test for append() built-in

R=r, rsc
CC=golang-dev
https://golang.org/cl/2777041

test/append.go

+// $G $F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 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.
+
+// Semi-exhaustive test for append()
+
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+
+func verify(name string, result, expected interface{}) {
+	if !reflect.DeepEqual(result, expected) {
+		panic(name)
+	}
+}
+
+
+func main() {
+	for _, t := range tests {
+		verify(t.name, t.result, t.expected)
+	}
+	verifyStruct()
+	verifyInterface()
+}
+
+
+var tests = []struct {
+	name             string
+	result, expected interface{}
+}{
+	{"bool a", append([]bool{}), []bool{}},
+	{"bool b", append([]bool{}, true), []bool{true}},
+	{"bool c", append([]bool{}, true, false, true, true), []bool{true, false, true, true}},
+
+	{"bool d", append([]bool{true, false, true}), []bool{true, false, true}},
+	{"bool e", append([]bool{true, false, true}, false), []bool{true, false, true, false}},
+	{"bool f", append([]bool{true, false, true}, false, false, false), []bool{true, false, true, false, false, false}},
+
+	{"bool g", append([]bool{}, []bool{true}...), []bool{true}},
+	{"bool h", append([]bool{}, []bool{true, false, true, false}...), []bool{true, false, true, false}},
+
+	{"bool i", append([]bool{true, false, true}, []bool{true}...), []bool{true, false, true, true}},
+	{"bool j", append([]bool{true, false, true}, []bool{true, true, true}...), []bool{true, false, true, true, true, true}},
+
+
+	{"byte a", append([]byte{}), []byte{}},
+	{"byte b", append([]byte{}, 0), []byte{0}},
+	{"byte c", append([]byte{}, 0, 1, 2, 3), []byte{0, 1, 2, 3}},
+
+	{"byte d", append([]byte{0, 1, 2}), []byte{0, 1, 2}},
+	{"byte e", append([]byte{0, 1, 2}, 3), []byte{0, 1, 2, 3}},
+	{"byte f", append([]byte{0, 1, 2}, 3, 4, 5), []byte{0, 1, 2, 3, 4, 5}},
+
+	{"byte g", append([]byte{}, []byte{0}...), []byte{0}},
+	{"byte h", append([]byte{}, []byte{0, 1, 2, 3}...), []byte{0, 1, 2, 3}},
+
+	{"byte i", append([]byte{0, 1, 2}, []byte{3}...), []byte{0, 1, 2, 3}},
+	{"byte j", append([]byte{0, 1, 2}, []byte{3, 4, 5}...), []byte{0, 1, 2, 3, 4, 5}},
+
+
+	{"int16 a", append([]int16{}), []int16{}},
+	{"int16 b", append([]int16{}, 0), []int16{0}},
+	{"int16 c", append([]int16{}, 0, 1, 2, 3), []int16{0, 1, 2, 3}},
+
+	{"int16 d", append([]int16{0, 1, 2}), []int16{0, 1, 2}},
+	{"int16 e", append([]int16{0, 1, 2}, 3), []int16{0, 1, 2, 3}},
+	{"int16 f", append([]int16{0, 1, 2}, 3, 4, 5), []int16{0, 1, 2, 3, 4, 5}},
+
+	{"int16 g", append([]int16{}, []int16{0}...), []int16{0}},
+	{"int16 h", append([]int16{}, []int16{0, 1, 2, 3}...), []int16{0, 1, 2, 3}},
+
+	{"int16 i", append([]int16{0, 1, 2}, []int16{3}...), []int16{0, 1, 2, 3}},
+	{"int16 j", append([]int16{0, 1, 2}, []int16{3, 4, 5}...), []int16{0, 1, 2, 3, 4, 5}},
+
+
+	{"uint32 a", append([]uint32{}), []uint32{}},
+	{"uint32 b", append([]uint32{}, 0), []uint32{0}},
+	{"uint32 c", append([]uint32{}, 0, 1, 2, 3), []uint32{0, 1, 2, 3}},
+
+	{"uint32 d", append([]uint32{0, 1, 2}), []uint32{0, 1, 2}},
+	{"uint32 e", append([]uint32{0, 1, 2}, 3), []uint32{0, 1, 2, 3}},
+	{"uint32 f", append([]uint32{0, 1, 2}, 3, 4, 5), []uint32{0, 1, 2, 3, 4, 5}},
+
+	{"uint32 g", append([]uint32{}, []uint32{0}...), []uint32{0}},
+	{"uint32 h", append([]uint32{}, []uint32{0, 1, 2, 3}...), []uint32{0, 1, 2, 3}},
+
+	{"uint32 i", append([]uint32{0, 1, 2}, []uint32{3}...), []uint32{0, 1, 2, 3}},
+	{"uint32 j", append([]uint32{0, 1, 2}, []uint32{3, 4, 5}...), []uint32{0, 1, 2, 3, 4, 5}},
+
+
+	{"float64 a", append([]float64{}), []float64{}},
+	{"float64 b", append([]float64{}, 0), []float64{0}},
+	{"float64 c", append([]float64{}, 0, 1, 2, 3), []float64{0, 1, 2, 3}},
+
+	{"float64 d", append([]float64{0, 1, 2}), []float64{0, 1, 2}},
+	{"float64 e", append([]float64{0, 1, 2}, 3), []float64{0, 1, 2, 3}},
+	{"float64 f", append([]float64{0, 1, 2}, 3, 4, 5), []float64{0, 1, 2, 3, 4, 5}},
+
+	{"float64 g", append([]float64{}, []float64{0}...), []float64{0}},
+	{"float64 h", append([]float64{}, []float64{0, 1, 2, 3}...), []float64{0, 1, 2, 3}},
+
