diff --git a/lib/analyze-action.js b/lib/analyze-action.js
index 9bfae0b60..cb078b4ef 100644
--- a/lib/analyze-action.js
+++ b/lib/analyze-action.js
@@ -94426,11 +94426,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/autobuild-action.js b/lib/autobuild-action.js
index a04c64286..842960f50 100644
--- a/lib/autobuild-action.js
+++ b/lib/autobuild-action.js
@@ -88898,11 +88898,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/init-action-post.js b/lib/init-action-post.js
index dd4513a9b..3d6a7deb3 100644
--- a/lib/init-action-post.js
+++ b/lib/init-action-post.js
@@ -130789,11 +130789,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/init-action.js b/lib/init-action.js
index 12c7c73cf..e1e3adc6e 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -92263,11 +92263,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/resolve-environment-action.js b/lib/resolve-environment-action.js
index dc3903dc7..67d710d89 100644
--- a/lib/resolve-environment-action.js
+++ b/lib/resolve-environment-action.js
@@ -88518,11 +88518,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/setup-codeql-action.js b/lib/setup-codeql-action.js
index a31eac0fe..59605c1fb 100644
--- a/lib/setup-codeql-action.js
+++ b/lib/setup-codeql-action.js
@@ -89845,11 +89845,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/start-proxy-action.js b/lib/start-proxy-action.js
index eb5f9a8f6..7a3f66e74 100644
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
@@ -104682,11 +104682,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/lib/upload-sarif-action.js b/lib/upload-sarif-action.js
index 7857564f5..e5fc6230a 100644
--- a/lib/upload-sarif-action.js
+++ b/lib/upload-sarif-action.js
@@ -91075,11 +91075,18 @@ async function sendUnhandledErrorStatusReport(actionName, actionStartedAt, error
     );
     if (statusReport !== void 0) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode."
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }
 
diff --git a/src/status-report.ts b/src/status-report.ts
index 30b50e83d..532e692f0 100644
--- a/src/status-report.ts
+++ b/src/status-report.ts
@@ -630,10 +630,17 @@ export async function sendUnhandledErrorStatusReport(
     );
     if (statusReport !== undefined) {
       await sendStatusReport(statusReport);
+    } else if (isInTestMode()) {
+      throw new Error(
+        "Failed to create status report for unhandled error in test mode.",
+      );
     }
   } catch (e) {
     logger.warning(
       `Failed to send the error status report: ${getErrorMessage(e)}.`,
     );
+    if (isInTestMode()) {
+      throw e;
+    }
   }
 }