trait ApproximationAssertion[-T] extends AnyRef
Trait for unit testing approximation outputs with an error rate(in percentage).
A simple test might look like this:
import com.spotify.scio.testing.PipelineSpec import com.spotify.scio.testing.ApproximationAssertions._ class ApproximatePipelineTest extends PipelineSpec { "An approximate pipeline" should "in range with error percentage" in { val input: Seq[Int] = ... val estimator = ZetaSketchHllPlusPlus[Int](20) // with precision 20 val output: Seq[Long] = runWithData(input) { sCol => sCol.countApproxDistinct(estimator) } output shouldApproximate withErrorRate(Seq(3L), 0.5d) } it should "works with key-valued output" in { val in: Seq[(String, Int)] = ... val expected: Seq[(String, Long)] = ... val estimator = ZetaSketchHllPlusPlus[Int]() // with default precision val output = runWithData(in) { scl => scl .countApproxDistinctByKey(estimator) } output shouldApproximate withErrorRatePerKey(expected, 0.5d) } }
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