diff --git a/platforms/beaglebone/beaglebone_adaptor_test.go b/platforms/beaglebone/beaglebone_adaptor_test.go
index 848a2428..3ce44ad4 100644
--- a/platforms/beaglebone/beaglebone_adaptor_test.go
+++ b/platforms/beaglebone/beaglebone_adaptor_test.go
@@ -113,11 +113,11 @@ func TestBeagleboneAdaptor(t *testing.T) {
 	gobottest.Assert(t, a.ServoWrite("P9_99", 175), errors.New("Not a valid PWM pin"))
 
 	fs.WithReadError = true
-	gobottest.Assert(t, a.PwmWrite("P9_21", 175), errors.New("read error"))
+	gobottest.Assert(t, strings.Contains(a.PwmWrite("P9_21", 175).Error(), "read error"), true)
 	fs.WithReadError = false
 
 	fs.WithWriteError = true
-	gobottest.Assert(t, a.PwmWrite("P9_22", 175), errors.New("write error"))
+	gobottest.Assert(t, strings.Contains(a.PwmWrite("P9_22", 175).Error(), "write error"), true)
 	fs.WithWriteError = false
 
 	// Analog
diff --git a/platforms/chip/chip_adaptor_test.go b/platforms/chip/chip_adaptor_test.go
index 05617bfd..be6449fd 100644
--- a/platforms/chip/chip_adaptor_test.go
+++ b/platforms/chip/chip_adaptor_test.go
@@ -208,7 +208,7 @@ func TestAdaptorPwmWriteError(t *testing.T) {
 	fs.WithWriteError = true
 
 	err := a.PwmWrite("PWM0", 100)
-	gobottest.Assert(t, err, errors.New("write error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "write error"), true)
 }
 
 func TestAdaptorPwmReadError(t *testing.T) {
@@ -216,7 +216,7 @@ func TestAdaptorPwmReadError(t *testing.T) {
 	fs.WithReadError = true
 
 	err := a.PwmWrite("PWM0", 100)
-	gobottest.Assert(t, err, errors.New("read error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "read error"), true)
 }
 
 func TestChipDefaultBus(t *testing.T) {
diff --git a/platforms/intel-iot/edison/edison_adaptor_test.go b/platforms/intel-iot/edison/edison_adaptor_test.go
index a4be12d0..e4555fab 100644
--- a/platforms/intel-iot/edison/edison_adaptor_test.go
+++ b/platforms/intel-iot/edison/edison_adaptor_test.go
@@ -479,7 +479,7 @@ func TestAdaptorPwmWriteError(t *testing.T) {
 	fs.WithWriteError = true
 
 	err := a.PwmWrite("5", 100)
-	gobottest.Assert(t, err, errors.New("write error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "write error"), true)
 }
 
 func TestAdaptorPwmReadError(t *testing.T) {
@@ -488,7 +488,7 @@ func TestAdaptorPwmReadError(t *testing.T) {
 	fs.WithReadError = true
 
 	err := a.PwmWrite("5", 100)
-	gobottest.Assert(t, err, errors.New("read error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "read error"), true)
 }
 
 func TestAdaptorAnalog(t *testing.T) {
diff --git a/platforms/upboard/up2/adaptor_test.go b/platforms/upboard/up2/adaptor_test.go
index b448d953..3bcba7d0 100644
--- a/platforms/upboard/up2/adaptor_test.go
+++ b/platforms/upboard/up2/adaptor_test.go
@@ -169,7 +169,7 @@ func TestUP2AdaptorPwmWriteError(t *testing.T) {
 	fs.WithWriteError = true
 
 	err := a.PwmWrite("32", 100)
-	gobottest.Assert(t, err, errors.New("write error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "write error"), true)
 }
 
 func TestUP2AdaptorPwmReadError(t *testing.T) {
@@ -177,7 +177,7 @@ func TestUP2AdaptorPwmReadError(t *testing.T) {
 	fs.WithReadError = true
 
 	err := a.PwmWrite("32", 100)
-	gobottest.Assert(t, err, errors.New("read error"))
+	gobottest.Assert(t, strings.Contains(err.Error(), "read error"), true)
 }
 
 func TestUP2I2CDefaultBus(t *testing.T) {