and:
        union.matchesUniqueVersion() == members.every { it.matchesUniqueVersion() }

        and:
        union.canShortCircuitWhenVersionAlreadyPreselected() == members.every { it.canShortCircuitWhenVersionAlreadyPreselected() }

        where:
        selectors << [
            ['1.0'],
            ['1.0', '1.1'],
            ['1.0', '1+'],
            ['1.0', 'latest.release'],

    }

    @Override
    public boolean accept(ComponentMetadata candidate) {
        return accept(candidate.getId().getVersion());
    }

    @Override
    public boolean canShortCircuitWhenVersionAlreadyPreselected() {
        return true;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

                return true;
            }
        }
        return false;
    }

    @Override
    public boolean canShortCircuitWhenVersionAlreadyPreselected() {
        for (VersionSelector selector : selectors) {
            if (!selector.canShortCircuitWhenVersionAlreadyPreselected()) {
                return false;
            }
        }
        return true;
    }

    @Override

        return false;
    }

    @Override
    public boolean accept(String candidate) {
        return candidate.startsWith(prefix);
    }

    @Override
    public boolean canShortCircuitWhenVersionAlreadyPreselected() {
        return false;
    }

        return selectorStatusIndex >=0 && selectorStatusIndex <= candidateStatusIndex;
    }

    @Override
    public boolean canShortCircuitWhenVersionAlreadyPreselected() {
        return false;
    }

        return !versionSelector.accept(candidate);
    }

    @Override
    public boolean matchesUniqueVersion() {
        return false;
    }

    @Override
    public boolean canShortCircuitWhenVersionAlreadyPreselected() {
        return false;
    }

     * pre-selected version.
     *
     * @return true if this selector can short-circuit
     */
    boolean canShortCircuitWhenVersionAlreadyPreselected();

    /**
     * Returns this selector as a string.
     *
     * @return a stringy representation of this selector
     */
    String getSelector();

    }

    private static boolean canBeStable(VersionSelector vs) {
        if (vs == null) {
            return true;
        }
        return vs.canShortCircuitWhenVersionAlreadyPreselected();
    }

    private boolean doComputeIsDynamic() {
        if (requiredVersionSelector != null) {
            return requiredVersionSelector.isDynamic();
        }

        }
        VersionSelector versionSelector = versionConstraint.getRequiredSelector();
        if (versionSelector != null &&
            (candidateIsFromLock || versionSelector.canShortCircuitWhenVersionAlreadyPreselected())) {

            if (candidateIsFromLock && versionSelector instanceof LatestVersionSelector) {
                // Always assume a candidate from a lock will satisfy the latest version selector