Comparable c2 = newComparable(v2);
        assertEquals(0, c1.compareTo(c2), "expected " + v1 + " == " + v2);
        assertEquals(0, c2.compareTo(c1), "expected " + v2 + " == " + v1);
        assertEquals(c1.hashCode(), c2.hashCode(), "expected same hashcode for " + v1 + " and " + v2);
        assertEquals(c1, c2, "expected " + v1 + ".equals( " + v2 + " )");
        assertEquals(c2, c1, "expected " + v2 + ".equals( " + v1 + " )");

     *
     * @param c1 first signature to compare
     * @param c2 second signature to compare
     * @return MORE_SPECIFIC if c1 is more specific than c2, LESS_SPECIFIC if
     *         c1 is less specific than c2, INCOMPARABLE if they are incomparable.
     */
    private static int moreSpecific(Class<?>[] c1, Class<?>[] c2) {
        boolean c1MoreSpecific = false;
        boolean c2MoreSpecific = false;

    CharSource c1 = CharSource.wrap("abc");
    CharSource c2 = CharSource.wrap("");
    CharSource c3 = CharSource.wrap("de");

    String expected = "abcde";

    assertEquals(expected, CharSource.concat(ImmutableList.of(c1, c2, c3)).read());
    assertEquals(expected, CharSource.concat(c1, c2, c3).read());
    assertEquals(expected, CharSource.concat(ImmutableList.of(c1, c2, c3).iterator()).read());

        VersionConstraint c = versionParser.parseVersionConstraint("[1.0]");
        assertEquals("[1.0,1.0]", c.toString());
        VersionConstraint c2 = versionParser.parseVersionConstraint(c.toString());
        assertEquals(c, c2);
        assertTrue(c.contains(versionParser.parseVersion("1.0")));
    }

        ArtifactSpec a = createArtifactSpec("a", "1.0");
        ArtifactSpec b = a.addDependency("b", "1.0");
        ArtifactSpec c2 = b.addDependency("c", "2.0");
        c2.addDependency("d", "1.0");

        ArtifactSpec e = createArtifactSpec("e", "1.0");
        ArtifactSpec c1 = e.addDependency("c", "1.0");
        ArtifactSpec f = c1.addDependency("f", "1.0");

                        .getArtifactId());
        assertEquals(
                "c2",
                ((Artifact) ReflectionValueExtractor.evaluate("project.artifactMap(g2:a2:c2)", project))
                        .getClassifier());
    }

    public static class Artifact {
        private String groupId;

        assertThrows(IllegalArgumentException.class, () -> cli.calculateDegreeOfConcurrency("C2.2C"));
        assertThrows(IllegalArgumentException.class, () -> cli.calculateDegreeOfConcurrency("C2.2"));
        assertThrows(IllegalArgumentException.class, () -> cli.calculateDegreeOfConcurrency("2C2"));

    FluentIterable<String> tail = FluentIterable.from(list).skip(1);
    Iterator<String> tailIterator = tail.iterator();
    list.set(2, "c2");
    assertEquals("b", tailIterator.next());
    assertEquals("c2", tailIterator.next());
    assertFalse(tailIterator.hasNext());
  }

  public void testSkip_structurallyModifiedSkipSome() throws Exception {

    }

    private static boolean equals(String s1, String s2) {
        String c1 = s1 == null ? "" : s1.trim();
        String c2 = s2 == null ? "" : s2.trim();
        return c1.equals(c2);
    }

    private static Severity getSeverity(ModelBuildingRequest request, int errorThreshold) {
        return getSeverity(request.getValidationLevel(), errorThreshold);
    }