You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: display_test.go
    path of file: ./repos/buildkit/util/progress/progressui
    
    the code of the file until where you have to start completion: package progressui

import (
	"testing"
	"time"

	"github.com/stretchr/testify/require"
)

func mkinterval(start, stop int64) interval {
	unixStart := time.Unix(start, 0)
	unixStop := time.Unix(stop, 0)
	return interval{start: &unixStart, stop: &unixStop}
}

func mkOpenInterval(start int64) interval {
	unixStart := time.Unix(start, 0)
	return interval{start: &unixStart, stop: nil}
}

func TestMergeIntervals(t *testing.T) {
	for _, tc := range []struct {
		name     string
		input    []interval
		expected []interval
	}{
		{
			name:     "none",
			input:    nil,
			expected: nil,
		},
		{
			name: "one",
			input: []interval{
				mkinterval(0, 1),
			},
			expected: []interval{
				mkinterval(0, 1),
			},
		},
		{
			name: "unstarted",
			input: []interval{
				mkinterval(0, 1),
				{nil, nil},
			},
			expected: []interval{
				mkinterval(0, 1),
			},
		},
		{
			name: "equal",
			input: []interval{
				mkinterval(2, 4),
				mkinterval(2, 4),
			},
			expected: []interval{
				mkinterval(2, 4),
			},
		},
		{
			name: "no overlap",
			input: []interval{
				mkinterval(0, 1),
				mkinterval(2, 3),
				mkinterval(7, 8),
			},
			expected: []interval{
				mkinterval(0, 1),
				mkinterval(2, 3),
				mkinterval(7, 8),
			},
		},
		{
			name: "subsumed",
			input: []interval{
				mkinterval(0, 10),
				mkinterval(1, 2),
				mkinterval(4, 9),
				mkinterval(9, 10),
			},
			expected: []interval{
				mkinterval(0, 10),
			},
		},
		{
			name: "partial overlaps",
			input: []interval{
				mkinterval(0, 3),
				mkinterval(2, 5),
				mkinterval(4, 8),
				mkinterval(10, 12),
				mkinterval(11, 14),
			},
			expected: []interval{
				mkinterval(0, 8),
				mkinterval(10, 14),
			},
		},
		{
			name: "joined",
			input: []interval{
				mkinterval(0, 2),
				mkinterval(2, 4),
				mkinterval(4, 6),
				mkinterval(8, 10),
				mkinterval(10, 12),
				mkinterval(11, 12),
				mkinterval(11, 14),
			},
			expected: []inter
    
func TestMergeIntervals(t *testing.T) {
	for _, tc := range []struct {
		name     string
		input    []interval
		expected []interval
	}{
		{
			name:     "none",
			input:    nil,
			expected: nil,
		},
		{
			name: "one",
			input: []interval{
				mkinterval(0, 1),
			},
			expected: []interval{
				mkinterval(0, 1),
			},
		},
		{
			name: "unstarted",
			input: []interval{
				mkinterval(0, 1),
				{nil, nil},
			},
			expected: []interval{
				mkinterval(0, 1),
			},
		},
		{
			name: "equal",
			input: []interval{
				mkinterval(2, 4),
				mkinterval(2, 4),
			},
			expected: []interval{
				mkinterval(2, 4),
			},
		},
		{
			name: "no overlap",
			input: []interval{
				mkinterval(0, 1),
				mkinterval(2, 3),
				mkinterval(7, 8),
			},
			expected: []interval{
				mkinterval(0, 1),
				mkinterval(2, 3),
				mkinterval(7, 8),
			},
		},
		{
			name: "subsumed",
			input: []interval{
				mkinterval(0, 10),
				mkinterval(1, 2),
				mkinterval(4, 9),
				mkinterval(9, 10),
			},
			expected: []interval{
				mkinterval(0, 10),
			},
		},
		{
			name: "partial overlaps",
			input: []interval{
				mkinterval(0, 3),
				mkinterval(2, 5),
				mkinterval(4, 8),
				mkinterval(10, 12),
				mkinterval(11, 14),
			},
			expected: []interval{
				mkinterval(0, 8),
				mkinterval(10, 14),
			},
		},
		{
			name: "joined",
			input: []interval{
				mkinterval(0, 2),
				mkinterval(2, 4),
				mkinterval(4, 6),
				mkinterval(8, 10),
				mkinterval(10, 12),
				mkinterval(11, 12),
				mkinterval(11, 14),
			},
			expected: []interval{
				mkinterval(0, 6),
				mkinterval(8, 14),
			},
		},
		{
			name: "open interval",
			input: []interval{
				mkinterval(0, 5),
				mkOpenInterval(6),
			},
			expected: []interval{
				mkinterval(0, 5),
				mkOpenInterval(6),
			},
		},
		{
			name: "open interval with overlaps",
			input: []interval{
				mkOpenInterval(1),
				mkinterval(3, 5),
			},
			expected: []interval{
				mkOpenInterval(1),
			},
		},
		{
			name: "complex",
			input: []interval{
				mkinterval(0, 2),
				mkinterval(1, 4),
				mkinterval(1, 4),
				mkinterval(1, 5),
				{nil, nil},
				mkinterval(6, 20),
				mkinterval(8, 10),
				mkinterval(8, 10),
				mkinterval(9, 10),
				mkinterval(12, 14),
				mkinterval(19, 21),
				mkinterval(30, 31),
				mkinterval(32, 35),
				{nil, nil},
				mkOpenInterval(33),
			},
			expected: []interval{
				mkinterval(0, 5),
				mkinterval(6, 21),
				mkinterval(30, 31),
				mkOpenInterval(32),
			},
		},
	} {
		t.Run(tc.name, func(t *testing.T) {
			require.Equal(t, tc.expected, mergeIntervals(tc.input))
		})
	}
}