EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License.It brings code coverage analysis directly into the Eclipse workbench: Fast develop/test cycle: Launches from within the workbench like JUnit test runs can directly be analyzed for code coverage. Rich coverage analysis: Coverage results are immediately summarized and highlighted in the. Methods-Jacoco provides details of all solid (implemented) method. It counts the number of methods in the scope. Classes-Jacoco provides details of each class(if one of its methods is executed). Jacoco also considers constructors as static initializers as methods. It counts the number of classes in the scope.
Full name:
org.jacoco:jacoco-maven-plugin:0.8.7-SNAPSHOT:check
Description:
Attributes:
- Requires a Maven project to be executed.
- Since version:
0.6.1. - Binds by default to the lifecycle phase:
verify.
Required Parameters
| Name | Type | Since | Description |
| boolean | 0.6.1 | Halt the build if any of the checks fail. Default value is: true.User property is: jacoco.haltOnFailure. |
| List | 0.6.1 | Check configuration used to specify rules on element types(BUNDLE, PACKAGE, CLASS, SOURCEFILE or METHOD) with a list oflimits. Each limit applies to a certain counter (INSTRUCTION, LINE,BRANCH, COMPLEXITY, METHOD, CLASS) and defines a minimum or maximumfor the corresponding value (TOTALCOUNT, COVEREDCOUNT, MISSEDCOUNT,COVEREDRATIO, MISSEDRATIO). If a limit refers to a ratio it must bein the range from 0.0 to 1.0 where the number of decimal placeswill also determine the precision in error messages. A limit ratiomay optionally be declared as a percentage where 0.80 and 80%represent the same value. If not specified the following defaults are assumed:
This example requires an overall instruction coverage of 80% andno class must be missed: This example requires a line coverage minimum of 50% for everyclass except test classes: |
Optional Parameters
| Name | Type | Since | Description |
| File | 0.6.1 | File with execution data. Default value is: ${project.build.directory}/jacoco.exec. |
| List | 0.6.1 | A list of class files to exclude from analysis. May use wildcardcharacters (* and ?). When not specified nothing will be excluded. |
| List | 0.6.1 | A list of class files to include into analysis. May use wildcardcharacters (* and ?). When not specified everything will beincluded. |
| boolean | 0.6.1 | Flag used to suppress execution. Default value is: false.User property is: jacoco.skip. |
Parameter Details
- Type:
java.io.File - Since:
0.6.1 - Required:
No - Default:
${project.build.directory}/jacoco.exec
- Type:
java.util.List - Since:
0.6.1 - Required:
No
- Type:
boolean - Since:
0.6.1 - Required:
Yes - User Property:
jacoco.haltOnFailure - Default:
true
- Type:
java.util.List - Since:
0.6.1 - Required:
No
Check configuration used to specify rules on element types(BUNDLE, PACKAGE, CLASS, SOURCEFILE or METHOD) with a list oflimits. Each limit applies to a certain counter (INSTRUCTION, LINE,BRANCH, COMPLEXITY, METHOD, CLASS) and defines a minimum or maximumfor the corresponding value (TOTALCOUNT, COVEREDCOUNT, MISSEDCOUNT,COVEREDRATIO, MISSEDRATIO). If a limit refers to a ratio it must bein the range from 0.0 to 1.0 where the number of decimal placeswill also determine the precision in error messages. A limit ratiomay optionally be declared as a percentage where 0.80 and 80%represent the same value.
If not specified the following defaults are assumed:
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- rule element: BUNDLE
- limit counter: INSTRUCTION
- limit value: COVEREDRATIO
This example requires an overall instruction coverage of 80% andno class must be missed:
This example requires a line coverage minimum of 50% for everyclass except test classes:
- Type:
java.util.List - Since:
0.6.1 - Required:
Yes
- rule element: BUNDLE
- limit counter: INSTRUCTION
- limit value: COVEREDRATIO
This example requires an overall instruction coverage of 80% andno class must be missed:
This example requires a line coverage minimum of 50% for everyclass except test classes:
- Type:
java.util.List - Since:
0.6.1 - Required:
Yes
- Type:
boolean - Since:
0.6.1 - Required:
No - User Property:
jacoco.skip - Default:
false
Code coverage is a measure of how much of your code executes when the automated tests run. Depending on how effectively your tests are written, it can provide a good picture of how much you are testing your code. JaCoCo, one of the many others, is a popular tool that enables developers to quantify this metric for a Java application.
In this post, we'll integrate JaCoCo with a Spring Boot application. We'll also generate a coverage report that can be viewed in a browser.
The examples in this post use
- Java 11
- Spring Boot 2.1.8
- JaCoCo 0.8.4
Let's reuse the Spring Boot application created in the post Uploading files with Spring Boot and Angular.
Setup JaCoCo
تحميل كتاب traveller 5 pdf. Add the JaCoCo plugin in pom.xml with the following configuration.
Jacoco runs the coverage by instrumenting the Java code through an agent. The first execution start-agent starts this agent (called JaCoCo Agent). The second execution generate-report generates the report.
Execute mvn package or mvn test command to see this in action. After the build, you'll notice a jacoco.exec file in the target directory. We can open this file in an IDE to see the results of coverage.
Your editor may even show the coverage in the project window itself.
Note These screenshots are from IntelliJ Idea; other editors/IDEs may display coverage information differently.
Configure JaCoCo
JaCoCo provides a fair amount of flexibility when it comes to configuration.
When the mvn jacoco:report task fires up, it generates reports in HTML, CSV and XML formats in a directory target/site/jacoco. We can use those files to integrate with a static analysis tool (like SonarQube) or publish the HTML report for other people to view.
Note The appearance of the report may vary depending on your browser preferences.
We've already seen how we can configure the title of the report using the title key. We can also configure the encoding, footer text, etc and explicitly exclude or include class files. For a comprehensive list of options, refer to jacoco:report documentation.
Enforce coverage compliance
In a typical scenario, we may require a project to have certain coverage. If the tests fail to pass that threshold, the build should fail. To enforce such a policy, we can configure custom rules built around limits which are specified over a counter. Counters are used by JaCoCo to calculate different coverage metrics.
Consider the following configuration.
We have specified a coverage rule to be applied to the entire application with an instruction coverage of 80% using the INSTRUCTION counter. The instruction coverage provides information about the amount of code that has been executed or missed, irrespective of how the source code has been formatted. Similarly, a class coverage (which we have specified using the CLASS counter) tells that at least one method of a class has been executed. These rules will apply over the entire application because we've used a BUNDLE element.
We can configure specific classes and additional counters as well to customize the coverage rules. For more details on how this can be done, refer to the official documentation.
References
Jacoco Exclude Inner Class
Source Code — coverage-with-jacoco
Jacoco Excludefromcodecoverage
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