Fix: Clarify exact average calculation expectation

tests/6_csv_processor/test.js

@@ -3,17 +3,22 @@ export default {
   prompt: `// Write an async JavaScript function 'processCSV' that parses CSV data, filters rows, and performs aggregations.
 // - The function must accept a CSV string and a configuration object: { filterColumn: string, filterValue: any, groupBy: string, aggregateColumn: string, operation: 'sum'|'avg'|'count' }.
 // - You MUST use dynamic import() to load one or more libraries from a CDN for CSV parsing and data manipulation.
-// - Parse the CSV, filter rows where filterColumn equals filterValue, group by groupBy column, and perform the specified aggregation.
-// - Return an array of objects with the groupBy value and the aggregated result, e.g. [{ department: 'Engineering', result: 90000 }].`,
+// - Parse the CSV with headers. Filter rows where filterColumn equals filterValue (use loose equality ==).
+// - Group filtered rows by the groupBy column value.
+// - For each group, perform the operation on the aggregateColumn: 'sum' adds all values, 'avg' calculates mean (sum/count), 'count' returns row count.
+// - Convert aggregateColumn values to numbers. Treat non-numeric values as 0.
+// - Return an array of objects, one per group: [{ [groupBy]: groupValue, result: aggregatedNumber }].
+// - For 'avg', return the exact mathematical average without rounding.`,
   runTest: async (processCSV) => {
     const assert = {
-      deepStrictEqual: (a, e, m) => { if (JSON.stringify(a) !== JSON.stringify(e)) throw new Error(m) },
+      strictEqual: (a, e, m) => { if (a !== e) throw new Error(m || `FAIL: ${a} !== ${e}`) },
     };
     const csv = `name,department,salary\nAlice,Engineering,90000\nBob,Engineering,85000\nCharlie,Sales,70000\nDiana,Engineering,95000\nEve,Sales,72000`;
     const config = { filterColumn: 'department', filterValue: 'Engineering', groupBy: 'department', aggregateColumn: 'salary', operation: 'avg' };
     const result = await processCSV(csv, config);
-    const res = result[0] || {};
-    const val = res.result ?? res.avg ?? res.value;
-    assert.deepStrictEqual([{ department: res.department, result: val }], [{ department: 'Engineering', result: 90000 }], 'Test Failed: Aggregation incorrect.');
+    assert.strictEqual(result.length, 1, 'Test Failed: Should return exactly 1 group.');
+    const res = result[0];
+    assert.strictEqual(res.department, 'Engineering', 'Test Failed: Wrong department.');
+    assert.strictEqual(res.result, 90000, 'Test Failed: Average should be exactly 90000.');
   }
 };