_broker_config_lib",
+        "//source/extensions/filters/network/mongo_proxy:config",
+        "//source/extensions/filters/network/mysql_proxy:config",
+        "//source/extensions/filters/network/zookeeper_proxy:config",
+        "//test/config:utility_lib",
+    ],
+)