How to give System property to my test via Gradle and -D

The -P flag is for gradle properties, and the -D flag is for JVM properties. Because the test may be forked in a new JVM, the -D argument passed to gradle will not be propagated to the test – it sounds like that is the behavior you are seeing.

You can use the systemProperty in your test block as you have done but base it on the incoming gradle property by passing it with it -P:

test {
    systemProperty "cassandra.ip", project.getProperty("cassandra.ip")
}

or alternatively, if you are passing it in via -D

test {
    systemProperty "cassandra.ip", System.getProperty("cassandra.ip")
}

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