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;

    assertUnescaped(e, '_');
    assertUnescaped(e, '.');
    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000

    assertUnescaped(e, '_');
    assertUnescaped(e, '.');
    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000

        assertEscaping(e, escapeAscii(c), c);
      }
    }

    // Testing multibyte escape sequences
    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000

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