1 files changed, 78 insertions, 0 deletions
diff --git a/map_test.go b/map_test.go
new file mode 100644
index 0000000..112677e
--- /dev/null
+++ b/map_test.go
@@ -0,0 +1,78 @@
+package collection
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestMapSync(t *testing.T) {
+	type args struct {
+		collection []int
+		cb         func(int, int) int
+	}
+	tests := []struct {
+		name string
+		args args
+		want []int
+	}{
+		{
+			name: "multiple",
+			args: args{
+				collection: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
+				cb: func(item int, idx int) int {
+					return item * idx
+				},
+			},
+			want: []int{0, 2, 6, 12, 20, 30, 42, 56, 72, 90},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := MapSync(tt.args.collection, tt.args.cb); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Map() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMap(t *testing.T) {
+	type args struct {
+		collection []int
+		cb         func(int, int) string
+	}
+	tests := []struct {
+		name string
+		args args
+		want []string
+	}{
+		{
+			name: "counter",
+			args: args{
+				collection: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
+				cb: func(item int, idx int) string {
+					return fmt.Sprintf("%dth element is %d", idx, item)
+				},
+			},
+			want: []string{
+				"0th element is 1",
+				"1th element is 2",
+				"2th element is 3",
+				"3th element is 4",
+				"4th element is 5",
+				"5th element is 6",
+				"6th element is 7",
+				"7th element is 8",
+				"8th element is 9",
+				"9th element is 10",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Map(tt.args.collection, tt.args.cb); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Map() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}