Copyright © 2011, Industrial Logic, Inc. All Rights Reserved. Good Metrics for a TDD Program “Less is More” Naresh Jain [email protected] 1
Good Metrics for TDD
May 06, 2015
Often companies who are new to TDD ask us, what should we measure to know if we are headed in the right direction with regards to TDD. Here are some things you might consider. My take is, less is more. Don't measure 100 things, focus on a few at a time and move on.
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Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Good Metrics for a TDD Program
“Less is More”
Naresh [email protected]
1
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
C3 - TreeMap
• Coverage
• Complexity
• Churn
2
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Test vs. Production Code
0
15,000
30,000
45,000
60,000
15 Feb 2 Mar 17 Mar 1 Apr 18 Apr 1 May 16 May 31 May 15 Jun 30 Jun
Src LOC Test LOC
Usually Test Driven code has more Test Code than Production Code3
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Test Run Trend with every CI Build
0
75
150
225
300
B1 B2 B3 B4 B5 B6 B7 B8
# of Failing Test # of Passing
Each Build
4
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Test Balance• # of commits that include Tests over time (weekly)
0
37.5
75.0
112.5
150.0
W1 W2 W3 W4 W5 W6 W7
Commits With Tests Commits Without Tests
5
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Test Churn• # of tests added/removed over time (weekly)
0
15
30
45
60
W1 W2 W3 W4 W5 W6
Tests Added Tests Removed
6
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
Satisfaction Rating from Developers and Testers
0
17.5
35.0
52.5
70.0
June 6th June 13th June 20th June 27th July 4th July 11th July 18th
Devs Testers
Weekly
%
7
Copyright © 2011, Industrial Logic, Inc. All Rights Reserved.
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