Analyze Coverage Data Using A Script
This example shows how to load, parse, and query coverage data using a script.
Load Coverage Data
Load the model, then use the helper script
setupCoverage. This script creates a simulation scenario with coverage enabled. Use this to simulate the model and generate a
Simulink.SimulationOutput object that contains coverage results.
load_system('slvnvdemo_ratelim_harness'); setupCoverage simOut = sim(covSet); covData = simOut.covData;
Extract Information from Coverage Data Objects
Retrieve coverage information from a block path or block handle by using
decisioninfo. The output is a vector with the achieved and total outcomes for a single model object.
subsysCov = decisioninfo(covData,... 'slvnvdemo_ratelim_harness/Adjustable Rate Limiter')
subsysCov = 5 6
Determine the percentage coverage achieved by using
percentCov = 100 * (subsysCov(1)/subsysCov(2))
percentCov = 83.3333
Specify that you want to extract the decision coverage data for the switch block called Apply Limited Gain by using
decisioninfo. This returns a structure which contains the decisions and outcomes.
[blockCov,desc] = decisioninfo(covData, ... ['slvnvdemo_ratelim_harness/Adjustable Rate Limiter'... '/Apply limited gain']); descDecision = desc.decision; outcome1 = desc.decision.outcome(1) outcome2 = desc.decision.outcome(2)
outcome1 = struct with fields: text: 'false (out = in3)' executionCount: 0 executedIn:  isFiltered: 0 isJustified: 0 filterRationale: '' outcome2 = struct with fields: text: 'true (out = in1)' executionCount: 101 executedIn:  isFiltered: 0 isJustified: 0 filterRationale: ''
decisioninfo output, you can see that the switch block called Apply Limited Gain was never false because the false case
executionCount field has a value of
0. If this behavior is expected, and you did not intend to execute this case with your tests, you can add a filter rule to justify this missing coverage using the
First, query for the block instance to be filtered, because we only need to filter the one block instance that received incomplete coverage, and not all instances of that block type. Then use the
slcoverage.BlockSelector class with the
BlockInstance selector type to designate one block instance for filtering.
id = getSimulinkBlockHandle( ... 'slvnvdemo_ratelim_harness/Adjustable Rate Limiter/Apply limited gain'); sel = slcoverage.BlockSelector( ... slcoverage.BlockSelectorType.BlockInstance,id);
filt = slcoverage.Filter; rule = slcoverage.FilterRule( ... sel,'Edge case',slcoverage.FilterMode.Justify);
Add the rule to the filter using the
addRule method. Then save the new filter file with the
To apply the filter to the coverage data, set the
filter property of the
cvdata object to the name of the filter file. Use
decisioninfo on the filtered coverage data to see that there is now 100% decision coverage because the justified objectives are counted as satisfied.
covData.filter = 'blfilter'; newCov = decisioninfo(covData,... 'slvnvdemo_ratelim_harness/Adjustable Rate Limiter') percentNewCov = 100 * (newCov(1)/newCov(2))
newCov = 6 6 percentNewCov = 100