What is the correct way to check the test coverage of an android library?

Question

What is the correct way to check the test coverage of an android library?

1k Views Asked by otiasj At 04 April 2025 at 21:23

My main project is an android library. I have created a test project with some unit test in it. the tests run fine, but I am struggling to get the test coverage. When I generate the coverage report, I only get the coverage of the tests cases, but not of the library. So it gives me almost 100% because 100% of the test are running. but that doesn't help me to tell what part of the library has been tested.

This is how I do it at the moment :

0) my project looks like this:
myLibraryProject        <- this is my android library project
myLibraryProject/tests  <- this is my android test project

1) build.xml file : (from myLibraryProject/tests directory)
>android update test-project --path . -m ../

2) Modify the ant.properties file :
#tested.project.dir=../
android.library.reference.1=..

3) only then can I run :
ant emma debug install test

if I don't do step 2) then step 3) fails because the library project can not be installed

Any help would really be appreciated!

Original Q&A

There are 1 best solutions below

**otiasj** · Accepted Answer

So here is the solution I found:

Create a new build.xml in your test project copy the "test" target from android sdk build.xml file (I have used sdk20 preview 2 version)

modify the sourcepath to point at the library project in the report section

this is the one I use now :

 <!-- version-tag: custom -->
 <target name="test" depends="-test-project-check"
            description="Runs tests from the package defined in test.package property">
    <property name="test.runner" value="android.test.InstrumentationTestRunner" />

    <if condition="${project.is.test}">
    <then>
        <property name="tested.project.absolute.dir" location="${tested.project.dir}" />

        <!-- Application package of the tested project extracted from its manifest file -->
        <xpath input="${tested.project.absolute.dir}/AndroidManifest.xml"
                expression="/manifest/@package" output="tested.project.app.package" />
    </then>
    <else>
        <!-- this is a test app, the tested package is the app's own package -->
        <property name="tested.project.app.package" value="${project.app.package}" />
    </else>
    </if>

    <property name="emma.dump.file" value="/data/data/${tested.project.app.package}/coverage.ec" /> 

    <if condition="${emma.enabled}">
        <then>
            <echo>WARNING: Code Coverage is currently only supported on the emulator and rooted devices.</echo>
            <run-tests-helper emma.enabled="true">
                <extra-instrument-args>
                    <arg value="-e" />
                       <arg value="coverageFile" />
                       <arg value="${emma.dump.file}" />
                </extra-instrument-args>
            </run-tests-helper>
            <echo level="info">Downloading coverage file into project directory...</echo>
            <exec executable="${adb}" failonerror="true">
                <arg line="${adb.device.arg}" />
                <arg value="pull" />
                <arg value="${emma.dump.file}" />
                <arg value="coverage.ec" />
            </exec>
            <echo level="info">Extracting coverage report...</echo>
            <emma>
                <report sourcepath="../${source.dir}" verbosity="${verbosity}">
                    <sourcepath>
                      <dirset dir="${basedir}" >
                        <include name="../src" /> 
                        </dirset>
                    </sourcepath>
                    <infileset dir=".">
                        <include name="coverage.ec" />
                        <include name="coverage.em" />
                    </infileset>
                    <html outfile="coverage.html" />
                    <xml outfile="coverage/coverage.xml" />
               </report>
            </emma>
            <echo level="info">Cleaning up temporary files...</echo>
            <delete file="coverage.ec" />
            <delete file="coverage.em" />
            <echo level="info">Saving the report file in ${basedir}/coverage/coverage.html and ${basedir}/coverage/coverage.xml</echo>
        </then>
        <else>
            <run-tests-helper />
        </else>
    </if>
</target>

What is the correct way to check the test coverage of an android library?

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