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Jan Van Ryswyck

Owner @ Principal IT, husband, father of three, geek, enjoys running, fan boy of many things but nothing in particular.

Work

Software craftsman at Principal IT

Six Year Club
Five Year Club
Writing Debut
Four Year Club
Three Year Club
Two Year Club
One Year Club
4 Week Writing Streak
The Saff Squeeze

The Saff Squeeze

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2 min read
Fixing vs Preventing Defects

Fixing vs Preventing Defects

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1 min read
Tales Of TDD: One Test Double To Rule Them All

Tales Of TDD: One Test Double To Rule Them All

3
Comments
2 min read
Perspectives On Software Quality

Perspectives On Software Quality

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1 min read
The Five Underplayed Premises Of TDD

The Five Underplayed Premises Of TDD

Comments 1
2 min read
Contract Tests - Parameterised Test Cases

Contract Tests - Parameterised Test Cases

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4 min read
Contract Tests - Abstract Test Cases

Contract Tests - Abstract Test Cases

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4 min read
Contract Tests

Contract Tests

1
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3 min read
The Testing Quadrant

The Testing Quadrant

5
Comments
3 min read
Tales Of TDD: The Big Refactoring

Tales Of TDD: The Big Refactoring

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Comments
5 min read
Implementing Approval Tests For PDF Document Generation

Implementing Approval Tests For PDF Document Generation

5
Comments
4 min read
Approval Tests For PDF Document Generation

Approval Tests For PDF Document Generation

6
Comments
5 min read
Ignoring Tests

Ignoring Tests

4
Comments
5 min read
Writing Maintainable Unit Tests In Print

Writing Maintainable Unit Tests In Print

Comments
1 min read
Tales Of TDD - The Case Of Overused Test Doubles

Tales Of TDD - The Case Of Overused Test Doubles

5
Comments 1
5 min read
Book Launch: Writing Maintainable Unit Tests

Book Launch: Writing Maintainable Unit Tests

Comments
2 min read
Avoid Inheritance For Test Classes

Avoid Inheritance For Test Classes

1
Comments
4 min read
How To Write Unit Tests For Logging

How To Write Unit Tests For Logging

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Comments
4 min read
Prevent domain knowledge from sneaking into solitary tests

Prevent domain knowledge from sneaking into solitary tests

4
Comments
3 min read
Why Solitary Tests Should Be Easy To Read

Why Solitary Tests Should Be Easy To Read

2
Comments
3 min read
Tales Of TDD - Stressed And Always In A Hurry

Tales Of TDD - Stressed And Always In A Hurry

5
Comments
5 min read
Dealing With Date/Time In Solitary Tests

Dealing With Date/Time In Solitary Tests

1
Comments
4 min read
Announcing Book: Writing Maintainable Unit Tests

Announcing Book: Writing Maintainable Unit Tests

4
Comments
1 min read
Only Test Through Public Interfaces

Only Test Through Public Interfaces

1
Comments
3 min read
Inside-Out and Outside-In TDD

Inside-Out and Outside-In TDD

1
Comments
4 min read
Test Double Heuristics

Test Double Heuristics

6
Comments
4 min read
Excessive Specification of Test Doubles

Excessive Specification of Test Doubles

1
Comments
2 min read
The Boundaries of Solitary Tests

The Boundaries of Solitary Tests

3
Comments
7 min read
Test Doubles

Test Doubles

1
Comments
10 min read
Indirect Inputs and Outputs

Indirect Inputs and Outputs

1
Comments
4 min read
State versus Behaviour Verification

State versus Behaviour Verification

6
Comments
5 min read
Cascading Failures

Cascading Failures

6
Comments
7 min read
The Designing versus Testing Mindset

The Designing versus Testing Mindset

5
Comments
2 min read
Why Write Maintainable Unit Tests?

Why Write Maintainable Unit Tests?

5
Comments
3 min read
Writing Maintainable Unit Tests

Writing Maintainable Unit Tests

5
Comments
1 min read
The Test Pyramid

The Test Pyramid

4
Comments
3 min read
A Taxonomy Of Tests

A Taxonomy Of Tests

5
Comments
3 min read
Do-nothing Scripting

Do-nothing Scripting

5
Comments
1 min read
Switched From Opera to Vivaldi

Switched From Opera to Vivaldi

3
Comments
1 min read
Fast Feedback

Fast Feedback

4
Comments
4 min read
Debugability Considered Useful

Debugability Considered Useful

6
Comments
3 min read
Blaming Mocks For Bad Design

Blaming Mocks For Bad Design

5
Comments
4 min read
Listening to the Vital Signs of TDD

Listening to the Vital Signs of TDD

6
Comments
6 min read
All in the Name of DRY

All in the Name of DRY

3
Comments
4 min read
Memo on O-Ring and Software Erosion

Memo on O-Ring and Software Erosion

3
Comments
3 min read
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