Kotlin Generated Code Mutation Survival

[SkittishSloth]

When running against kotlin code, I'm getting a lot of false survivals of removed call to kotlin/jvm/internal/Intrinsics::checkExpressionValueIsNotNull → SURVIVED. I'm assuming this is code that's generated by the kotlin compiler for non-nullable types; I'm seeing it in lots of places, and I'm definitely not calling it anywhere directly.

Kinda related, on an interpolated String (i.e. "Hello $name"), I'm getting a removed call to java/lang/StringBuilder::toString → SURVIVED. I'm early in writing tests for this project, so this might go away when I've actually written coverage for it, but it's a little confusing at first. Not as big a problem as the null check.

If I add the Intrinsics class to the avoidCallsTo configuration, both of these goes away BUT I lose a lot of other potentially useful mutations too. (And the StringBuilder one is pretty useful too, assuming it kills when I've added the appropriate tests.) I've tried explicitly adding the method to avoidCalls, tried adding it to excludedMethods, no joy. I didn't expect adding it to avoidCalls to work, I believe that's class level, and I might've been using some wrong syntax for excludedMethods.

Any ideas?

[hcoles]

The fix for this would be the kotlin plugin

https://github.com/pitest/pitest-kotlin

However it is looking for someone to develop and maintain it.

[SkittishSloth]

Oh wow - I wasn't aware of that. I'll definitely check it out. Is there any list of plugins like this? I don't recall seeing anything on the site, I might've just missed it though.

…

On 3:27AM, Fri, Feb 15, 2019 Henry Coles ***@***.*** wrote: The fix for this would be the kotlin plugin https://github.com/pitest/pitest-kotlin However it is looking for someone to develop and maintain it. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#569 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGPf8J2CfldPRLu0_HhSKveZ67NpA0hcks5vNouWgaJpZM4a84OO> .

[JoaoGFarias]

@hcoles Any hope to it be published, even without active maintenance? pitest/pitest-kotlin#3

[z5y]

I solved the problem by using avoidCallsTo in the configuration. I use maven in this project, but something similar can be done with gradle as well:

 <plugin>
        <groupId>org.pitest</groupId>
        <artifactId>pitest-maven</artifactId>
        <version>1.5.2</version>
        <dependencies>
          <dependency>
            <groupId>org.pitest</groupId>
            <artifactId>pitest-junit5-plugin</artifactId>
            <version>0.12</version>
          </dependency>
        </dependencies>
        <configuration>
          <!-- targetClass and targetTests here -->
          <avoidCallsTo>
            <avoidCallsTo>kotlin.jvm.internal</avoidCallsTo>
            <avoidCallsTo>kotlinx.coroutines</avoidCallsTo>
          </avoidCallsTo>
        </configuration>
      </plugin>

[hcoles]

Kotlin support is now available at https://docs.arcmutate.com/docs/kotlin.html