diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bb345c67..7ca438f7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -446,11 +446,20 @@ jobs:
       - name: Uninstall plugins
         run: wp plugin uninstall --deactivate --all
 
-      - name: Install BeyondWords plugin
-        run: wp plugin install /tmp/${{ vars.WP_ORG_PLUGIN_NAME }}.zip --force --activate
-
-      - name: Install third-party plugins
+      - name: Install plugins
         run: |
+          wp plugin uninstall --deactivate --all
+          wp plugin install /tmp/${{ vars.WP_ORG_PLUGIN_NAME }}.zip --force --activate
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/beyondwords-filter-content-params.zip --force
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/beyondwords-filter-player-script-onload.zip --force
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/beyondwords-filter-player-inline-script-tag.zip --force
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/beyondwords-filter-player-sdk-params.zip --force
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/cpt-active.zip --force --activate
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/cpt-inactive.zip --force --activate
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/cpt-unsupported.zip --force --activate
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/filter-pre-http-request.zip --force --activate
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/rest-api-insert.zip --force
+          wp plugin install ${{ github.workspace }}/tests/fixtures/wp-content/plugins/rest-api-publish.zip --force
           wp plugin install amp --force
           wp plugin install classic-editor --force
           wp plugin install plugin-check --force
diff --git a/.wp-env.json b/.wp-env.json
index cb611548..3c054900 100644
--- a/.wp-env.json
+++ b/.wp-env.json
@@ -27,6 +27,14 @@
     },
     "env": {
         "tests": {
+            "plugins": [
+                "WP-API/Basic-Auth",
+                "./tests/fixtures/wp-content/plugins/cpt-active",
+                "./tests/fixtures/wp-content/plugins/cpt-inactive",
+                "./tests/fixtures/wp-content/plugins/cpt-unsupported",
+                "./tests/fixtures/wp-content/plugins/filter-pre-http-request",
+                "./"
+            ],
             "config": {
                 "BEYONDWORDS_API_URL": "http://host.docker.internal:3000/v1",
                 "BEYONDWORDS_AUTO_SYNC_SETTINGS": false
diff --git a/cypress.config.js b/cypress.config.js
index 887f1440..b0dee818 100644
--- a/cypress.config.js
+++ b/cypress.config.js
@@ -86,7 +86,7 @@ function setupNodeEvents( on, config ) {
 				'plugin activate wp-reset',
 				'reset reset --yes',
 				'plugin deactivate --all',
-				'plugin activate speechkit Basic-Auth cpt-active cpt-inactive cpt-unsupported',
+				'plugin activate speechkit Basic-Auth cpt-active cpt-inactive cpt-unsupported filter-pre-http-request',
 				// Configure plugin credentials for most tests
 				`option update beyondwords_api_key '${ apiKey }'`,
 				`option update beyondwords_project_id '${ projectId }'`,
@@ -118,7 +118,7 @@ function setupNodeEvents( on, config ) {
 				'plugin activate wp-reset',
 				'reset reset --yes',
 				'plugin deactivate --all',
-				'plugin activate speechkit Basic-Auth cpt-active cpt-inactive cpt-unsupported',
+				'plugin activate speechkit Basic-Auth cpt-active cpt-inactive cpt-unsupported filter-pre-http-request',
 			] );
 
 			// Reset the flag so next test file will run setupDatabase again
diff --git a/tests/fixtures/wp-content/plugins/filter-pre-http-request.zip b/tests/fixtures/wp-content/plugins/filter-pre-http-request.zip
new file mode 100644
index 00000000..15bafbd5
Binary files /dev/null and b/tests/fixtures/wp-content/plugins/filter-pre-http-request.zip differ
diff --git a/tests/fixtures/wp-content/plugins/filter-pre-http-request/filter-pre-http-request.php b/tests/fixtures/wp-content/plugins/filter-pre-http-request/filter-pre-http-request.php
new file mode 100644
index 00000000..59e96754
--- /dev/null
+++ b/tests/fixtures/wp-content/plugins/filter-pre-http-request/filter-pre-http-request.php
@@ -0,0 +1,43 @@
+<?php
+/**
+ * Filter the HTTP requests made during testing.
+ *
+ * @package           BeyondWords
+ * @license           GPL-2.0-or-later
+ *
+ * @wordpress-plugin
+ * Plugin Name:       BeyondWords Filter: pre_http_request
+ * Description:       Filter WordPress HTTP requests made during testing.
+ * Author:            BeyondWords
+ * Text Domain:       speechkit
+ * License:           No License
+ */
+function my_pre_http_request( false|array|WP_Error $response, array $parsed_args, string $url ) {
+    // @todo Check this is a HTTP request to a specific domain.
+    if (strpos($url, 'http(s)://any_domain.com') === false) {
+        return $response;
+    }
+
+    // @todo check the parsed_args param to determine which response we should return.
+
+    // @todo Return a response object to short-circuit the request.
+    return [
+        'body' => [
+            'id' => 1,
+        ],
+        'headers' => [
+            'content-type' => 'application/json',
+        ],
+        'response' => [
+            'code' => 201,
+        ],
+    ];
+
+    // @todo Alternatively return a WP_Error object to block the request.
+    return new WP_Error(
+        'http_request_block',
+        __( 'This request is not allowed', 'speechkit' )
+    );
+}
+
+add_filter( 'pre_http_request', 'my_pre_http_request' );