# Use an independent shared bench test

Capture a synthetic input, then load and review a real test-file contract, compare with its value and refuse an invalid file without losing evidence.

Source: https://help.smartfact.ai/scannerbench/guides/shared-test

Audience: Supervisor

## Use an independent shared bench test

1. **Start capture in the focused box**

   Start capture in the focused box.

   Start capture explicitly. Only this box collects keyboard input. These keystrokes are simulated; the course does not measure a physical scanner.

2. **Capture the test value**

   Capture the test value.

   Scan the shared bench test’s Code 128 value. Browser keyboard delivery is demonstrated; barcode optics and symbology decoding are not qualified.

3. **Inspect what arrived**

   Inspect what arrived.

   Step 2 shows exactly what arrived, in quotes, with hidden characters shown as codes. Leaving step 1 pauses capture.

4. **Load the prepared shared bench-test file**

   Load the prepared shared bench-test file.

   In ordinary use, select a PrintBench test file in the file picker. This training control supplies a fixed synthetic file to the real importer. Nothing is uploaded.

5. **Select the independent Code 128 expectation**

   Select the independent Code 128 expectation.

   Inspect the issuer and version, then select a known value. Importing previews inert data and sets no expectation until you choose one; the exact comparison then checks the scan against the imported payload.

6. **Refuse an invalid bench-test file**

   Refuse an invalid bench-test file.

   The actual importer refuses a duplicate JSON member. The existing expectation and completed capture remain unchanged.

[Watch or practise this chapter](https://help.smartfact.ai/scannerbench/demo?guide=shared-test&chapter=shared-test&audience=office)