From 84e79c473c2a02ab6b22506ede7d00764901eedd Mon Sep 17 00:00:00 2001
From: Fedor Korotkiy <prime@yandex-team.ru>
Date: Wed, 15 Apr 2020 23:29:34 +0300
Subject: [PATCH] Add reversemap task

---
 reversemap/README.md          |  6 ++++
 reversemap/reversemap.go      |  7 ++++
 reversemap/reversemap_test.go | 64 +++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 reversemap/README.md
 create mode 100644 reversemap/reversemap.go
 create mode 100644 reversemap/reversemap_test.go

diff --git a/reversemap/README.md b/reversemap/README.md
new file mode 100644
index 0000000..583f3ea
--- /dev/null
+++ b/reversemap/README.md
@@ -0,0 +1,6 @@
+# reversemap
+
+Реализуйте функцию reversemap, которая принимает на вход любой `map[K]V`,
+и возвращает обращённый `map[V]K`.
+
+Считайте, что все ключи и значения в исходном `map` уникальны.
diff --git a/reversemap/reversemap.go b/reversemap/reversemap.go
new file mode 100644
index 0000000..742844d
--- /dev/null
+++ b/reversemap/reversemap.go
@@ -0,0 +1,7 @@
+// +build !solution
+
+package reversemap
+
+func ReverseMap(forward interface{}) interface{} {
+	panic("implement me")
+}
diff --git a/reversemap/reversemap_test.go b/reversemap/reversemap_test.go
new file mode 100644
index 0000000..95a7df3
--- /dev/null
+++ b/reversemap/reversemap_test.go
@@ -0,0 +1,64 @@
+package reversemap
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestReverseMap(t *testing.T) {
+	data := []struct {
+		forward  interface{}
+		backward interface{}
+	}{
+		{
+			forward: map[string]string{
+				"k1": "v1",
+				"k2": "v2",
+				"k3": "v3",
+			},
+			backward: map[string]string{
+				"v1": "k1",
+				"v2": "k2",
+				"v3": "k3",
+			},
+		},
+		{
+			forward: map[int]string{
+				1: "v1",
+				2: "v2",
+				3: "v3",
+			},
+			backward: map[string]int{
+				"v1": 1,
+				"v2": 2,
+				"v3": 3,
+			},
+		},
+		{
+			forward: map[int]int{
+				1: 4,
+				2: 5,
+				3: 6,
+			},
+			backward: map[int]int{
+				4: 1,
+				5: 2,
+				6: 3,
+			},
+		},
+	}
+	for _, d := range data {
+		t.Run(reflect.TypeOf(d.forward).String(), func(t *testing.T) {
+			assert.Equal(t, d.backward, ReverseMap(d.forward))
+			assert.Equal(t, d.forward, ReverseMap(d.backward))
+		})
+	}
+}
+
+func TestReverseInt(t *testing.T) {
+	assert.Panics(t, func() {
+		ReverseMap(new(int))
+	})
+}