diff --git a/BUILD b/BUILD
index d74886f..e7b7df1 100644
--- a/BUILD
+++ b/BUILD
@@ -16,20 +16,23 @@
     ],
 )
 
-TEST_SRCS = "src/test/java/**/*Test.java"
-
 TEST_DEPS = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
     "@commons-io//jar",
     "@mime-types//jar",
     ":uploadvalidator__plugin",
 ]
 
+TEST_SRCS = [
+    "src/test/java/**/*Test.java",
+    "src/test/java/**/*IT.java",
+]
+
 java_library(
     name = "testutils",
     testonly = 1,
     srcs = glob(
         ["src/test/java/**/*.java"],
-        exclude = [TEST_SRCS],
+        exclude = TEST_SRCS,
     ),
     deps = TEST_DEPS,
 )
@@ -37,7 +40,19 @@
 junit_tests(
     name = "uploadvalidator_tests",
     testonly = 1,
-    srcs = glob([TEST_SRCS]),
+    srcs = glob(
+        ["src/test/java/**/*Test.java"]),
+    tags = ["uploadvalidator"],
+    deps = TEST_DEPS + [
+        ":testutils",
+    ],
+)
+
+junit_tests(
+    name = "uploadvalidator_integration_tests",
+    testonly = 1,
+    srcs = glob(
+        ["src/test/java/**/*IT.java"]),
     tags = ["uploadvalidator"],
     deps = TEST_DEPS + [
         ":testutils",
diff --git a/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/UploadValidatorIT.java b/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/UploadValidatorIT.java
new file mode 100644
index 0000000..e248540
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/uploadvalidator/UploadValidatorIT.java
@@ -0,0 +1,160 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed 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.
+
+package com.googlesource.gerrit.plugins.uploadvalidator;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.gerrit.acceptance.GitUtil;
+import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
+import com.google.gerrit.acceptance.PushOneCommit;
+import com.google.gerrit.acceptance.TestPlugin;
+import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
+import com.google.gerrit.entities.Permission;
+import com.google.gerrit.entities.RefNames;
+import com.google.gerrit.extensions.api.changes.DraftInput;
+import com.google.gerrit.extensions.api.changes.ReviewInput;
+import com.google.gerrit.extensions.api.changes.ReviewInput.DraftHandling;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.server.group.SystemGroupBackend;
+import com.google.inject.Inject;
+import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
+import org.eclipse.jgit.junit.TestRepository;
+import org.junit.Before;
+import org.junit.Test;
+
+@TestPlugin(
+    name = "uploadvalidator",
+    sysModule = "com.googlesource.gerrit.plugins.uploadvalidator.Module")
+public class UploadValidatorIT extends LightweightPluginDaemonTest {
+
+  @Inject
+  ProjectOperations projectOperations;
+
+  TestRepository<InMemoryRepository> clone;
+
+  void pushConfig(String config) throws Exception {
+    TestRepository<InMemoryRepository> allProjectRepo = cloneProject(allProjects, admin);
+    GitUtil.fetch(allProjectRepo, RefNames.REFS_CONFIG + ":config");
+    allProjectRepo.reset("config");
+    PushOneCommit push =
+        pushFactory.create(
+            admin.newIdent(), allProjectRepo, "Subject", "project.config", config);
+    PushOneCommit.Result res = push.to("refs/meta/config");
+    res.assertOkStatus();
+  }
+
+  @Before
+  public void setup() throws Exception {
+    pushConfig("[plugin \"uploadvalidator\"]\n" +
+        "    blockedFileExtension = jar\n" +
+        "    blockedFileExtension = .zip\n" +
+        "    blockedKeywordPattern = secr3t\n" +
+        "    invalidFilenamePattern = [%:@]\n" +
+        "    rejectWindowsLineEndings = true\n" +
+        "    maxPathLength = 20\n" +
+        "    rejectDuplicatePathnames = true\n" +
+        "");
+
+    projectOperations.project(allProjects).forUpdate()
+        .add(allow(Permission.READ).ref("refs/*").group(SystemGroupBackend.REGISTERED_USERS))
+        .add(allow(Permission.CREATE).ref("refs/*").group(SystemGroupBackend.REGISTERED_USERS))
+        .add(allow(Permission.PUSH).ref("refs/*").group(SystemGroupBackend.REGISTERED_USERS))
+        .update();
+
+    clone =
+        GitUtil.cloneProject(project, registerRepoConnection(project, admin));
+  }
+
+  @Test
+  public void testFileExtension() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject", "file.jar", "content")
+        .to("refs/heads/master")
+        .assertErrorStatus("blocked file extensions");
+
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject", "file.zip", "content")
+        .to("refs/heads/master")
+        .assertErrorStatus("blocked file extensions");
+  }
+
+  @Test
+  public void testKeywordComment() throws Exception {
+    PushOneCommit.Result r1 = createChange("Subject", "file.txt", "content");
+    DraftInput in = new DraftInput();
+    in.message = "the password is secr3t ! ";
+    in.path = "file.txt";
+    gApi.changes().id(r1.getChangeId()).revision("current").createDraft(in);
+
+    ReviewInput reviewIn = new ReviewInput();
+    reviewIn.drafts = DraftHandling.PUBLISH;
+    BadRequestException e = assertThrows(
+        BadRequestException.class,
+        () -> gApi.changes().id(r1.getChangeId()).revision("current").review(reviewIn)
+    );
+    assertThat(e.getMessage()).contains("banned words");
+  }
+
+  @Test
+  public void testKeyword() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject", "file.txt", "blah secr3t blah")
+        .to("refs/heads/master")
+        .assertErrorStatus("blocked keywords");
+  }
+  @Test
+  public void testFilenamePattern() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject", "f:le.txt", "content")
+        .to("refs/heads/master")
+        .assertErrorStatus("invalid filename");
+  }
+
+  @Test
+  public void testWindowsLineEndings() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject", "win.ini",
+            "content\r\nline2\r\n")
+        .to("refs/heads/master")
+        .assertErrorStatus("Windows line ending");
+  }
+
+  @Test
+  public void testPathLength() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject",
+            "123456789012345678901234567890.txt",
+            "content\nline2\n")
+        .to("refs/heads/master")
+        .assertErrorStatus("too long paths");
+  }
+
+  @Test
+  public void testUniqueName() throws Exception {
+    pushFactory
+        .create(admin.newIdent(), clone, "Subject",
+            ImmutableMap.of("a.txt",
+            "content\nline2\n",
+            "A.TXT",
+            "content")
+        )
+        .to("refs/heads/master")
+        .assertErrorStatus("duplicate pathnames");
+  }
+
+}