Tuesday 15 September 2015

Read Maven Surefire Test Result files using Perl

When you want something quick and dirty it doesn't get dirtier, or quicker, than Perl.

We have four thousand tests and they are taking way too long. To discover why we need to sort the tests by how long they take to run and see if a pattern emerges. The test runtimes are written to the target/surefire-reports directory. Each file is named for the class of the test file and contains information in the following format:

Test set: com.mycorp.MyTest
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.03 sec

#! /usr/bin/perl -wall

my %tests;
open(RESULTS, "grep 'Tests run' target/surefire-reports/*.txt|"); 
while () { 
  s/Tests run:.+Time elapsed://;
  s/ sec//;
  $tests{$1} = $2; 

my $cumulative = 0.0;
foreach my $key (sort {$tests{$a} <=> $tests{$b}} keys %tests) {
  $cumulative += $tests{$key};
    ($cumulative/60)%60, $cumulative%60, 
    ($tests{$key}/60)%60, $tests{$key}%60,

The resultant CSV can be viewed using a google chart:

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