expressionPostAggregator = new ExpressionPostAggregator("add", "roku + rows", null, TestExprMacroTable.INSTANCE); Assert.assertEquals(9.0, arithmeticPostAggregator.compute(metricValues)); Assert.assertEquals(9.0, expressionPostAggregator.compute(metricValues)); Assert.assertEquals(3.0, expressionPostAggregator.compute(metricValues)); Assert.assertEquals(18.0, expressionPostAggregator.compute(metricValues)); Assert.assertEquals(2.0, expressionPostAggregator.compute(metricValues));