diff --git a/core/libs/tests/GuestPlayGoDialog.cpp b/core/libs/tests/GuestPlayGoDialog.cpp
index e8a89d8e49..82e8c63de2 100644
--- a/core/libs/tests/GuestPlayGoDialog.cpp
+++ b/core/libs/tests/GuestPlayGoDialog.cpp
@@ -38,6 +38,8 @@ int main() {
     Require(scePlayGoDialogOpen(&openParam) == 0);
     Require(scePlayGoDialogGetStatus() == 3);
     Require(scePlayGoDialogUpdateStatus() == 3);
+    Require(scePlayGoDialogOpen(nullptr) == paramInvalid);
+    Require(scePlayGoDialogOpen(&openParam) == 0);
 
     PlayGoDialogResult result{};
     Require(scePlayGoDialogGetResult(&result) == 0);
@@ -51,5 +53,13 @@ int main() {
     Require(scePlayGoDialogTerminate() == 0);
     Require(scePlayGoDialogGetStatus() == 0);
     Require(scePlayGoDialogTerminate() == notInitialized);
+    Require(scePlayGoDialogClose() == notInitialized);
+    Require(scePlayGoDialogOpen(nullptr) == paramInvalid);
+    Require(scePlayGoDialogOpen(&openParam) == notInitialized);
+    Require(scePlayGoDialogGetResult(nullptr) == paramInvalid);
+    Require(scePlayGoDialogGetResult(&result) == static_cast<std::int32_t>(0x80B8000Au));
+    result.reserved[0] = 0;
+    Require(scePlayGoDialogGetResult(&result) == notInitialized);
+    Require(scePlayGoDialogUpdateStatus() == 0);
     return 0;
 }