android/util_test.go - LeafOS-Project/android_build_soong - Gitiles

 // Copyright 2017 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package android

 import (
 	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
 	"testing"
 )

 var firstUniqueStringsTestCases = []struct {
 	in  []string
 	out []string
 }{
 	{
 		in:  []string{"a"},
 		out: []string{"a"},
 	},
 	{
 		in:  []string{"a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"a", "a"},
 		out: []string{"a"},
 	},
 	{
 		in:  []string{"a", "b", "a"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"b", "a", "a"},
 		out: []string{"b", "a"},
 	},
 	{
 		in:  []string{"a", "a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"a", "b", "a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"liblog", "libdl", "libc++", "libdl", "libc", "libm"},
 		out: []string{"liblog", "libdl", "libc++", "libc", "libm"},
 	},
 }

 func TestFirstUniqueStrings(t *testing.T) {
 	f := func(t *testing.T, imp func([]string) []string, in, want []string) {
 		t.Helper()
 		out := imp(in)
 		if !reflect.DeepEqual(out, want) {
 			t.Errorf("incorrect output:")
 			t.Errorf("     input: %#v", in)
 			t.Errorf("  expected: %#v", want)
 			t.Errorf("       got: %#v", out)
 		}
 	}

 	for _, testCase := range firstUniqueStringsTestCases {
 		t.Run("list", func(t *testing.T) {
 			f(t, firstUniqueStringsList, testCase.in, testCase.out)
 		})
 		t.Run("map", func(t *testing.T) {
 			f(t, firstUniqueStringsMap, testCase.in, testCase.out)
 		})
 	}
 }

 var lastUniqueStringsTestCases = []struct {
 	in  []string
 	out []string
 }{
 	{
 		in:  []string{"a"},
 		out: []string{"a"},
 	},
 	{
 		in:  []string{"a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"a", "a"},
 		out: []string{"a"},
 	},
 	{
 		in:  []string{"a", "b", "a"},
 		out: []string{"b", "a"},
 	},
 	{
 		in:  []string{"b", "a", "a"},
 		out: []string{"b", "a"},
 	},
 	{
 		in:  []string{"a", "a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"a", "b", "a", "b"},
 		out: []string{"a", "b"},
 	},
 	{
 		in:  []string{"liblog", "libdl", "libc++", "libdl", "libc", "libm"},
 		out: []string{"liblog", "libc++", "libdl", "libc", "libm"},
 	},
 }

 func TestLastUniqueStrings(t *testing.T) {
 	for _, testCase := range lastUniqueStringsTestCases {
 		out := LastUniqueStrings(testCase.in)
 		if !reflect.DeepEqual(out, testCase.out) {
 			t.Errorf("incorrect output:")
 			t.Errorf("     input: %#v", testCase.in)
 			t.Errorf("  expected: %#v", testCase.out)
 			t.Errorf("       got: %#v", out)
 		}
 	}
 }

 func TestJoinWithPrefix(t *testing.T) {
 	testcases := []struct {
 		name     string
 		input    []string
 		expected string
 	}{
 		{
 			name:     "zero_inputs",
 			input:    []string{},
 			expected: "",
 		},
 		{
 			name:     "one_input",
 			input:    []string{"a"},
 			expected: "prefix:a",
 		},
 		{
 			name:     "two_inputs",
 			input:    []string{"a", "b"},
 			expected: "prefix:a prefix:b",
 		},
 	}

 	prefix := "prefix:"

 	for _, testCase := range testcases {
 		t.Run(testCase.name, func(t *testing.T) {
 			out := JoinWithPrefix(testCase.input, prefix)
 			if out != testCase.expected {
 				t.Errorf("incorrect output:")
 				t.Errorf("     input: %#v", testCase.input)
 				t.Errorf("    prefix: %#v", prefix)
 				t.Errorf("  expected: %#v", testCase.expected)
 				t.Errorf("       got: %#v", out)
 			}
 		})
 	}
 }

 func TestIndexList(t *testing.T) {
 	input := []string{"a", "b", "c"}

 	testcases := []struct {
 		key      string
 		expected int
 	}{
 		{
 			key:      "a",
 			expected: 0,
 		},
 		{
 			key:      "b",
 			expected: 1,
 		},
 		{
 			key:      "c",
 			expected: 2,
 		},
 		{
 			key:      "X",
 			expected: -1,
 		},
 	}

 	for _, testCase := range testcases {
 		t.Run(testCase.key, func(t *testing.T) {
 			out := IndexList(testCase.key, input)
 			if out != testCase.expected {
 				t.Errorf("incorrect output:")
 				t.Errorf("       key: %#v", testCase.key)
 				t.Errorf("     input: %#v", input)
 				t.Errorf("  expected: %#v", testCase.expected)
 				t.Errorf("       got: %#v", out)
 			}
 		})
 	}
 }

 func TestInList(t *testing.T) {
 	input := []string{"a"}

 	testcases := []struct {
 		key      string
 		expected bool
 	}{
 		{
 			key:      "a",
 			expected: true,
 		},
 		{
 			key:      "X",
 			expected: false,
 		},
 	}