+	{"float64 i", append([]float64{0, 1, 2}, []float64{3}...), []float64{0, 1, 2, 3}},
+	{"float64 j", append([]float64{0, 1, 2}, []float64{3, 4, 5}...), []float64{0, 1, 2, 3, 4, 5}},
+
+
+	{"complex128 a", append([]complex128{}), []complex128{}},
+	{"complex128 b", append([]complex128{}, 0), []complex128{0}},
+	{"complex128 c", append([]complex128{}, 0, 1, 2, 3), []complex128{0, 1, 2, 3}},
+
+	{"complex128 d", append([]complex128{0, 1, 2}), []complex128{0, 1, 2}},
+	{"complex128 e", append([]complex128{0, 1, 2}, 3), []complex128{0, 1, 2, 3}},
+	{"complex128 f", append([]complex128{0, 1, 2}, 3, 4, 5), []complex128{0, 1, 2, 3, 4, 5}},
+
+	{"complex128 g", append([]complex128{}, []complex128{0}...), []complex128{0}},
+	{"complex128 h", append([]complex128{}, []complex128{0, 1, 2, 3}...), []complex128{0, 1, 2, 3}},
+
+	{"complex128 i", append([]complex128{0, 1, 2}, []complex128{3}...), []complex128{0, 1, 2, 3}},
+	{"complex128 j", append([]complex128{0, 1, 2}, []complex128{3, 4, 5}...), []complex128{0, 1, 2, 3, 4, 5}},
+
+
+	{"string a", append([]string{}), []string{}},
+	{"string b", append([]string{}, "0"), []string{"0"}},
+	{"string c", append([]string{}, "0", "1", "2", "3"), []string{"0", "1", "2", "3"}},
+
+	{"string d", append([]string{"0", "1", "2"}), []string{"0", "1", "2"}},
+	{"string e", append([]string{"0", "1", "2"}, "3"), []string{"0", "1", "2", "3"}},
+	{"string f", append([]string{"0", "1", "2"}, "3", "4", "5"), []string{"0", "1", "2", "3", "4", "5"}},
+
+	{"string g", append([]string{}, []string{"0"}...), []string{"0"}},
+	{"string h", append([]string{}, []string{"0", "1", "2", "3"}...), []string{"0", "1", "2", "3"}},
+
+	{"string i", append([]string{"0", "1", "2"}, []string{"3"}...), []string{"0", "1", "2", "3"}},
+	{"string j", append([]string{"0", "1", "2"}, []string{"3", "4", "5"}...), []string{"0", "1", "2", "3", "4", "5"}},
+}
+
+
+func verifyStruct() {
+	type T struct {
+		a, b, c string
+	}
+	type S []T
+	e := make(S, 100)
+	for i := range e {
+		e[i] = T{"foo", fmt.Sprintf("%d", i), "bar"}
+	}
+
+	verify("struct a", append(S{}), S{})
+	verify("struct b", append(S{}, e[0]), e[0:1])
+	verify("struct c", append(S{}, e[0], e[1], e[2]), e[0:3])
+
+	verify("struct d", append(e[0:1]), e[0:1])
+	verify("struct e", append(e[0:1], e[1]), e[0:2])
+	verify("struct f", append(e[0:1], e[1], e[2], e[3]), e[0:4])
+
+	verify("struct g", append(e[0:3]), e[0:3])
+	verify("struct h", append(e[0:3], e[3]), e[0:4])
+	verify("struct i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7])
+
+	for i := range e {
+		verify("struct j", append(S{}, e[0:i]...), e[0:i])
+		input := make(S, i)
+		copy(input, e[0:i])
+		verify("struct k", append(input, e[i:]...), e)
+		verify("struct k - input modified", input, e[0:i])
+	}
+
+	s := make(S, 10, 20)
+	r := make(S, len(s)+len(e))
+	for i, x := range e {
+		r[len(s)+i] = x
+	}
+	verify("struct l", append(s), s)
+	verify("struct m", append(s, e...), r)
+}
+
+
+func verifyInterface() {
+	type T interface{}
+	type S []T
+	e := make(S, 100)
+	for i := range e {
+		switch i % 4 {
+		case 0:
+			e[i] = i
+		case 1:
+			e[i] = "foo"
+		case 2:
+			e[i] = fmt.Sprintf("%d", i)
+		case 3:
+			e[i] = float(i)
+		}
+	}
+
+	verify("interface a", append(S{}), S{})
+	verify("interface b", append(S{}, e[0]), e[0:1])
+	verify("interface c", append(S{}, e[0], e[1], e[2]), e[0:3])
+
+	verify("interface d", append(e[0:1]), e[0:1])
+	verify("interface e", append(e[0:1], e[1]), e[0:2])
+	verify("interface f", append(e[0:1], e[1], e[2], e[3]), e[0:4])
+
+	verify("interface g", append(e[0:3]), e[0:3])
+	verify("interface h", append(e[0:3], e[3]), e[0:4])
+	verify("interface i", append(e[0:3], e[3], e[4], e[5], e[6]), e[0:7])
+
+	for i := range e {
+		verify("interface j", append(S{}, e[0:i]...), e[0:i])
+		input := make(S, i)
+		copy(input, e[0:i])
+		verify("interface k", append(input, e[i:]...), e)
+		verify("interface k - input modified", input, e[0:i])
+	}
+
+	s := make(S, 10, 20)
+	r := make(S, len(s)+len(e))
+	for i, x := range e {
+		r[len(s)+i] = x
+	}
+	verify("interface l", append(s), s)
+	verify("interface m", append(s, e...), r)
+}