// different start alignments
		b1 := b[i:]
		for j := 0; j < len(b1); j++ {
			b1[j] = 'x'
			pos := IndexByte(b1, 'x')
			if pos != j {
				t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
			}
			b1[j] = 0
			pos = IndexByte(b1, 'x')
			if pos != -1 {
				t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
			}
		}
		// different end alignments
		b1 = b[:i]
		for j := 0; j < len(b1); j++ {

		//           b1
		//         0/ \1
		//        b2   b3
		// Traverse b.Succs in order, the right child node b3 will be scheduled immediately after
		// b1, traverse b.Succs in reverse order, the left child node b2 will be scheduled
		// immediately after b1. The test results show that reverse traversal performs a little
		// better.

func averageDeltaBound(m0, m1 image.Image, b0, b1 image.Rectangle) int64 {
	var sum, n int64
	for y := b0.Min.Y; y < b0.Max.Y; y++ {
		for x := b0.Min.X; x < b0.Max.X; x++ {
			c0 := m0.At(x, y)
			c1 := m1.At(x-b0.Min.X+b1.Min.X, y-b0.Min.Y+b1.Min.Y)
			r0, g0, b0, _ := c0.RGBA()
			r1, g1, b1, _ := c1.RGBA()
			sum += delta(r0, r1)
			sum += delta(g0, g1)
			sum += delta(b0, b1)
			n += 3
		}
	}
	return sum / n
}

    private static final String GROUP_ID = "test";

    // fields -----------------------------------------------------------------

    protected Artifact a1;

    protected Artifact a2;

    protected Artifact b1;

    private final String roleHint;

    @Inject
    private ArtifactFactory artifactFactory;

    private ConflictResolver conflictResolver;

    @Inject
    protected PlexusContainer container;

        "123"             | "123"       | false
        "abc"             | "abc"       | false
        "a.b.c.1.2"       | "a.b.c.1.2" | false
        "1b2.1.2.3"       | "1"         | true
        "b1-2-3.3"        | "b"         | true
    }

    def "handles empty parts and retains whitespace"() {
        expect:
        def version = parse(versionStr)
        version.parts as List == parts

        where:

000000a0  92 17 03 03 02 6d 2a 26  5c 45 13 5f 75 46 56 41  |.....m*&\E._uFVA|
000000b0  25 92 a1 6f cd 7b 01 e2  cb 76 81 4d 33 f0 9d d1  |%..o.{...v.M3...|
000000c0  0d db b1 90 1a a7 d9 a8  4a 79 b1 12 59 62 0d c8  |........Jy..Yb..|
000000d0  cc 92 16 26 27 3e 07 b6  8a 15 77 a8 f6 c3 02 e7  |...&'>....w.....|
000000e0  44 0d b5 d3 11 57 6b 81  15 7d 23 b3 91 82 21 3c  |D....Wk..}#...!<|

        empty.add(other1).add(other2).addAll([listener, listener]).remove(listener).removeAll([other1, other2]).empty

        // Add existing
        def b1 = empty.add(listener)
        b1.add(listener).is(b1)
        b1.addAll([listener, listener]).is(b1)
        def b2 = empty.add(other1).add(listener)
        b2.add(listener).is(b2)
        b2.addAll([listener, listener]).is(b2)
    }

00000330  04 9d 14 03 03 00 01 01  16 03 03 00 40 85 14 34  |............@..4|
00000340  d6 74 a9 d0 0b e9 1f 34  a9 e9 6c cf 5a ac 88 22  |.t.....4..l.Z.."|
00000350  51 4d ae 16 05 dd 9e c1  36 5e e3 cf b1 5a b5 48  |QM......6^...Z.H|
00000360  6c 24 b1 d6 fb 7f 03 6a  98 41 90 de 6d c7 b2 49  |l$.....j.A..m..I|
00000370  d9 a3 c7 45 ff 18 7c f7  a4 cf 05 59 87           |...E..|....Y.|
>>> Flow 4 (server to client)

00000080  00 03 02 03 04 00 2d 00  02 01 01 00 33 00 26 00  |......-.....3.&.|
00000090  24 00 1d 00 20 6e 42 98  d4 04 32 d1 21 0f 64 c9  |$... nB...2.!.d.|
000000a0  b7 f2 b2 52 6f 2b b7 b1  95 4b 57 85 7b 69 d9 63  |...Ro+...KW.{i.c|
000000b0  19 48 d2 1c 1e                                    |.H...|
>>> Flow 2 (server to client)

00000240  df d3 20 64 38 92 24 3a  00 bc cf 9c 7d b7 40 20  |.. d8.$:....}.@ |
00000250  01 5f aa d3 16 61 09 a2  76 fd 13 c3 cc e1 0c 5c  |._...a..v......\|
00000260  ee b1 87 82 f1 6c 04 ed  73 bb b3 43 77 8d 0c 1c  |.....l..s..Cw...|
00000270  f1 0f a1 d8 40 83 61 c9  4c 72 2b 9d ae db 46 06  |******@****.***+...F.|
00000280  06 4d f4 c1 b3 3e c0 d1  bd 42 d4 db fe 3d 13 60  |.M...>...B...=.`|