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: pattern_test.go
    path of file: ./repos/minicron/client/vendor/golang.org/x/text/search
    
    the code of the file until where you have to start completion: // Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package search

import (
	"reflect"
	"strings"
	"testing"

	"golang.org/x/text/language"
)

func TestCompile(t *testing.T) {
	for i, tc := range []struct {
		desc    string
		pattern string
		options []Option
		n       int
	}{{
		desc:    "empty",
		pattern: "",
		n:       0,
	}, {
		desc:    "single",
		pattern: "a",
		n:       1,
	}, {
		desc:    "keep modifier",
		pattern: "a\u0300", // U+0300: COMBINING GRAVE ACCENT
		n:       2,
	}, {
		desc:    "remove modifier",
		pattern: "a\u0300", // U+0300: COMBINING GRAVE ACCENT
		options: []Option{IgnoreDiacritics},
		n:       1,
	}, {
		desc:    "single with double collation element",
		pattern: "ä",
		n:       2,
	}, {
		desc:    "leading variable",
		pattern: " a",
		n:       2,
	}, {
		desc:    "trailing variable",
		pattern: "aa ",
		n:       3,
	}, {
		desc:    "leading and trailing variable",
		pattern: " äb ",
		n:       5,
	}, {
		desc:    "keep interior variable",
		pattern: " ä b ",
		n:       6,
	}, {
		desc:    "keep interior variables",
		pattern: " b  ä ",
		n:       7,
	}, {
		desc:    "remove ignoreables (zero-weights across the board)",
		pattern: "\u009Db\u009Dä\u009D", // U+009D: OPERATING SYSTEM COMMAND
		n:       3,
	}} {
		m := New(language.Und, tc.options...)
		p := m.CompileString(tc.pattern)
		if len(p.ce) != tc.n {
			t.Errorf("%d:%s: Compile(%+q): got %d; want %d", i, tc.desc, tc.pattern, len(p.ce), tc.n)
		}
	}
}

func TestNorm(t *testing.T) {
	// U+0300: COMBINING GRAVE ACCENT (CCC=230)
	// U+031B: COMBINING HORN (CCC=216)
	for _, tc := range []struct {
		desc string
		a    string
		b    string
		want bool // a and b compile into the same pattern?
	}{{
		"simple",
		"eee\u0300\u031b",
		"eee\u031b\u0300",
		true,
	}, {
		"large number of modifiers in pattern",
		strings.Repeat("\u0300", 29) + "\u0318",
		"\u0318" + strings.Repeat("\u0300", 29),
		true,
	}, {
		"modifier overflow in pattern",
		strings.Repeat("\u0300", 30) + "\u0318",
		"\u0318" + strings.Repeat("\u0300", 30),
		false,
	}} {
		m := New(language.Und)
		a := m.CompileString(tc.a)
		b := m.CompileString(tc.b)
		if got := reflect.DeepEqual(a, b); got != tc.want {
			t.Errorf("Compile(a) == Compile(b) == %v; want %v", got, tc.want)
		}
	}
}

func TestForwardSearch(t *testing.T) {
	for i, tc := range []struct {
		desc    string
		tag     string
		options []Option
		pattern string
		text    string
		want    []int
	}{{
		// The semantics of an empty search is to match nothing.
		// TODO: change this to be in line with strings.Index? It is quite a
		// different beast, so not sure yet.

		desc:    "empty pattern and text",
		tag:     "und",
		pattern: "",
		text:    "",
		want:    nil, // TODO: consider: []int{0, 0},
	}, {
		desc:    "non-empty pattern and empty text",
		tag:     "und",
		pattern: " ",
		text:    "",
		want:    nil,
	}, {
		desc:    "empty pattern and non-empty text",
		tag:     "und",
		pattern: "",
		text:    "abc",
		want:    nil, // TODO: consider: []int{0, 0, 1, 1, 2, 2, 3, 3},
	}, {
		// Variable-only patterns. We don't support variables at the moment,
		// but verify that, given this, the behavior is indeed as expected.

		desc:    "exact match of variable",
		tag:     "und",
		pattern: " ",
		text:    " ",
		want:    []int{0, 1},
	}, {
		desc:    "variables not handled by default",
		tag:     "und",
		pattern: "- ",
		text:    " -",
		want:    nil, // Would be (1, 2) for a median match with variable}.
	}, {
		desc:    "multiple subsequent identical variables",
		tag:     "und",
		pattern: " ",
		text:    "    ",
		want:    []int{0, 1, 1, 2, 2, 3, 3, 4},
	}, {
		desc:    "text with variables",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "abc",
		text:    "3 abc 3",
		want:    []int{2, 5},
	}, {
		desc:    "pattern with interior variables",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "a b c",
		text:    "3 a b c abc a  b  c 3",
		want:    []int{2, 7}, // Would have 3 matches using variable.