 	for _, testCase := range testcases {
 		t.Run(testCase.key, func(t *testing.T) {
 			out := InList(testCase.key, input)
 			if out != testCase.expected {
 				t.Errorf("incorrect output:")
 				t.Errorf("       key: %#v", testCase.key)
 				t.Errorf("     input: %#v", input)
 				t.Errorf("  expected: %#v", testCase.expected)
 				t.Errorf("       got: %#v", out)
 			}
 		})
 	}
 }

 func TestPrefixInList(t *testing.T) {
 	prefixes := []string{"a", "b"}

 	testcases := []struct {
 		str      string
 		expected bool
 	}{
 		{
 			str:      "a-example",
 			expected: true,
 		},
 		{
 			str:      "b-example",
 			expected: true,
 		},
 		{
 			str:      "X-example",
 			expected: false,
 		},
 	}

 	for _, testCase := range testcases {
 		t.Run(testCase.str, func(t *testing.T) {
 			out := HasAnyPrefix(testCase.str, prefixes)
 			if out != testCase.expected {
 				t.Errorf("incorrect output:")
 				t.Errorf("       str: %#v", testCase.str)
 				t.Errorf("  prefixes: %#v", prefixes)
 				t.Errorf("  expected: %#v", testCase.expected)
 				t.Errorf("       got: %#v", out)
 			}
 		})
 	}
 }

 func TestFilterList(t *testing.T) {
 	input := []string{"a", "b", "c", "c", "b", "d", "a"}
 	filter := []string{"a", "c"}
 	remainder, filtered := FilterList(input, filter)

 	expected := []string{"b", "b", "d"}
 	if !reflect.DeepEqual(remainder, expected) {
 		t.Errorf("incorrect remainder output:")
 		t.Errorf("     input: %#v", input)
 		t.Errorf("    filter: %#v", filter)
 		t.Errorf("  expected: %#v", expected)
 		t.Errorf("       got: %#v", remainder)
 	}

 	expected = []string{"a", "c", "c", "a"}
 	if !reflect.DeepEqual(filtered, expected) {
 		t.Errorf("incorrect filtered output:")
 		t.Errorf("     input: %#v", input)
 		t.Errorf("    filter: %#v", filter)
 		t.Errorf("  expected: %#v", expected)
 		t.Errorf("       got: %#v", filtered)
 	}
 }

 func TestFilterListPred(t *testing.T) {
 	pred := func(s string) bool { return strings.HasPrefix(s, "a/") }
 	AssertArrayString(t, "filter", FilterListPred([]string{"a/c", "b/a", "a/b"}, pred), []string{"a/c", "a/b"})
 	AssertArrayString(t, "filter", FilterListPred([]string{"b/c", "a/a", "b/b"}, pred), []string{"a/a"})
 	AssertArrayString(t, "filter", FilterListPred([]string{"c/c", "b/a", "c/b"}, pred), []string{})
 	AssertArrayString(t, "filter", FilterListPred([]string{"a/c", "a/a", "a/b"}, pred), []string{"a/c", "a/a", "a/b"})
 }

 func TestRemoveListFromList(t *testing.T) {
 	input := []string{"a", "b", "c", "d", "a", "c", "d"}
 	filter := []string{"a", "c"}
 	expected := []string{"b", "d", "d"}
 	out := RemoveListFromList(input, filter)
 	if !reflect.DeepEqual(out, expected) {
 		t.Errorf("incorrect output:")
 		t.Errorf("     input: %#v", input)
 		t.Errorf("    filter: %#v", filter)
 		t.Errorf("  expected: %#v", expected)
 		t.Errorf("       got: %#v", out)
 	}
 }

 func TestRemoveFromList(t *testing.T) {
 	testcases := []struct {
 		name          string
 		key           string
 		input         []string
 		expectedFound bool
 		expectedOut   []string
 	}{
 		{
 			name:          "remove_one_match",
 			key:           "a",
 			input:         []string{"a", "b", "c"},
 			expectedFound: true,
 			expectedOut:   []string{"b", "c"},
 		},
 		{
 			name:          "remove_three_matches",
 			key:           "a",
 			input:         []string{"a", "b", "a", "c", "a"},
 			expectedFound: true,
 			expectedOut:   []string{"b", "c"},
 		},
 		{
 			name:          "remove_zero_matches",
 			key:           "X",
 			input:         []string{"a", "b", "a", "c", "a"},
 			expectedFound: false,
 			expectedOut:   []string{"a", "b", "a", "c", "a"},
 		},
 		{
 			name:          "remove_all_matches",
 			key:           "a",
 			input:         []string{"a", "a", "a", "a"},
 			expectedFound: true,
 			expectedOut:   []string{},
 		},
 	}

 	for _, testCase := range testcases {
 		t.Run(testCase.name, func(t *testing.T) {
 			found, out := RemoveFromList(testCase.key, testCase.input)
 			if found != testCase.expectedFound {
 				t.Errorf("incorrect output:")
 				t.Errorf("       key: %#v", testCase.key)
 				t.Errorf("     input: %#v", testCase.input)
 				t.Errorf("  expected: %#v", testCase.expectedFound)
 				t.Errorf("       got: %#v", found)
 			}
 			if !reflect.DeepEqual(out, testCase.expectedOut) {
 				t.Errorf("incorrect output:")
 				t.Errorf("       key: %#v", testCase.key)
 				t.Errorf("     input: %#v", testCase.input)
 				t.Errorf("  expected: %#v", testCase.expectedOut)
 				t.Errorf("       got: %#v", out)
 			}
 		})
 	}
 }

