Testing case study plan

• Derrive tests for blackbox testing using equivalence partitioning
• Triangle problem exercise (sides are not independent input (use triples)
  • what is a partition (set of inputs within a particualr area (valid/invalid, a range etc.)
  • what are the partition inputs, how do they combine, do they have specific outputs

Application of equivalence partitioning

• how can testing be down to existing applications
• Consider all possible cases that could occur

TRIANGLE PROBLEM EXERCISE

• input must be an integer (not string, or alphabetical)
• must be a valid integer (not negative)
• must be valid triangle (3 sides, sides must be connected)
• must be valid type of triangle (scalene, isocoleces, equltateral)

Testing a UK Tax Allowance Calculator EXERCISE

• Use gov.uk website to get definitions of tax bands, personal allowances, how tax should be calculated etc.
• Use this to define equivalence partitions, categories of inputs, how they are defined, how they combine

Blackbox testing existing app

• define valid income (totsl income per annum/year, must be numeric value)
• Edgecases:
  • money can be sometimes problematic to define correctly when using floats
  • salary should be in GDP (British pounds) eg. £[1100.52]
  • best way to avoid errors when using percentages convert to pence? so using integers not floats then apply rules? (simple way to handle but could be more specific if required - see how money in handled in code for finance apps?)
  • is tax rounded up or down if half a pence (down?)
  • after calculations convert back to pounds and pence format for user (expected format), ensure this is done correctly
• define tax band ranges
• define tax free allowance