fix(word generation): time mode tests causing errors when repeated

frontend/src/ts/test/words-generator.ts

@@ -698,11 +698,30 @@ export async function getNextWord(
     const repeated = previousGetNextWordReturns[wordIndex];
 
     if (repeated === undefined) {
-      throw new WordGenError("Repeated word is undefined");
-    }
+      // if the repeated word is undefined, that means we are out of words from the previous test
+      // we need to either throw, or revert to random generation
+      // reverting should only happen in certain cases
+
+      let continueRandomGeneration = false;
+
+      if (
+        Config.mode === "time" ||
+        (Config.mode === "custom" && CustomText.getLimitMode() === "time")
+      ) {
+        continueRandomGeneration = true;
+      }
 
-    console.debug("Repeated word: ", repeated);
-    return repeated;
+      if (!continueRandomGeneration) {
+        throw new WordGenError("Repeated word is undefined");
+      } else {
+        console.debug(
+          "Repeated word is undefined but random generation is allowed - getting random word"
+        );
+      }
+    } else {
+      console.debug("Repeated word: ", repeated);
+      return repeated;
+    }
   }
 
   const funboxFrequency = getFunboxWordsFrequency() ?? "normal";