		// TODO: Different variable handling settings.
	}, {
		// Options.

		desc:    "match all levels",
		tag:     "und",
		pattern: "Abc",
		text:    "abcAbcABCÁbcábc",
		want:    []int{3, 6},
	}, {
		desc:    "ignore diacritics in text",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Abc",
		text:    "Ábc",
		want:    []int{0, 4},
	}, {
		desc:    "ignore diacritics in pattern",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Ábc",
		text:    "Abc",
		want:    []int{0, 3},
	}, {
		desc:    "ignore diacritics",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Abc",
		text:    "abcAbcABCÁb
    
func TestForwardSearch(t *testing.T) {
	for i, tc := range []struct {
		desc    string
		tag     string
		options []Option
		pattern string
		text    string
		want    []int
	}{{
		// The semantics of an empty search is to match nothing.
		// TODO: change this to be in line with strings.Index? It is quite a
		// different beast, so not sure yet.

		desc:    "empty pattern and text",
		tag:     "und",
		pattern: "",
		text:    "",
		want:    nil, // TODO: consider: []int{0, 0},
	}, {
		desc:    "non-empty pattern and empty text",
		tag:     "und",
		pattern: " ",
		text:    "",
		want:    nil,
	}, {
		desc:    "empty pattern and non-empty text",
		tag:     "und",
		pattern: "",
		text:    "abc",
		want:    nil, // TODO: consider: []int{0, 0, 1, 1, 2, 2, 3, 3},
	}, {
		// Variable-only patterns. We don't support variables at the moment,
		// but verify that, given this, the behavior is indeed as expected.

		desc:    "exact match of variable",
		tag:     "und",
		pattern: " ",
		text:    " ",
		want:    []int{0, 1},
	}, {
		desc:    "variables not handled by default",
		tag:     "und",
		pattern: "- ",
		text:    " -",
		want:    nil, // Would be (1, 2) for a median match with variable}.
	}, {
		desc:    "multiple subsequent identical variables",
		tag:     "und",
		pattern: " ",
		text:    "    ",
		want:    []int{0, 1, 1, 2, 2, 3, 3, 4},
	}, {
		desc:    "text with variables",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "abc",
		text:    "3 abc 3",
		want:    []int{2, 5},
	}, {
		desc:    "pattern with interior variables",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "a b c",
		text:    "3 a b c abc a  b  c 3",
		want:    []int{2, 7}, // Would have 3 matches using variable.

		// TODO: Different variable handling settings.
	}, {
		// Options.

		desc:    "match all levels",
		tag:     "und",
		pattern: "Abc",
		text:    "abcAbcABCÁbcábc",
		want:    []int{3, 6},
	}, {
		desc:    "ignore diacritics in text",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Abc",
		text:    "Ábc",
		want:    []int{0, 4},
	}, {
		desc:    "ignore diacritics in pattern",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Ábc",
		text:    "Abc",
		want:    []int{0, 3},
	}, {
		desc:    "ignore diacritics",
		tag:     "und",
		options: []Option{IgnoreDiacritics},
		pattern: "Abc",
		text:    "abcAbcABCÁbcábc",
		want:    []int{3, 6, 9, 13},
	}, {
		desc:    "ignore case",
		tag:     "und",
		options: []Option{IgnoreCase},
		pattern: "Abc",
		text:    "abcAbcABCÁbcábc",
		want:    []int{0, 3, 3, 6, 6, 9},
	}, {
		desc:    "ignore case and diacritics",
		tag:     "und",
		options: []Option{IgnoreCase, IgnoreDiacritics},
		pattern: "Abc",
		text:    "abcAbcABCÁbcábc",
		want:    []int{0, 3, 3, 6, 6, 9, 9, 13, 13, 17},
	}, {
		desc:    "ignore width to fullwidth",
		tag:     "und",
		options: []Option{IgnoreWidth},
		pattern: "abc",
		text:    "123 \uFF41\uFF42\uFF43 123", // U+FF41-3: FULLWIDTH LATIN SMALL LETTER A-C
		want:    []int{4, 13},
	}, {
		// TODO: distinguish between case and width.
		desc:    "don't ignore width to fullwidth, ignoring only case",
		tag:     "und",
		options: []Option{IgnoreCase},
		pattern: "abc",
		text:    "123 \uFF41\uFF42\uFF43 123", // U+FF41-3: FULLWIDTH LATIN SMALL LETTER A-C
		want:    []int{4, 13},
	}, {
		desc:    "ignore width to fullwidth and diacritics",
		tag:     "und",
		options: []Option{IgnoreWidth, IgnoreDiacritics},
		pattern: "abc",
		text:    "123 \uFF41\uFF42\uFF43 123", // U+FF41-3: FULLWIDTH LATIN SMALL LETTER A-C
		want:    []int{4, 13},
	}, {
		desc:    "whole grapheme, single rune",
		tag:     "und",
		pattern: "eee",
		text:    "123 eeé 123",
		want:    nil,
	}, {
		// Note: rules on when to apply contractions may, for certain languages,
		// differ between search and collation. For example, "ch" is not
		// considered a contraction for the purpose of searching in Spanish.
		// Therefore, be careful picking this test.
		desc:    "whole grapheme, contractions",
		tag:     "da",
		pattern: "aba",
		// Fails at the primary level, because "aa" is a contraction.
		text: "123 abaa 123",
		want: []int{},
	}, {
		desc:    "whole grapheme, trailing modifier",
		tag:     "und",
		pattern: "eee",
		text:    "123 eee\u0300 123", // U+0300: COMBINING GRAVE ACCENT
		want:    nil,
	}, {
		// Language-specific matching.

