diff --git a/internal/config/codes_test.go b/internal/config/codes_test.go
new file mode 100644
index 0000000..cf1741c
--- /dev/null
+++ b/internal/config/codes_test.go
@@ -0,0 +1,118 @@
+package config
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/holoplot/go-evdev"
+	"github.com/stretchr/testify/suite"
+)
+
+type EventCodeParserTests struct {
+	suite.Suite
+}
+
+func TestRunnerEventCodeParserTests(t *testing.T) {
+	suite.Run(t, new(EventCodeParserTests))
+}
+
+func parseCodeTestCase(t *EventCodeParserTests, in string, out int, prefix string) {
+	t.Run(fmt.Sprintf("%s: %s", prefix, in), func() {
+		code, err := parseCode(in, prefix)
+		t.Nil(err)
+		t.EqualValues(out, code)
+	})
+}
+
+func (t *EventCodeParserTests) TestParseCodeABS() {
+	testCases := []struct {
+		in  string
+		out int
+	}{
+		{"ABS_X", evdev.ABS_X},
+		{"ABS_Y", evdev.ABS_Y},
+		{"ABS_Z", evdev.ABS_Z},
+		{"ABS_RX", evdev.ABS_RX},
+		{"ABS_RY", evdev.ABS_RY},
+		{"ABS_RZ", evdev.ABS_RZ},
+		{"ABS_THROTTLE", evdev.ABS_THROTTLE},
+		{"ABS_RUDDER", evdev.ABS_RUDDER},
+		{"x", evdev.ABS_X},
+		{"y", evdev.ABS_Y},
+		{"z", evdev.ABS_Z},
+		{"throttle", evdev.ABS_THROTTLE},
+		{"rudder", evdev.ABS_RUDDER},
+		{"0x0", evdev.ABS_X},
+		{"0x1", evdev.ABS_Y},
+		{"0x2", evdev.ABS_Z},
+	}
+
+	for _, testCase := range testCases {
+		parseCodeTestCase(t, testCase.in, testCase.out, "ABS")
+	}
+}
+
+func (t *EventCodeParserTests) TestParseCodeREL() {
+	testCases := []struct {
+		in  string
+		out int
+	}{
+		{"REL_X", evdev.REL_X},
+		{"REL_Y", evdev.REL_Y},
+		{"REL_Z", evdev.REL_Z},
+		{"REL_RX", evdev.REL_RX},
+		{"REL_RY", evdev.REL_RY},
+		{"REL_RZ", evdev.REL_RZ},
+		{"REL_WHEEL", evdev.REL_WHEEL},
+		{"REL_HWHEEL", evdev.REL_HWHEEL},
+		{"REL_MISC", evdev.REL_MISC},
+		{"x", evdev.REL_X},
+		{"y", evdev.REL_Y},
+		{"wheel", evdev.REL_WHEEL},
+		{"0x0", evdev.REL_X},
+		{"0x1", evdev.REL_Y},
+		{"0x2", evdev.REL_Z},
+	}
+
+	for _, testCase := range testCases {
+		parseCodeTestCase(t, testCase.in, testCase.out, "REL")
+	}
+}
+
+func (t *EventCodeParserTests) TestParseCodeBTN() {
+	testCases := []struct {
+		in  string
+		out int
+	}{
+		{"BTN_TRIGGER", evdev.BTN_TRIGGER},
+		{"trigger", evdev.BTN_TRIGGER},
+		{"0", evdev.BTN_TRIGGER},
+		{"0x120", evdev.BTN_TRIGGER},
+	}
+
+	for _, testCase := range testCases {
+		parseCodeTestCase(t, testCase.in, testCase.out, "BTN")
+	}
+}
+
+func (t *EventCodeParserTests) TestParseCodeInvalid() {
+	testCases := []struct {
+		in     string
+		prefix string
+	}{
+		{"badbutton", "BTN"},
+		{"ABS_X", "BTN"},
+		{"!@#$%^&*(){}-_", "BTN"},
+		{"REL_X", "ABS"},
+		{"ABS_W", "ABS"},
+		{"0", "ABS"},
+		{"0xg", "ABS"},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(fmt.Sprintf("%s - '%s'", testCase.prefix, testCase.in), func() {
+			_, err := parseCode(testCase.in, testCase.prefix)
+			t.NotNil(err)
+		})
+	}
+}