This Anderson-Darling test for Laplacian distribution assumes that we do not know the location and scale parameters of the original distribution.
Null hypothesis: The sample data is drawn from a Laplacian distribution.
If result Anderson Statistic is larger than the critical value,
the null hypothesis is rejected at the corresponding significance level.
Source for critical values: https://www.tandfonline.com/doi/pdf/10.1081/SAC-9687287
Notion page describing the motive behind this: https://www.notion.so/Goodness-of-fit-test-for-stock-return-distributions-b5a8cfd59d3f4c6684c15842b8c6d0db