The following issues were found

src/test/java/io/reactivex/rxjava3/tck/SwitchMapDelayErrorTckTest.java
1 issues
Potential violation of Law of Demeter (method chain calls)
Design

Line: 28 

                  @Override
    public Publisher<Long> createPublisher(long elements) {
        return
            Flowable.just(1).switchMapDelayError(Functions.justFunction(
                    Flowable.fromIterable(iterate(elements)))
            )
        ;
    }
}

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/SingleFlatMapFlowableTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.functions.Function;

@Test
public class SingleFlatMapFlowableTckTest extends BaseTck<Integer> {

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/SequenceEqualTckTest.java
1 issues
Potential violation of Law of Demeter (method chain calls)
Design

Line: 27 

                  @Override
    public Publisher<Boolean> createPublisher(final long elements) {
        return
                Flowable.sequenceEqual(
                        Flowable.range(1, 1000),
                        Flowable.range(1, 1001))
                .toFlowable()
            ;
    }

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/RepeatTckTest.java
1 issues
Potential violation of Law of Demeter (method chain calls)
Design

Line: 26 

              
    @Override
    public Publisher<Integer> createPublisher(long elements) {
        return Flowable.just(1).repeat(elements);
    }
}

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/MaybeFlatMapPublisherTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.functions.Function;

@Test
public class MaybeFlatMapPublisherTckTest extends BaseTck<Integer> {

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/IntervalRangeTckTest.java
1 issues
Potential violation of Law of Demeter (method chain calls)
Design

Line: 29 

                  @Override
    public Publisher<Long> createPublisher(long elements) {
        return
            Flowable.intervalRange(0, elements, 0, 1, TimeUnit.MILLISECONDS)
            .onBackpressureBuffer()
        ;
    }
}

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/CreateTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;

@Test
public class CreateTckTest extends BaseTck<Long> {

    @Override

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/ConcatWithSingleTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;

@Test
public class ConcatWithSingleTckTest extends BaseTck<Integer> {

    @Override

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/ConcatWithMaybeTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;

@Test
public class ConcatWithMaybeTckTest extends BaseTck<Integer> {

    @Override

Reported by PMD.

src/test/java/io/reactivex/rxjava3/tck/ConcatWithMaybeEmptyTckTest.java
1 issues
Avoid unused imports such as 'io.reactivex.rxjava3.core'
Design

Line: 19 

              import org.reactivestreams.Publisher;
import org.testng.annotations.Test;

import io.reactivex.rxjava3.core.*;

@Test
public class ConcatWithMaybeEmptyTckTest extends BaseTck<Integer> {

    @Override

Reported by PMD.