diff --git a/go.mod b/go.mod
index d8f82df..66f8087 100644
--- a/go.mod
+++ b/go.mod
@@ -4,5 +4,5 @@ go 1.15
 
 require (
 	github.com/apex/log v1.9.0
-	github.com/stretchr/testify v1.7.5
+	github.com/stretchr/testify v1.8.0
 )
diff --git a/go.sum b/go.sum
index f8b708b..ae462b4 100644
--- a/go.sum
+++ b/go.sum
@@ -44,8 +44,8 @@ github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSS
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.5 h1:s5PTfem8p8EbKQOctVV53k6jCJt3UX4IEJzwh+C324Q=
-github.com/stretchr/testify v1.7.5/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/tj/assert v0.0.0-20171129193455-018094318fb0/go.mod h1:mZ9/Rh9oLWpLLDRpvE+3b7gP/C2YyLFYxNmcLnPTMe0=
 github.com/tj/assert v0.0.3 h1:Df/BlaZ20mq6kuai7f5z2TvPFiwC3xaWJSDQNiIS3Rk=
 github.com/tj/assert v0.0.3/go.mod h1:Ne6X72Q+TB1AteidzQncjw9PabbMp4PBMZ1k+vd1Pvk=
diff --git a/mocks_test.go b/mocks_test.go
index 7ff42f6..95fbc62 100644
--- a/mocks_test.go
+++ b/mocks_test.go
@@ -21,6 +21,7 @@ package apex
 
 import (
 	"fmt"
+	"regexp"
 	"sync"
 	"testing"
 
@@ -50,7 +51,7 @@ func TestMock_Check(t *testing.T) {
 			name:   "different",
 			fields: fields{Logged: []string{"same"}},
 			args:   args{wantLogged: []string{"different"}},
-			want:   []string{"\n\tError Trace:\tmocks.go:67\n\t            \t\t\t\tmocks_test.go:63\n\tError:      \tNot equal: \n\t            \texpected: []string{\"different\"}\n\t            \tactual  : []string{\"same\"}\n\t            \t\n\t            \tDiff:\n\t            \t--- Expected\n\t            \t+++ Actual\n\t            \t@@ -1,3 +1,3 @@\n\t            \t ([]string) (len=1) {\n\t            \t- (string) (len=9) \"different\"\n\t            \t+ (string) (len=4) \"same\"\n\t            \t }\n\tTest:       \t\n"},
+			want:   []string{"\n\tError:      \tNot equal: \n\t            \texpected: []string{\"different\"}\n\t            \tactual  : []string{\"same\"}\n\t            \t\n\t            \tDiff:\n\t            \t--- Expected\n\t            \t+++ Actual\n\t            \t@@ -1,3 +1,3 @@\n\t            \t ([]string) (len=1) {\n\t            \t- (string) (len=9) \"different\"\n\t            \t+ (string) (len=4) \"same\"\n\t            \t }\n\tTest:       \t\n"},
 		},
 	}
 	for _, tt := range tests {
@@ -78,5 +79,12 @@ type MockT struct {
 }
 
 func (m *MockT) Errorf(format string, args ...interface{}) {
+	re, err := regexp.Compile(`(?s)^\tError Trace:.*(\tError:.*)$`)
+	assert.NoError(m, err)
+	for i, a := range args {
+		if s, ok := a.(string); ok {
+			args[i] = re.ReplaceAllString(s, "$1")
+		}
+	}
 	m.errors = append(m.errors, fmt.Sprintf(format, args...))
 }