diff --git a/go.mod b/go.mod
index dd974a3..1cb3130 100644
--- a/go.mod
+++ b/go.mod
@@ -5,5 +5,4 @@ go 1.13
 require (
 	github.com/mattn/getwild v0.0.1
 	github.com/mattn/go-tty v0.0.3
-	github.com/stretchr/testify v1.4.0
 )
diff --git a/go.sum b/go.sum
index 3da3b9e..dec2c94 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/mattn/getwild v0.0.1 h1:+Nlzxt7fonj2MtO9y/rg5hxOnM3H6tuTqeD38W25jfo=
 github.com/mattn/getwild v0.0.1/go.mod h1:AG+GKQydHp7iLJn+VV+D7y8LeYs5bQ0Xz4fmKd5o1Sg=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
@@ -9,17 +7,8 @@ github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcME
 github.com/mattn/go-runewidth v0.0.6/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-tty v0.0.3 h1:5OfyWorkyO7xP52Mq7tB36ajHDG5OHrmBGIS/DtakQI=
 github.com/mattn/go-tty v0.0.3/go.mod h1:ihxohKRERHTVzN+aSVRwACLCeqIoZAWpoICkkvrWyR0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e h1:N7DeIrjYszNmSW409R3frPPwglRwMkXSBzwVbkOjLLA=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/mmv_test.go b/mmv_test.go
index 2d8e270..477a2be 100644
--- a/mmv_test.go
+++ b/mmv_test.go
@@ -4,10 +4,9 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"reflect"
+	"strings"
 	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 )
 
 func TestRename(t *testing.T) {
@@ -301,19 +300,31 @@ func TestRename(t *testing.T) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			dir, err := ioutil.TempDir("", "mmv-")
+			if err != nil {
+				t.Fatalf("ioutil.TempDir returned an error: %s", err)
+			}
 			defer os.RemoveAll(dir)
-			require.NoError(t, os.Chdir(dir))
-			require.NoError(t, err)
-			require.NoError(t, setupFiles(tc.contents))
+			if err := os.Chdir(dir); err != nil {
+				t.Fatalf("os.Chdir returned an error: %s", err)
+			}
+			if err := setupFiles(tc.contents); err != nil {
+				t.Fatalf("setupFiles returned an error: %s", err)
+			}
 			rs, _ := buildRenames(clone(tc.files))
-			assert.Equal(t, tc.count, len(rs))
+			if got := len(rs); got != tc.count {
+				t.Errorf("expected: %d, got: %d", tc.count, got)
+			}
 			err = Rename(tc.files)
 			if tc.err == "" {
-				assert.NoError(t, err)
-			} else {
-				assert.Contains(t, err.Error(), tc.err)
+				if err != nil {
+					t.Errorf("Rename returned an error: %s", err)
+				}
+			} else if !strings.Contains(err.Error(), tc.err) {
+				t.Errorf("error should contain: %s, got: %s", tc.err, err)
+			}
+			if got := fileContents("."); !reflect.DeepEqual(got, tc.expected) {
+				t.Errorf("expected: %v, got: %v", tc.expected, got)
 			}
-			assert.Equal(t, tc.expected, fileContents("."))
 		})
 	}
 }