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 // Copyright 2020 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 slices import ( "math" "strings" "testing" "constraints" ) func TestEqual(t *testing.T) { s1 := []int{1, 2, 3} if !Equal(s1, s1) { t.Errorf("Equal(%v, %v) = false, want true", s1, s1) } s2 := []int{1, 2, 3} if !Equal(s1, s2) { t.Errorf("Equal(%v, %v) = false, want true", s1, s2) } s2 = append(s2, 4) if Equal(s1, s2) { t.Errorf("Equal(%v, %v) = true, want false", s1, s2) } s3 := []float64{1, 2, math.NaN()} if !Equal(s3, s3) { t.Errorf("Equal(%v, %v) = false, want true", s3, s3) } if Equal(s1, nil) { t.Errorf("Equal(%v, nil) = true, want false", s1) } if Equal(nil, s1) { t.Errorf("Equal(nil, %v) = true, want false", s1) } if !Equal(s1[:0], nil) { t.Errorf("Equal(%v, nil = false, want true", s1[:0]) } } func offByOne[Elem constraints.Integer](a, b Elem) bool { return a == b + 1 || a == b - 1 } func TestEqualFn(t *testing.T) { s1 := []int{1, 2, 3} s2 := []int{2, 3, 4} if EqualFn(s1, s1, offByOne[int]) { t.Errorf("EqualFn(%v, %v, offByOne) = true, want false", s1, s1) } if !EqualFn(s1, s2, offByOne[int]) { t.Errorf("EqualFn(%v, %v, offByOne) = false, want true", s1, s2) } s3 := []string{"a", "b", "c"} s4 := []string{"A", "B", "C"} if !EqualFn(s3, s4, strings.EqualFold) { t.Errorf("EqualFn(%v, %v, strings.EqualFold) = false, want true", s3, s4) } if !EqualFn(s1[:0], nil, offByOne[int]) { t.Errorf("EqualFn(%v, nil, offByOne) = false, want true", s1[:0]) } } func TestMap(t *testing.T) { s1 := []int{1, 2, 3} s2 := Map(s1, func(i int) float64 { return float64(i) * 2.5 }) if want := []float64{2.5, 5, 7.5}; !Equal(s2, want) { t.Errorf("Map(%v, ...) = %v, want %v", s1, s2, want) } s3 := []string{"Hello", "World"} s4 := Map(s3, strings.ToLower) if want := []string{"hello", "world"}; !Equal(s4, want) { t.Errorf("Map(%v, strings.ToLower) = %v, want %v", s3, s4, want) } s5 := Map(nil, func(i int) int { return i }) if len(s5) != 0 { t.Errorf("Map(nil, identity) = %v, want empty slice", s5) } } func TestReduce(t *testing.T) { s1 := []int{1, 2, 3} r := Reduce(s1, 0, func(f float64, i int) float64 { return float64(i) * 2.5 + f }) if want := 15.0; r != want { t.Errorf("Reduce(%v, 0, ...) = %v, want %v", s1, r, want) } if got := Reduce(nil, 0, func(i, j int) int { return i + j}); got != 0 { t.Errorf("Reduce(nil, 0, add) = %v, want 0", got) } } func TestFilter(t *testing.T) { s1 := []int{1, 2, 3} s2 := Filter(s1, func(i int) bool { return i%2 == 0 }) if want := []int{2}; !Equal(s2, want) { t.Errorf("Filter(%v, even) = %v, want %v", s1, s2, want) } if s3 := Filter(s1[:0], func(i int) bool { return true }); len(s3) > 0 { t.Errorf("Filter(%v, identity) = %v, want empty slice", s1[:0], s3) } } func TestMax(t *testing.T) { s1 := []int{1, 2, 3, -5} if got, want := Max(s1), 3; got != want { t.Errorf("Max(%v) = %d, want %d", s1, got, want) } s2 := []string{"aaa", "a", "aa", "aaaa"} if got, want := Max(s2), "aaaa"; got != want { t.Errorf("Max(%v) = %q, want %q", s2, got, want) } if got, want := Max(s2[:0]), ""; got != want { t.Errorf("Max(%v) = %q, want %q", s2[:0], got, want) } } func TestMin(t *testing.T) { s1 := []int{1, 2, 3, -5} if got, want := Min(s1), -5; got != want { t.Errorf("Min(%v) = %d, want %d", s1, got, want) } s2 := []string{"aaa", "a", "aa", "aaaa"} if got, want := Min(s2), "a"; got != want { t.Errorf("Min(%v) = %q, want %q", s2, got, want) } if got, want := Min(s2[:0]), ""; got != want { t.Errorf("Min(%v) = %q, want %q", s2[:0], got, want) } } func TestAppend(t *testing.T) { s := []int{1, 2, 3} s = Append(s, 4, 5, 6) want := []int{1, 2, 3, 4, 5, 6} if !Equal(s, want) { t.Errorf("after Append got %v, want %v", s, want) } } func TestCopy(t *testing.T) { s1 := []int{1, 2, 3} s2 := []int{4, 5} if got := Copy(s1, s2); got != 2 { t.Errorf("Copy returned %d, want 2", got) } want := []int{4, 5, 3} if !Equal(s1, want) { t.Errorf("after Copy got %v, want %v", s1, want) } }