test: show pending exception error in napi tests

Shows the result of the wasPending in the error message if the assertion fails. Backport-PR-URL: #19265 PR-URL: #18413 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>

Author: blairwilcox

test/addons-napi/test_exception/test.js

@@ -20,9 +20,10 @@ const theError = new Error('Some error');
 
 // Test that the exception thrown above was marked as pending
 // before it was handled on the JS side
-assert.strictEqual(test_exception.wasPending(),true,
-'VM was marked as having an exception pending'+
-' when it was allowed through');
+constexception_pending=test_exception.wasPending();
+assert.strictEqual(exception_pending,true,
+'Exception not pending as expected,'+
+` .wasPending() returned ${exception_pending}`);
 
 // Test that the native side does not capture a non-existing exception
 returnedError=test_exception.returnException(common.mustCall());
@@ -44,7 +45,8 @@ const theError = new Error('Some error');
 ` ${caughtError} was passed`);
 
 // Test that the exception state remains clear when no exception is thrown
-assert.strictEqual(test_exception.wasPending(),false,
-'VM was not marked as having an exception pending'+
-' when none was allowed through');
+constexception_pending=test_exception.wasPending();
+assert.strictEqual(exception_pending,false,
+'Exception state did not remain clear as expected,'+
+` .wasPending() returned ${exception_pending}`);
 }