		desc:    "",
		tag:     "da",
		options: []Option{IgnoreCase},
		pattern: "Århus",
		text:    "AarhusÅrhus  Århus  ",
		want:    []int{0, 6, 6, 12, 14, 20},
	}, {
		desc:    "",
		tag:     "da",
		options: []Option{IgnoreCase},
		pattern: "Aarhus",
		text:    "Århus Aarhus",
		want:    []int{0, 6, 7, 13},
	}, {
		desc:    "",
		tag:     "en", // Å does not match A for English.
		options: []Option{IgnoreCase},
		pattern: "Aarhus",
		text:    "Århus",
		want:    nil,
	}, {
		desc:    "ignore modifier in text",
		options: []Option{IgnoreDiacritics},
		tag:     "und",
		pattern: "eee",
		text:    "123 eee\u0300 123", // U+0300: COMBINING GRAVE ACCENT
		want:    []int{4, 9},         // Matches on grapheme boundary.
	}, {
		desc:    "ignore multiple modifiers in text",
		options: []Option{IgnoreDiacritics},
		tag:     "und",
		pattern: "eee",
		text:    "123 eee\u0300\u0300 123", // U+0300: COMBINING GRAVE ACCENT
		want:    []int{4, 11},              // Matches on grapheme boundary.
	}, {
		desc:    "ignore modifier in pattern",
		options: []Option{IgnoreDiacritics},
		tag:     "und",
		pattern: "eee\u0300", // U+0300: COMBINING GRAVE ACCENT
		text:    "123 eee 123",
		want:    []int{4, 7},
	}, {
		desc:    "ignore multiple modifiers in pattern",
		options: []Option{IgnoreDiacritics},
		tag:     "und",
		pattern: "eee\u0300\u0300", // U+0300: COMBINING GRAVE ACCENT
		text:    "123 eee 123",
		want:    []int{4, 7},
	}, {
		desc: "match non-normalized pattern",
		tag:  "und",
		// U+0300: COMBINING GRAVE ACCENT (CCC=230)
		// U+031B: COMBINING HORN (CCC=216)
		pattern: "eee\u0300\u031b",
		text:    "123 eee\u031b\u0300 123",
		want:    []int{4, 11},
	}, {
		desc: "match non-normalized text",
		tag:  "und",
		// U+0300: COMBINING GRAVE ACCENT (CCC=230)
		// U+031B: COMBINING HORN (CCC=216)
		pattern: "eee\u031b\u0300",
		text:    "123 eee\u0300\u031b 123",
		want:    []int{4, 11},
	}} {
		m := New(language.MustParse(tc.tag), tc.options...)
		p := m.CompileString(tc.pattern)
		for j := 0; j < len(tc.text); {
			start, end := p.IndexString(tc.text[j:])
			if start == -1 && end == -1 {
				j++
				continue
			}
			start += j
			end += j
			j = end
			if len(tc.want) == 0 {
				t.Errorf("%d:%s: found unexpected result [%d %d]", i, tc.desc, start, end)
				break
			}
			if tc.want[0] != start || tc.want[1] != end {
				t.Errorf("%d:%s: got [%d %d]; want %v", i, tc.desc, start, end, tc.want[:2])
				tc.want = tc.want[2:]
				break
			}
			tc.want = tc.want[2:]
		}
		if len(tc.want) != 0 {
			t.Errorf("%d:%s: %d extra results", i, tc.desc, len(tc.want)/2)
		}
	}