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Requs AI Training Series

How to design and test for hidden edge cases

Traditional "shall" testing won't uncover these edge cases. Neither will code coverage tools. This class teaches how to design controls for them — and how to actually test for them.

how to design and test edge cases training
1 Day
Virtual, self-guided — work through it at your own pace
Prerequisite Required
The Most Common Edge Cases class must be completed first
Beyond Shall Testing
"Shall" testing and code coverage tools won't catch what this class covers
01 — Authority

Our founder is the global leader in software failure mode analysis

Standards Body

IEEE 1633 Leadership

Chair of the 2026 IEEE 1633 working group — the governing standard for software reliability engineering.

Continual lessons learned applied to the world's largest defect density benchmarking study

Decades of Trending Data

While others fail to keep their model factors current with technology - we're on our 8th major revision since 1993.

World's largest database of software failures analyzed by root cause

CDE Taxonomy inventor

From it, we created the Common Defect Enumeration, the primary taxonomy currently adopted and cited across DOW technical frameworks.

02 — The Class

Knowing the edge case exists isn't the same as catching it

The prerequisite class shows you the hidden edge cases. This class is what to actually do about them. "Shall" testing only verifies requirements that were explicitly stated — it can't test for something nobody wrote down. Code coverage tools only tell you which lines of code executed, not whether the right edge case was ever considered. Both structurally miss the failure modes this class covers.

This class pairs naturally with Requs AI Edge Case — but doesn't require owning it. It's built to be useful on its own.

Prerequisite Required This class requires completing The Most Common Edge Cases first — this class picks up exactly where that one leaves off.
Capability
Without this training
With this training
Testing for hidden edge cases
"Shall" testing — verifies only what was explicitly written down
Test techniques aimed specifically at edge cases nobody wrote a requirement for
Catching them with existing tools
Code coverage tools — measure which lines ran, not which edge cases were considered
Methods built specifically for hidden, cross-cutting edge cases
Designing controls for them
Ad hoc, usually only after the defect is found in the field
Specific design controls for each class of hidden edge case
Builds on
N/A
Directly extends The Most Common Edge Cases class
03 — Curriculum

What the class covers

Two modules, covered in a single self-guided day.

§1Design

How to design for edge cases

What You'll Learn

How to translate each hidden edge case from the prerequisite class into a specific design control — the change that actually prevents the failure mode, not just documents it.

Why It Matters

An edge case that's recognized but not designed against will still ship. Design controls are what actually close the gap.

§2Testing

How to test edge cases

What You'll Learn

Test techniques built specifically for hidden edge cases — the kind that "shall" testing and code coverage tools structurally can't uncover, because nobody wrote a requirement for them in the first place.

Why It Matters

A design control that's never actually tested is a guess. This module is how you confirm it works before it ships.

04 — Class Details

Format, duration, and prerequisites

Duration

1 Day

Delivered as a single day of self-guided instruction.

Format

Virtual, Self-Guided

Work through the material on your own schedule, at your own pace.

Prerequisites

The Most Common Edge Cases

Required before taking this class. Requs AI Edge Case itself is recommended but not required to own.

Stop finding edge cases you can't yet design or test for.

Register for the class, or schedule a demonstration of Requs AI Edge Case.