 func TestCopyOfEmptyAndNil(t *testing.T) {
 	emptyList := []string{}
 	copyOfEmptyList := CopyOf(emptyList)
 	AssertBoolEquals(t, "Copy of an empty list should be an empty list and not nil", true, copyOfEmptyList != nil)
 	copyOfNilList := CopyOf(nil)
 	AssertBoolEquals(t, "Copy of a nil list should be a nil list and not an empty list", true, copyOfNilList == nil)
 }

 func ExampleCopyOf() {
 	a := []string{"1", "2", "3"}
 	b := CopyOf(a)
 	a[0] = "-1"
 	fmt.Printf("a = %q\n", a)
 	fmt.Printf("b = %q\n", b)

 	// Output:
 	// a = ["-1" "2" "3"]
 	// b = ["1" "2" "3"]
 }

 func ExampleCopyOf_append() {
 	a := make([]string, 1, 2)
 	a[0] = "foo"

 	fmt.Println("Without CopyOf:")
 	b := append(a, "bar")
 	c := append(a, "baz")
 	fmt.Printf("a = %q\n", a)
 	fmt.Printf("b = %q\n", b)
 	fmt.Printf("c = %q\n", c)

 	a = make([]string, 1, 2)
 	a[0] = "foo"

 	fmt.Println("With CopyOf:")
 	b = append(CopyOf(a), "bar")
 	c = append(CopyOf(a), "baz")
 	fmt.Printf("a = %q\n", a)
 	fmt.Printf("b = %q\n", b)
 	fmt.Printf("c = %q\n", c)

 	// Output:
 	// Without CopyOf:
 	// a = ["foo"]
 	// b = ["foo" "baz"]
 	// c = ["foo" "baz"]
 	// With CopyOf:
 	// a = ["foo"]
 	// b = ["foo" "bar"]
 	// c = ["foo" "baz"]
 }

 func TestSplitFileExt(t *testing.T) {
 	t.Run("soname with version", func(t *testing.T) {
 		root, suffix, ext := SplitFileExt("libtest.so.1.0.30")
 		expected := "libtest"
 		if root != expected {
 			t.Errorf("root should be %q but got %q", expected, root)
 		}
 		expected = ".so.1.0.30"
 		if suffix != expected {
 			t.Errorf("suffix should be %q but got %q", expected, suffix)
 		}
 		expected = ".so"
 		if ext != expected {
 			t.Errorf("ext should be %q but got %q", expected, ext)
 		}
 	})

 	t.Run("soname with svn version", func(t *testing.T) {
 		root, suffix, ext := SplitFileExt("libtest.so.1svn")
 		expected := "libtest"
 		if root != expected {
 			t.Errorf("root should be %q but got %q", expected, root)
 		}
 		expected = ".so.1svn"
 		if suffix != expected {
 			t.Errorf("suffix should be %q but got %q", expected, suffix)
 		}
 		expected = ".so"
 		if ext != expected {
 			t.Errorf("ext should be %q but got %q", expected, ext)
 		}
 	})

 	t.Run("version numbers in the middle should be ignored", func(t *testing.T) {
 		root, suffix, ext := SplitFileExt("libtest.1.0.30.so")
 		expected := "libtest.1.0.30"
 		if root != expected {
 			t.Errorf("root should be %q but got %q", expected, root)
 		}
 		expected = ".so"
 		if suffix != expected {
 			t.Errorf("suffix should be %q but got %q", expected, suffix)
 		}
 		expected = ".so"
 		if ext != expected {
 			t.Errorf("ext should be %q but got %q", expected, ext)
 		}
 	})

 	t.Run("no known file extension", func(t *testing.T) {
 		root, suffix, ext := SplitFileExt("test.exe")
 		expected := "test"
 		if root != expected {
 			t.Errorf("root should be %q but got %q", expected, root)
 		}
 		expected = ".exe"
 		if suffix != expected {
 			t.Errorf("suffix should be %q but got %q", expected, suffix)
 		}
 		if ext != expected {
 			t.Errorf("ext should be %q but got %q", expected, ext)
 		}
 	})
 }

 func Test_Shard(t *testing.T) {
 	type args struct {
 		strings   []string
 		shardSize int
 	}
 	tests := []struct {
 		name string
 		args args
 		want [][]string
 	}{
 		{
 			name: "empty",
 			args: args{
 				strings:   nil,
 				shardSize: 1,
 			},
 			want: [][]string(nil),
 		},
 		{
 			name: "single shard",
 			args: args{
 				strings:   []string{"a", "b"},
 				shardSize: 2,
 			},
 			want: [][]string{{"a", "b"}},
 		},
 		{
 			name: "single short shard",
 			args: args{
 				strings:   []string{"a", "b"},
 				shardSize: 3,
 			},
 			want: [][]string{{"a", "b"}},
 		},
 		{
 			name: "shard per input",
 			args: args{
 				strings:   []string{"a", "b", "c"},
 				shardSize: 1,
 			},
 			want: [][]string{{"a"}, {"b"}, {"c"}},
 		},
 		{
 			name: "balanced shards",
 			args: args{
 				strings:   []string{"a", "b", "c", "d"},
 				shardSize: 2,
 			},
 			want: [][]string{{"a", "b"}, {"c", "d"}},
 		},
 		{
 			name: "unbalanced shards",
 			args: args{
 				strings:   []string{"a", "b", "c"},
 				shardSize: 2,
 			},
 			want: [][]string{{"a", "b"}, {"c"}},
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			t.Run("strings", func(t *testing.T) {
 				if got := ShardStrings(tt.args.strings, tt.args.shardSize); !reflect.DeepEqual(got, tt.want) {
 					t.Errorf("ShardStrings(%v, %v) = %v, want %v",
 						tt.args.strings, tt.args.shardSize, got, tt.want)
 				}
 			})

