Gradle: How to get output from test STDERR/STDOUT into console? - testing

Question

(Gradle 3.2.1) I run some java tests, which logs output in Stderr/Stdout. I can see that output, if I start
gradle test --info
but in that case, much of unwanted output from 3-rd party libraries is there too.
Documentation suggests using logging.caputureStandardError / logging.caputureStandardError (loglevel), but it doesn't seem to have any effect.
tasks.withType(Test) {
logging.captureStandardOutput LogLevel.QUIET
logging.captureStandardError LogLevel.QUIET
}
Then if running gradle test, not STDERR/STDOUT is output in console.
How can I get just the output from the tests classes in console?

Answer 1

Add these lines to build.gradle :
apply plugin: 'java'
test {
dependsOn cleanTest
testLogging.showStandardStreams = true
}
Notice: dependsOn cleanTest is not necessary but if not used, you need to run cleanTest or clean task before test task.
Edit:
A better approach:
apply plugin: 'java'
test {
testLogging {
outputs.upToDateWhen {false}
showStandardStreams = true
}
}
Notice: outputs.upToDateWhen {false} is not necessary but if not used, you need to run cleanTest or clean task before test task.
For more info and options see the documentation.

Answer 2

For those using Kotlin/Kotlin DSL for Gradle, you need to put the following in your build.gradle.kts file:
tasks.withType<Test> {
this.testLogging {
this.showStandardStreams = true
}
}
Also as mentioned in another answer, you will need to run gradle clean test for the output to print every time.

Answer 3

The testLogging answer is correct. For me, since I already had a tasks.test section, I figured it'd be easier to put it there instead.
tasks.test {
useJUnitPlatform()
this.testLogging {
this.showStandardStreams = true
}
}

Answer 4

Extending on #Talha Malik solution's above (and the ones in this other post), when dealing with a multi-module android app the following can be used (root build.gradle)
// Call from root build.gradle
setupTestLogging()
fun Project.setupTestLogging() {
for (sub in subprojects) {
sub.tasks.withType<Test> {
testLogging {
exceptionFormat = TestExceptionFormat.FULL
}
}
}
}
(note that while exceptionFormat alone should be enough to get the wanted outcome, the events("standardOut" ...) mentioned above can be specified in the same way)