diff --git a/bin/generate-oas.php b/bin/generate-oas.php
index b4875ec75..81660d22d 100755
--- a/bin/generate-oas.php
+++ b/bin/generate-oas.php
@@ -12,8 +12,16 @@
     exit(1);
 });
 
+$testing = in_array('--testing', $argv, true);
+$language = 'en';
+foreach (array_slice($argv, 1) as $arg) {
+    if ($arg[0] !== '-') {
+        $language = $arg;
+        break;
+    }
+}
+
 echo "\nCreating translated OpenAPI file ...\n";
-$language = $argv[1] ?? 'en';
 $generate = new Hello\OpenApi\Translate($language);
 $generate->run();
 $generate->printResults();
@@ -21,3 +29,9 @@
 echo "\nCreating SDK-specific OpenAPI file ...\n";
 $generate = new Hello\OpenApi\GenerateSdkOas();
 $generate->run();
+
+if ($testing) {
+    echo "\nCreating testing SDK OpenAPI file (no hideOn filtering) ...\n";
+    $generate = new Hello\OpenApi\GenerateSdkOas(true);
+    $generate->run();
+}
diff --git a/build b/build
index 470d514b3..836b0a91b 100755
--- a/build
+++ b/build
@@ -3,7 +3,19 @@
 set -e
 
 DIR=$(cd `dirname $0` && pwd)
-LANGUAGE="${1:-en}"
+LANGUAGE="en"
+TESTING=""
+
+for arg in "$@"; do
+  case $arg in
+    --testing)
+      TESTING="--testing"
+      ;;
+    *)
+      LANGUAGE="$arg"
+      ;;
+  esac
+done
 
 printf "Language chosen: ${LANGUAGE}\n"
 
@@ -12,7 +24,7 @@ mkdir -p "${DIR}/vendor"
 bash "${DIR}/bin/php" composer install
 printf "\n"
 
-bash "${DIR}/bin/php" ./bin/generate-oas.php
+bash "${DIR}/bin/php" ./bin/generate-oas.php ${TESTING}
 
 "${DIR}/bin/copy-examples-filtered" "${DIR}/examples" "${DIR}/sandbox/dotnet/src/Dropbox.SignSandbox" cs
 "${DIR}/bin/copy-examples-filtered" "${DIR}/examples" "${DIR}/sandbox/java/src/main/java/com/dropbox/sign_sandbox" java
diff --git a/generate-sdks b/generate-sdks
index 2fff0366b..bc44d86f8 100755
--- a/generate-sdks
+++ b/generate-sdks
@@ -6,13 +6,22 @@ DIR=$(cd `dirname $0` && pwd)
 SDKS=( dotnet java-v1 java-v2 node php python ruby )
 SHOW_HELP=0
 TARGET_SDK=
+TESTING=0
 
-while getopts ":t:h" opt; do
+while getopts ":t:h-:" opt; do
   case $opt in
     t) TARGET_SDK="$OPTARG"
     ;;
     h) SHOW_HELP=1
     ;;
+    -)
+      case "${OPTARG}" in
+        testing) TESTING=1
+        ;;
+        *) echo "Invalid option --$OPTARG" >&2
+        ;;
+      esac
+    ;;
     \?) echo "Invalid option -$OPTARG" >&2
     ;;
   esac
@@ -55,8 +64,10 @@ Builds a given SDK into the sdks/[SDK] directory.
             be DELETED and REBUILT!
 
 -t          target SDK, "all", "dotnet", "java-v2", "java-v1", "node", "php", "python", "ruby"
+--testing   use openapi-sdk-testing.yaml (includes all hideOn endpoints)
 -h          display this help and exit
 Example: generate-sdks -t php
+Example: generate-sdks -t php --testing
 EOF
 
     exit 0
@@ -140,9 +151,16 @@ function copy_oas()
   SDK="$1"
   SDK_DIR="${DIR}/sdks/${SDK}"
 