 			t.Run("paths", func(t *testing.T) {
 				stringsToPaths := func(strings []string) Paths {
 					if strings == nil {
 						return nil
 					}
 					paths := make(Paths, len(strings))
 					for i, s := range strings {
 						paths[i] = PathForTesting(s)
 					}
 					return paths
 				}

 				paths := stringsToPaths(tt.args.strings)

 				var want []Paths
 				if sWant := tt.want; sWant != nil {
 					want = make([]Paths, len(sWant))
 					for i, w := range sWant {
 						want[i] = stringsToPaths(w)
 					}
 				}

 				if got := ShardPaths(paths, tt.args.shardSize); !reflect.DeepEqual(got, want) {
 					t.Errorf("ShardPaths(%v, %v) = %v, want %v",
 						paths, tt.args.shardSize, got, want)
 				}
 			})
 		})
 	}
 }

 func BenchmarkFirstUniqueStrings(b *testing.B) {
 	implementations := []struct {
 		name string
 		f    func([]string) []string
 	}{
 		{
 			name: "list",
 			f:    firstUniqueStringsList,
 		},
 		{
 			name: "map",
 			f:    firstUniqueStringsMap,
 		},
 		{
 			name: "optimal",
 			f:    FirstUniqueStrings,
 		},
 	}
 	const maxSize = 1024
 	uniqueStrings := make([]string, maxSize)
 	for i := range uniqueStrings {
 		uniqueStrings[i] = strconv.Itoa(i)
 	}
 	sameString := make([]string, maxSize)
 	for i := range sameString {
 		sameString[i] = uniqueStrings[0]
 	}

 	f := func(b *testing.B, imp func([]string) []string, s []string) {
 		for i := 0; i < b.N; i++ {
 			b.ReportAllocs()
 			s = append([]string(nil), s...)
 			imp(s)
 		}
 	}

 	for n := 1; n <= maxSize; n <<= 1 {
 		b.Run(strconv.Itoa(n), func(b *testing.B) {
 			for _, implementation := range implementations {
 				b.Run(implementation.name, func(b *testing.B) {
 					b.Run("same", func(b *testing.B) {
 						f(b, implementation.f, sameString[:n])
 					})
 					b.Run("unique", func(b *testing.B) {
 						f(b, implementation.f, uniqueStrings[:n])
 					})
 				})
 			}
 		})
 	}
 }

 func testSortedKeysHelper[K Ordered, V any](t *testing.T, name string, input map[K]V, expected []K) {
 	t.Helper()
 	t.Run(name, func(t *testing.T) {
 		actual := SortedKeys(input)
 		if !reflect.DeepEqual(actual, expected) {
 			t.Errorf("expected %v, got %v", expected, actual)
 		}
 	})
 }

 func TestSortedKeys(t *testing.T) {
 	testSortedKeysHelper(t, "simple", map[string]string{
 		"b": "bar",
 		"a": "foo",
 	}, []string{
 		"a",
 		"b",
 	})
 	testSortedKeysHelper(t, "ints", map[int]interface{}{
 		10: nil,
 		5:  nil,
 	}, []int{
 		5,
 		10,
 	})

 	testSortedKeysHelper(t, "nil", map[string]string(nil), nil)
 	testSortedKeysHelper(t, "empty", map[string]string{}, nil)
 }

 func TestSortedStringValues(t *testing.T) {
 	testCases := []struct {
 		name     string
 		in       interface{}
 		expected []string
 	}{
 		{
 			name:     "nil",
 			in:       map[string]string(nil),
 			expected: nil,
 		},
 		{
 			name:     "empty",
 			in:       map[string]string{},
 			expected: nil,
 		},
 		{
 			name:     "simple",
 			in:       map[string]string{"foo": "a", "bar": "b"},
 			expected: []string{"a", "b"},
 		},
 		{
 			name:     "duplicates",
 			in:       map[string]string{"foo": "a", "bar": "b", "baz": "b"},
 			expected: []string{"a", "b", "b"},
 		},
 	}

 	for _, tt := range testCases {
 		t.Run(tt.name, func(t *testing.T) {
 			got := SortedStringValues(tt.in)
 			if g, w := got, tt.expected; !reflect.DeepEqual(g, w) {
 				t.Errorf("wanted %q, got %q", w, g)
 			}
 		})
 	}
 }

