This spec passes when it shouldn't. The mockRunnable is never called.

gistfile1.java

package com.vlc;

import static com.googlecode.instinct.expect.Expect.expect;
import com.googlecode.instinct.integrate.junit4.InstinctRunner;
import com.googlecode.instinct.marker.annotate.Specification;
import org.jmock.Expectations;
import org.junit.runner.RunWith;

@RunWith(InstinctRunner.class)
public final class InstinctFailContext {
    private Runnable mockRunnable;

    @Specification(expectedException = IllegalArgumentException.class)
    public void shouldReportNicerFailsInIntellij() {
        expect.that(new Expectations() {
            {
                one(mockRunnable).run();
            }
        });
        new Thing().foo();

    }

    private static final class Thing {
        public void foo() {
            throw new IllegalArgumentException("HERE");
        }
    }
}