[java code coverage] The red/green coverage bar of Jacoco report isn’t shown correctly

[minna hu]

I use maven-antrun-plugin and org.jacoco.ant.ReportTask to parse multiple
execution data files, read source codes from multiple projects and then
generate a consolidated jacoco report.

But the jacoco report is not presented as expected, the red/green bar
showing code coverage is not consistent with the code coverage percentage.
I met several misleading situations, such as

1. Some package with instruction coverage < 100% is shown as all green
2. Some package don’t have a bar showing coverage
3. Some package with instruction coverage > 0% is shown as all red

Please check the report snapshot. For company security regulations, I took
off the package name from the report. Any idea how to make the red/green
coverage bar more accurate? Thank you~
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[Marc R. Hoffmann]

Hi,

somebody (you?) asked the same question before in the tracker:
https://github.com/jacoco/jacoco/issues/176

The answer was: The bars give a rough visual feedback about instruction
coverage.

1. If the percentage is nearly 100% you might not see a red part any more.
2. The lengths of the bars represent the total size of instructions in
this group. So e.g. a very small package in comparison to the other
packages will not show up at all.
3. See 1)

Best regards,
-marc

Post by minna hu
I use maven-antrun-plugin and org.jacoco.ant.ReportTask to parse
multiple execution data files, read source codes from multiple
projects and then generate a consolidated jacoco report.
But the jacoco report is not presented as expected, the red/green bar
showing code coverage is not consistent with the code coverage
percentage. I met several misleading situations, such as
1. Some package with instruction coverage < 100% is shown as all green
2. Some package don’t have a bar showing coverage
3. Some package with instruction coverage > 0% is shown as all red
Please check the report snapshot. For company security regulations, I
took off the package name from the report. Any idea how to make the
red/green coverage bar more accurate? Thank you~