 func TestSortedUniqueStringValues(t *testing.T) {
 	testCases := []struct {
 		name     string
 		in       interface{}
 		expected []string
 	}{
 		{
 			name:     "nil",
 			in:       map[string]string(nil),
 			expected: nil,
 		},
 		{
 			name:     "empty",
 			in:       map[string]string{},
 			expected: nil,
 		},
 		{
 			name:     "simple",
 			in:       map[string]string{"foo": "a", "bar": "b"},
 			expected: []string{"a", "b"},
 		},
 		{
 			name:     "duplicates",
 			in:       map[string]string{"foo": "a", "bar": "b", "baz": "b"},
 			expected: []string{"a", "b"},
 		},
 	}

 	for _, tt := range testCases {
 		t.Run(tt.name, func(t *testing.T) {
 			got := SortedUniqueStringValues(tt.in)
 			if g, w := got, tt.expected; !reflect.DeepEqual(g, w) {
 				t.Errorf("wanted %q, got %q", w, g)
 			}
 		})
 	}
 }
	// Copyright 2017 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package android

	import (
	"fmt"
	"reflect"
	"strconv"
	"strings"
	"testing"
	)

	var firstUniqueStringsTestCases = []struct {
	in []string
	out []string
	}{
	{
	in: []string{"a"},
	out: []string{"a"},
	},
	{
	in: []string{"a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"a", "a"},
	out: []string{"a"},
	},
	{
	in: []string{"a", "b", "a"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"b", "a", "a"},
	out: []string{"b", "a"},
	},
	{
	in: []string{"a", "a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"a", "b", "a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"liblog", "libdl", "libc++", "libdl", "libc", "libm"},
	out: []string{"liblog", "libdl", "libc++", "libc", "libm"},
	},
	}

	func TestFirstUniqueStrings(t *testing.T) {
	f := func(t *testing.T, imp func([]string) []string, in, want []string) {
	t.Helper()
	out := imp(in)
	if !reflect.DeepEqual(out, want) {
	t.Errorf("incorrect output:")
	t.Errorf(" input: %#v", in)
	t.Errorf(" expected: %#v", want)
	t.Errorf(" got: %#v", out)
	}
	}

	for _, testCase := range firstUniqueStringsTestCases {
	t.Run("list", func(t *testing.T) {
	f(t, firstUniqueStringsList, testCase.in, testCase.out)
	})
	t.Run("map", func(t *testing.T) {
	f(t, firstUniqueStringsMap, testCase.in, testCase.out)
	})
	}
	}

	var lastUniqueStringsTestCases = []struct {
	in []string
	out []string
	}{
	{
	in: []string{"a"},
	out: []string{"a"},
	},
	{
	in: []string{"a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"a", "a"},
	out: []string{"a"},
	},
	{
	in: []string{"a", "b", "a"},
	out: []string{"b", "a"},
	},
	{
	in: []string{"b", "a", "a"},
	out: []string{"b", "a"},
	},
	{
	in: []string{"a", "a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"a", "b", "a", "b"},
	out: []string{"a", "b"},
	},
	{
	in: []string{"liblog", "libdl", "libc++", "libdl", "libc", "libm"},
	out: []string{"liblog", "libc++", "libdl", "libc", "libm"},
	},
	}

	func TestLastUniqueStrings(t *testing.T) {
	for _, testCase := range lastUniqueStringsTestCases {
	out := LastUniqueStrings(testCase.in)
	if !reflect.DeepEqual(out, testCase.out) {
	t.Errorf("incorrect output:")
	t.Errorf(" input: %#v", testCase.in)
	t.Errorf(" expected: %#v", testCase.out)
	t.Errorf(" got: %#v", out)
	}
	}
	}

	func TestJoinWithPrefix(t *testing.T) {
	testcases := []struct {
	name string
	input []string
	expected string
	}{
	{
	name: "zero_inputs",
	input: []string{},
	expected: "",
	},
	{
	name: "one_input",
	input: []string{"a"},
	expected: "prefix:a",
	},
	{
	name: "two_inputs",
	input: []string{"a", "b"},
	expected: "prefix:a prefix:b",
	},
	}

	prefix := "prefix:"

	for _, testCase := range testcases {
	t.Run(testCase.name, func(t *testing.T) {
	out := JoinWithPrefix(testCase.input, prefix)
	if out != testCase.expected {
	t.Errorf("incorrect output:")
	t.Errorf(" input: %#v", testCase.input)
	t.Errorf(" prefix: %#v", prefix)
	t.Errorf(" expected: %#v", testCase.expected)
	t.Errorf(" got: %#v", out)
	}
	})
	}
	}

	func TestIndexList(t *testing.T) {
	input := []string{"a", "b", "c"}

	testcases := []struct {
	key string
	expected int
	}{
	{
	key: "a",
	expected: 0,
	},
	{
	key: "b",
	expected: 1,
	},
	{
	key: "c",
	expected: 2,
	},
	{
	key: "X",
	expected: -1,
	},
	}

	for _, testCase := range testcases {
	t.Run(testCase.key, func(t *testing.T) {
	out := IndexList(testCase.key, input)
	if out != testCase.expected {
	t.Errorf("incorrect output:")
	t.Errorf(" key: %#v", testCase.key)
	t.Errorf(" input: %#v", input)
	t.Errorf(" expected: %#v", testCase.expected)
	t.Errorf(" got: %#v", out)
	}
	})
	}
	}