-  printf "Copying openapi-sdk.yaml ...\n"
+  if [[ $TESTING -eq 1 ]]; then
+    OAS_FILE="${DIR}/openapi-sdk-testing.yaml"
+    printf "Copying openapi-sdk-testing.yaml ...\n"
+  else
+    OAS_FILE="${DIR}/openapi-sdk.yaml"
+    printf "Copying openapi-sdk.yaml ...\n"
+  fi
+
   rm -f "${SDK_DIR}/openapi-sdk.yaml"
-  cp -r "${DIR}/openapi-sdk.yaml" "${SDK_DIR}/openapi-sdk.yaml"
+  cp -r "${OAS_FILE}" "${SDK_DIR}/openapi-sdk.yaml"
 }
 
 function copy_examples()
diff --git a/src/Hello/OpenApi/GenerateSdkOas.php b/src/Hello/OpenApi/GenerateSdkOas.php
index d97f7b1b2..fd4b8db3a 100644
--- a/src/Hello/OpenApi/GenerateSdkOas.php
+++ b/src/Hello/OpenApi/GenerateSdkOas.php
@@ -10,6 +10,13 @@ class GenerateSdkOas
 
     private const SURFACE_ID = 'sdk';
 
+    private bool $testing;
+
+    public function __construct(bool $testing = false)
+    {
+        $this->testing = $testing;
+    }
+
     public function run(): void
     {
         $raw_file = new RawFile(self::ROOT_DIR . '/openapi-raw.yaml');
@@ -17,13 +24,17 @@ public function run(): void
         $raw_file->translate(
             self::SURFACE_ID,
             $translation_file,
-            $translation_file
+            $translation_file,
+            $this->testing
         );
 
         $data = $raw_file->getData();
         unset($data['tags']);
         $raw_file->setData($data);
 
-        $raw_file->saveFile(self::ROOT_DIR . '/openapi-sdk.yaml');
+        $output_file = $this->testing
+            ? self::ROOT_DIR . '/openapi-sdk-testing.yaml'
+            : self::ROOT_DIR . '/openapi-sdk.yaml';
+        $raw_file->saveFile($output_file);
     }
 }
diff --git a/src/Hello/OpenApi/RawFile.php b/src/Hello/OpenApi/RawFile.php
index fcfa42cc3..04f57ef28 100644
--- a/src/Hello/OpenApi/RawFile.php
+++ b/src/Hello/OpenApi/RawFile.php
@@ -67,10 +67,11 @@ public function __construct(string $filename)
     public function translate(
         string $surface_id,
         string $translation_file,
-        string $fallback_file
+        string $fallback_file,
+        bool $skip_hide_on = false
     ): void {
         $this->loadTranslations($translation_file, $fallback_file);
-        $result = $this->recurse($this->openapi, $surface_id);
+        $result = $this->recurse($this->openapi, $surface_id, $skip_hide_on);
 
         $this->logs['translated'] = array_unique($this->logs['translated']);
         $this->logs['fallback'] = array_unique($this->logs['fallback']);
@@ -160,18 +161,18 @@ private function loadTranslations(string $file, string $fallback): void
      * searching for strings prepended with TRANSLATE_PREPEND and attempting
      * to translate them.
      */
-    private function recurse(array $data, string $surface_id): TranslationResult
+    private function recurse(array $data, string $surface_id, bool $skip_hide_on = false): TranslationResult
     {
         $empty_by_hiding = false;
 
         foreach ($data as $k => $v) {
             if (is_iterable($v)) {
-                if (isset($v[self::HIDE_ON]) && $this->shouldHide($v[self::HIDE_ON], $surface_id)) {
+                if (!$skip_hide_on && isset($v[self::HIDE_ON]) && $this->shouldHide($v[self::HIDE_ON], $surface_id)) {
                     unset($data[$k]);
                     $empty_by_hiding = empty($data);
                 } else {
                     unset($v[self::HIDE_ON]);
-                    $result = $this->recurse($v, $surface_id);
+                    $result = $this->recurse($v, $surface_id, $skip_hide_on);
                     if ($result->isAllHidden()) {
                         unset($data[$k]);
                     } else {