DecisionOldOldTreeBuilderTest.mockTreeTest is flaky

[flakycov]

DecisionOldOldTreeBuilderTest.mockTreeTest fails for us on commit 2b348d5 but did not fail on the corresponding run on Travis.

Our tool confirms this test to be flaky. The stack trace is below. We set up our build environment to be as close as possible to your Travis build environment, using Ubuntu 12.04.5 LTS, Java 1.7.0_76 and Maven 3.3.9.

Tests run: 106, Failures: 1, Errors: 0, Skipped: 6, Time elapsed: 104.695 sec <<< FAILURE! - in TestSuite
mockTreeTest on mockTreeTest(quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest)(quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest)  Time elapsed: 5.922 sec  <<< FAILURE!
java.lang.AssertionError: attribute: ecp.  branch.getProbabilityOfTrueChild(): 0.9
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest$Conditions.satisfiesBranchConditions(DecisionOldOldTreeBuilderTest.java:159)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest$Conditions.satisfiesConditions(DecisionOldOldTreeBuilderTest.java:152)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest.recurseTree(DecisionOldOldTreeBuilderTest.java:127)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest.recurseTree(DecisionOldOldTreeBuilderTest.java:130)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest.recurseTree(DecisionOldOldTreeBuilderTest.java:130)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest.recurseTree(DecisionOldOldTreeBuilderTest.java:129)
	at quickml.supervised.tree.decisionTree.DecisionOldOldTreeBuilderTest.mockTreeTest(DecisionOldOldTreeBuilderTest.java:91)