	func TestInList(t *testing.T) {
	input := []string{"a"}

	testcases := []struct {
	key string
	expected bool
	}{
	{
	key: "a",
	expected: true,
	},
	{
	key: "X",
	expected: false,
	},
	}

	for _, testCase := range testcases {
	t.Run(testCase.key, func(t *testing.T) {
	out := InList(testCase.key, input)
	if out != testCase.expected {
	t.Errorf("incorrect output:")
	t.Errorf(" key: %#v", testCase.key)
	t.Errorf(" input: %#v", input)
	t.Errorf(" expected: %#v", testCase.expected)
	t.Errorf(" got: %#v", out)
	}
	})
	}
	}

	func TestPrefixInList(t *testing.T) {
	prefixes := []string{"a", "b"}

	testcases := []struct {
	str string
	expected bool
	}{
	{
	str: "a-example",
	expected: true,
	},
	{
	str: "b-example",
	expected: true,
	},
	{
	str: "X-example",
	expected: false,
	},
	}

	for _, testCase := range testcases {
	t.Run(testCase.str, func(t *testing.T) {
	out := HasAnyPrefix(testCase.str, prefixes)
	if out != testCase.expected {
	t.Errorf("incorrect output:")
	t.Errorf(" str: %#v", testCase.str)
	t.Errorf(" prefixes: %#v", prefixes)
	t.Errorf(" expected: %#v", testCase.expected)
	t.Errorf(" got: %#v", out)
	}
	})
	}
	}

	func TestFilterList(t *testing.T) {
	input := []string{"a", "b", "c", "c", "b", "d", "a"}
	filter := []string{"a", "c"}
	remainder, filtered := FilterList(input, filter)

	expected := []string{"b", "b", "d"}
	if !reflect.DeepEqual(remainder, expected) {
	t.Errorf("incorrect remainder output:")
	t.Errorf(" input: %#v", input)
	t.Errorf(" filter: %#v", filter)
	t.Errorf(" expected: %#v", expected)
	t.Errorf(" got: %#v", remainder)
	}

	expected = []string{"a", "c", "c", "a"}
	if !reflect.DeepEqual(filtered, expected) {
	t.Errorf("incorrect filtered output:")
	t.Errorf(" input: %#v", input)
	t.Errorf(" filter: %#v", filter)
	t.Errorf(" expected: %#v", expected)
	t.Errorf(" got: %#v", filtered)
	}
	}

	func TestFilterListPred(t *testing.T) {
	pred := func(s string) bool { return strings.HasPrefix(s, "a/") }
	AssertArrayString(t, "filter", FilterListPred([]string{"a/c", "b/a", "a/b"}, pred), []string{"a/c", "a/b"})
	AssertArrayString(t, "filter", FilterListPred([]string{"b/c", "a/a", "b/b"}, pred), []string{"a/a"})
	AssertArrayString(t, "filter", FilterListPred([]string{"c/c", "b/a", "c/b"}, pred), []string{})
	AssertArrayString(t, "filter", FilterListPred([]string{"a/c", "a/a", "a/b"}, pred), []string{"a/c", "a/a", "a/b"})
	}

	func TestRemoveListFromList(t *testing.T) {
	input := []string{"a", "b", "c", "d", "a", "c", "d"}
	filter := []string{"a", "c"}
	expected := []string{"b", "d", "d"}
	out := RemoveListFromList(input, filter)
	if !reflect.DeepEqual(out, expected) {
	t.Errorf("incorrect output:")
	t.Errorf(" input: %#v", input)
	t.Errorf(" filter: %#v", filter)
	t.Errorf(" expected: %#v", expected)
	t.Errorf(" got: %#v", out)
	}
	}

	func TestRemoveFromList(t *testing.T) {
	testcases := []struct {
	name string
	key string
	input []string
	expectedFound bool
	expectedOut []string
	}{
	{
	name: "remove_one_match",
	key: "a",
	input: []string{"a", "b", "c"},
	expectedFound: true,
	expectedOut: []string{"b", "c"},
	},
	{
	name: "remove_three_matches",
	key: "a",
	input: []string{"a", "b", "a", "c", "a"},
	expectedFound: true,
	expectedOut: []string{"b", "c"},
	},
	{
	name: "remove_zero_matches",
	key: "X",
	input: []string{"a", "b", "a", "c", "a"},
	expectedFound: false,
	expectedOut: []string{"a", "b", "a", "c", "a"},
	},
	{
	name: "remove_all_matches",
	key: "a",
	input: []string{"a", "a", "a", "a"},
	expectedFound: true,
	expectedOut: []string{},
	},
	}

	for _, testCase := range testcases {
	t.Run(testCase.name, func(t *testing.T) {
	found, out := RemoveFromList(testCase.key, testCase.input)
	if found != testCase.expectedFound {
	t.Errorf("incorrect output:")
	t.Errorf(" key: %#v", testCase.key)
	t.Errorf(" input: %#v", testCase.input)
	t.Errorf(" expected: %#v", testCase.expectedFound)
	t.Errorf(" got: %#v", found)
	}
	if !reflect.DeepEqual(out, testCase.expectedOut) {
	t.Errorf("incorrect output:")
	t.Errorf(" key: %#v", testCase.key)
	t.Errorf(" input: %#v", testCase.input)
	t.Errorf(" expected: %#v", testCase.expectedOut)
	t.Errorf(" got: %#v", out)
	}
	})
	}
	}

