t.Fatalf("expect 4 abcd but got %s. r.w=%d, r.r=%d", rb.Bytes(nil), rb.w, rb.r)
	}

	// check empty or full
	if rb.IsEmpty() {
		t.Fatalf("expect IsEmpty is false but got true")
	}
	if rb.IsFull() {
		t.Fatalf("expect IsFull is false but got true")
	}

	// write 48 bytes, should full
	n, err = rb.Write([]byte(strings.Repeat("abcd", 12)))
	if err != nil {

				Message:  "Access Denied.",
			},
			shouldPass: false,
		},
		// GET wrong credentials
		{
			method: http.MethodGet, bucketName: bucketName,
			accessKey:          "abcd",
			secretKey:          "abcd",
			expectedRespStatus: http.StatusForbidden,
			lifecycleResponse:  []byte(""),
			errorResponse: APIErrorResponse{
				Resource: SlashSeparator + bucketName + SlashSeparator,

			errorResponse: APIErrorResponse{},
			shouldPass:    true,
		},
		// Test case - 2.
		// Tests for signature mismatch error.
		{
			bucketName:         bucketName,
			accessKey:          "abcd",
			secretKey:          "abcd",
			expectedRespStatus: http.StatusForbidden,
			locationResponse:   []byte(""),
			errorResponse: APIErrorResponse{
				Resource: SlashSeparator + bucketName + SlashSeparator,

# Usage

```go
package main

import (
	"fmt"

	"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

		},
		{
			name: "Empty",
			args: args{ports: []string{}},
			want: []string{},
		},
		{
			name: "Non-parseable",
			args: args{ports: []string{"abcd", "2345", "abcd"}},
			want: []string{"abcd", "2345"},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := dedupPorts(tt.args.ports); !reflect.DeepEqual(got, tt.want) {

		t.Error("DeadlineWriter shouldn't be successful - should return context.DeadlineExceeded")
	}
	w.Close()
	w = NewDeadlineWriter(&sleepWriter{timeout: 100 * time.Millisecond}, 600*time.Millisecond)
	n, err := w.Write([]byte("abcd"))
	w.Close()
	if err != nil {
		t.Errorf("DeadlineWriter should succeed but failed with %s", err)
	}
	if n != 4 {

		// Creating sequence of parts for same uploadID.
		{bucketName, objectName, uploadIDs[0], 1, "abcd", "e2fc714c4727ee9395f324cd2e7f331f", int64(len("abcd"))},
		{bucketName, objectName, uploadIDs[0], 2, "efgh", "1f7690ebdd9b4caf8fab49ca1757bf27", int64(len("efgh"))},
		{bucketName, objectName, uploadIDs[0], 3, "ijkl", "09a0877d04abf8759f99adec02baf579", int64(len("abcd"))},

			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{4, "abcd"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testReadFrom{fileOps{"ab", int64(3), "cd"}, 7, io.ErrUnexpectedEOF},
			testRemaining{1, 0},
		},
	}, {
		maker: makeSparse{makeReg{4, "abcd"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testReadFrom{fileOps{"ab", int64(3), "cde"}, 7, errMissData},

			"192.168.0.0/-16",
			nil,
		},
		{
			"invalid ip address",
			"19216800",
			nil,
		},
		{
			"valid ipv6 address",
			"2001:abcd:85a3::8a2e:370:1234",
			&core.CidrRange{
				AddressPrefix: "2001:abcd:85a3::8a2e:370:1234",
				PrefixLen:     &wrappers.UInt32Value{Value: 128},
			},
		},
		{
			"success case with no PrefixLen",
			"1.2.3.4",
			&core.CidrRange{

        assertOrder(X_GT_Y, "1.0m.1", "1.0");
        assertOrder(X_GT_Y, "1.0m-1", "1.0");
    }

    @Test
    void testUnknownQualifierOrdering() {
        assertOrder(X_LT_Y, "1-abc", "1-abcd");
        assertOrder(X_LT_Y, "1-abc", "1-bcd");
        assertOrder(X_GT_Y, "1-abc", "1-aac");
    }

    @Test
    void testCaseInsensitiveOrderingOfQualifiers() {