Test data types

301.13 Testing

Testing — Note 2 of 6

Normal, boundary, erroneous.

What you need to know

There are three types of test data: normal (typical valid input), boundary (at the edge of valid ranges), and erroneous (invalid input that should be rejected).

What to know

Normal: typical valid data (e.g. age = 25)
Boundary: at the limits (e.g. age = 0, age = 120)
Erroneous: invalid data (e.g. age = -5, age = "abc")
Test all three types for thorough coverage

Code examples

Test data for age 0-120

python

# Normal: 25, 50, 80
# Boundary: 0, 1, 119, 120
# Erroneous: -1, 121, "hello", 3.5

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Specification notes for programming are in Paper 2.