Исходники и презентации

homework/functions/homework_test.go

@@ -0,0 +1,150 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Map(data []int, action func(int) int) []int {
+	// need to implement
+	return nil
+}
+
+func Filter(data []int, action func(int) bool) []int {
+	// need to implement
+	return nil
+}
+
+func Reduce(data []int, initial int, action func(int, int) int) int {
+	// need to implement
+	return 0
+}
+
+func TestMap(t *testing.T) {
+	tests := map[string]struct {
+		data   []int
+		action func(int) int
+		result []int
+	}{
+		"nil numbers": {
+			action: func(number int) int {
+				return -number
+			},
+		},
+		"empty numbers": {
+			data: []int{},
+			action: func(number int) int {
+				return -number
+			},
+			result: []int{},
+		},
+		"inc numbers": {
+			data: []int{1, 2, 3, 4, 5},
+			action: func(number int) int {
+				return number + 1
+			},
+			result: []int{2, 3, 4, 5, 6},
+		},
+		"double numbers": {
+			data: []int{1, 2, 3, 4, 5},
+			action: func(number int) int {
+				return number * number
+			},
+			result: []int{1, 4, 9, 16, 25},
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			result := Map(test.data, test.action)
+			assert.True(t, reflect.DeepEqual(test.result, result))
+		})
+	}
+}
+
+func TestFilter(t *testing.T) {
+	tests := map[string]struct {
+		data   []int
+		action func(int) bool
+		result []int
+	}{
+		"nil numbers": {
+			action: func(number int) bool {
+				return number == 0
+			},
+		},
+		"empty numbers": {
+			data: []int{},
+			action: func(number int) bool {
+				return number == 1
+			},
+			result: []int{},
+		},
+		"even numbers": {
+			data: []int{1, 2, 3, 4, 5},
+			action: func(number int) bool {
+				return number%2 == 0
+			},
+			result: []int{2, 4},
+		},
+		"positive numbers": {
+			data: []int{-1, -2, 1, 2},
+			action: func(number int) bool {
+				return number > 0
+			},
+			result: []int{1, 2},
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			result := Filter(test.data, test.action)
+			assert.True(t, reflect.DeepEqual(test.result, result))
+		})
+	}
+}
+
+func TestReduce(t *testing.T) {
+	tests := map[string]struct {
+		initial int
+		data    []int
+		action  func(int, int) int
+		result  int
+	}{
+		"nil numbers": {
+			action: func(lhs, rhs int) int {
+				return 0
+			},
+		},
+		"empty numbers": {
+			data: []int{},
+			action: func(lhs, rhs int) int {
+				return 0
+			},
+		},
+		"sum of numbers": {
+			data: []int{1, 2, 3, 4, 5},
+			action: func(lhs, rhs int) int {
+				return lhs + rhs
+			},
+			result: 15,
+		},
+		"sum of numbers with initial value": {
+			initial: 10,
+			data:    []int{1, 2, 3, 4, 5},
+			action: func(lhs, rhs int) int {
+				return lhs + rhs
+			},
+			result: 25,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			result := Reduce(test.data, test.initial, test.action)
+			assert.Equal(t, test.result, result)
+		})
+	}
+}