	func TestCopyOfEmptyAndNil(t *testing.T) {
	emptyList := []string{}
	copyOfEmptyList := CopyOf(emptyList)
	AssertBoolEquals(t, "Copy of an empty list should be an empty list and not nil", true, copyOfEmptyList != nil)
	copyOfNilList := CopyOf(nil)
	AssertBoolEquals(t, "Copy of a nil list should be a nil list and not an empty list", true, copyOfNilList == nil)
	}

	func ExampleCopyOf() {
	a := []string{"1", "2", "3"}
	b := CopyOf(a)
	a[0] = "-1"
	fmt.Printf("a = %q\n", a)
	fmt.Printf("b = %q\n", b)

	// Output:
	// a = ["-1" "2" "3"]
	// b = ["1" "2" "3"]
	}

	func ExampleCopyOf_append() {
	a := make([]string, 1, 2)
	a[0] = "foo"

	fmt.Println("Without CopyOf:")
	b := append(a, "bar")
	c := append(a, "baz")
	fmt.Printf("a = %q\n", a)
	fmt.Printf("b = %q\n", b)
	fmt.Printf("c = %q\n", c)

	a = make([]string, 1, 2)
	a[0] = "foo"

	fmt.Println("With CopyOf:")
	b = append(CopyOf(a), "bar")
	c = append(CopyOf(a), "baz")
	fmt.Printf("a = %q\n", a)
	fmt.Printf("b = %q\n", b)
	fmt.Printf("c = %q\n", c)

	// Output:
	// Without CopyOf:
	// a = ["foo"]
	// b = ["foo" "baz"]
	// c = ["foo" "baz"]
	// With CopyOf:
	// a = ["foo"]
	// b = ["foo" "bar"]
	// c = ["foo" "baz"]
	}

	func TestSplitFileExt(t *testing.T) {
	t.Run("soname with version", func(t *testing.T) {
	root, suffix, ext := SplitFileExt("libtest.so.1.0.30")
	expected := "libtest"
	if root != expected {
	t.Errorf("root should be %q but got %q", expected, root)
	}
	expected = ".so.1.0.30"
	if suffix != expected {
	t.Errorf("suffix should be %q but got %q", expected, suffix)
	}
	expected = ".so"
	if ext != expected {
	t.Errorf("ext should be %q but got %q", expected, ext)
	}
	})

	t.Run("soname with svn version", func(t *testing.T) {
	root, suffix, ext := SplitFileExt("libtest.so.1svn")
	expected := "libtest"
	if root != expected {
	t.Errorf("root should be %q but got %q", expected, root)
	}
	expected = ".so.1svn"
	if suffix != expected {
	t.Errorf("suffix should be %q but got %q", expected, suffix)
	}
	expected = ".so"
	if ext != expected {
	t.Errorf("ext should be %q but got %q", expected, ext)
	}
	})

	t.Run("version numbers in the middle should be ignored", func(t *testing.T) {
	root, suffix, ext := SplitFileExt("libtest.1.0.30.so")
	expected := "libtest.1.0.30"
	if root != expected {
	t.Errorf("root should be %q but got %q", expected, root)
	}
	expected = ".so"
	if suffix != expected {
	t.Errorf("suffix should be %q but got %q", expected, suffix)
	}
	expected = ".so"
	if ext != expected {
	t.Errorf("ext should be %q but got %q", expected, ext)
	}
	})

	t.Run("no known file extension", func(t *testing.T) {
	root, suffix, ext := SplitFileExt("test.exe")
	expected := "test"
	if root != expected {
	t.Errorf("root should be %q but got %q", expected, root)
	}
	expected = ".exe"
	if suffix != expected {
	t.Errorf("suffix should be %q but got %q", expected, suffix)
	}
	if ext != expected {
	t.Errorf("ext should be %q but got %q", expected, ext)
	}
	})
	}

	func Test_Shard(t *testing.T) {
	type args struct {
	strings []string
	shardSize int
	}
	tests := []struct {
	name string
	args args
	want [][]string
	}{
	{
	name: "empty",
	args: args{
	strings: nil,
	shardSize: 1,
	},
	want: [][]string(nil),
	},
	{
	name: "single shard",
	args: args{
	strings: []string{"a", "b"},
	shardSize: 2,
	},
	want: [][]string{{"a", "b"}},
	},
	{
	name: "single short shard",
	args: args{
	strings: []string{"a", "b"},
	shardSize: 3,
	},
	want: [][]string{{"a", "b"}},
	},
	{
	name: "shard per input",
	args: args{
	strings: []string{"a", "b", "c"},
	shardSize: 1,
	},
	want: [][]string{{"a"}, {"b"}, {"c"}},
	},
	{
	name: "balanced shards",
	args: args{
	strings: []string{"a", "b", "c", "d"},
	shardSize: 2,
	},
	want: [][]string{{"a", "b"}, {"c", "d"}},
	},
	{
	name: "unbalanced shards",
	args: args{
	strings: []string{"a", "b", "c"},
	shardSize: 2,
	},
	want: [][]string{{"a", "b"}, {"c"}},
	},
	}
	for _, tt := range tests {
	t.Run(tt.name, func(t *testing.T) {
	t.Run("strings", func(t *testing.T) {
	if got := ShardStrings(tt.args.strings, tt.args.shardSize); !reflect.DeepEqual(got, tt.want) {
	t.Errorf("ShardStrings(%v, %v) = %v, want %v",
	tt.args.strings, tt.args.shardSize, got, tt.want)
	}
	})

	t.Run("paths", func(t *testing.T) {
	stringsToPaths := func(strings []string) Paths {
	if strings == nil {
	return nil
	}
	paths := make(Paths, len(strings))
	for i, s := range strings {
	paths[i] = PathForTesting(s)
	}
	return paths
	}

	paths := stringsToPaths(tt.args.strings)

	var want []Paths
	if sWant := tt.want; sWant != nil {
	want = make([]Paths, len(sWant))
	for i, w := range sWant {
	want[i] = stringsToPaths(w)
	}
	}

	if got := ShardPaths(paths, tt.args.shardSize); !reflect.DeepEqual(got, want) {
	t.Errorf("ShardPaths(%v, %v) = %v, want %v",
	paths, tt.args.shardSize, got, want)
	}
	})
	})
	}
	}

	func BenchmarkFirstUniqueStrings(b *testing.B) {
	implementations := []struct {
	name string
	f func([]string) []string
	}{
	{
	name: "list",
	f: firstUniqueStringsList,
	},
	{
	name: "map",
	f: firstUniqueStringsMap,
	},
	{
	name: "optimal",
	f: FirstUniqueStrings,
	},
	}
	const maxSize = 1024
	uniqueStrings := make([]string, maxSize)
	for i := range uniqueStrings {
	uniqueStrings[i] = strconv.Itoa(i)
	}
	sameString := make([]string, maxSize)
	for i := range sameString {
	sameString[i] = uniqueStrings[0]
	}

	f := func(b *testing.B, imp func([]string) []string, s []string) {
	for i := 0; i < b.N; i++ {
	b.ReportAllocs()
	s = append([]string(nil), s...)
	imp(s)
	}
	}

	for n := 1; n <= maxSize; n <<= 1 {
	b.Run(strconv.Itoa(n), func(b *testing.B) {
	for _, implementation := range implementations {
	b.Run(implementation.name, func(b *testing.B) {
	b.Run("same", func(b *testing.B) {
	f(b, implementation.f, sameString[:n])
	})
	b.Run("unique", func(b *testing.B) {
	f(b, implementation.f, uniqueStrings[:n])
	})
	})
	}
	})
	}
	}

	func testSortedKeysHelper[K Ordered, V any](t *testing.T, name string, input map[K]V, expected []K) {
	t.Helper()
	t.Run(name, func(t *testing.T) {
	actual := SortedKeys(input)
	if !reflect.DeepEqual(actual, expected) {
	t.Errorf("expected %v, got %v", expected, actual)
	}
	})
	}

	func TestSortedKeys(t *testing.T) {
	testSortedKeysHelper(t, "simple", map[string]string{
	"b": "bar",
	"a": "foo",
	}, []string{
	"a",
	"b",
	})
	testSortedKeysHelper(t, "ints", map[int]interface{}{
	10: nil,
	5: nil,
	}, []int{
	5,
	10,
	})

	testSortedKeysHelper(t, "nil", map[string]string(nil), nil)
	testSortedKeysHelper(t, "empty", map[string]string{}, nil)
	}

	func TestSortedStringValues(t *testing.T) {
	testCases := []struct {
	name string
	in interface{}
	expected []string
	}{
	{
	name: "nil",
	in: map[string]string(nil),
	expected: nil,
	},
	{
	name: "empty",
	in: map[string]string{},
	expected: nil,
	},
	{
	name: "simple",
	in: map[string]string{"foo": "a", "bar": "b"},
	expected: []string{"a", "b"},
	},
	{
	name: "duplicates",
	in: map[string]string{"foo": "a", "bar": "b", "baz": "b"},
	expected: []string{"a", "b", "b"},
	},
	}

	for _, tt := range testCases {
	t.Run(tt.name, func(t *testing.T) {
	got := SortedStringValues(tt.in)
	if g, w := got, tt.expected; !reflect.DeepEqual(g, w) {
	t.Errorf("wanted %q, got %q", w, g)
	}
	})
	}
	}

	func TestSortedUniqueStringValues(t *testing.T) {
	testCases := []struct {
	name string
	in interface{}
	expected []string
	}{
	{
	name: "nil",
	in: map[string]string(nil),
	expected: nil,
	},
	{
	name: "empty",
	in: map[string]string{},
	expected: nil,
	},
	{
	name: "simple",
	in: map[string]string{"foo": "a", "bar": "b"},
	expected: []string{"a", "b"},
	},
	{
	name: "duplicates",
	in: map[string]string{"foo": "a", "bar": "b", "baz": "b"},
	expected: []string{"a", "b"},
	},
	}

	for _, tt := range testCases {
	t.Run(tt.name, func(t *testing.T) {
	got := SortedUniqueStringValues(tt.in)
	if g, w := got, tt.expected; !reflect.DeepEqual(g, w) {
	t.Errorf("wanted %q, got %q", w, g)
	}
	})
	}
	}