diff --git a/src/device/input/button/parser.go b/src/device/input/button/parser.go
index 9ca66d2..cbdba8e 100644
--- a/src/device/input/button/parser.go
+++ b/src/device/input/button/parser.go
@@ -6,6 +6,10 @@ import (
 	"os"
 )
 
+var (
+	FlagButtonV01 = os.Getenv("BUTTON_V01") == "true"
+)
+
 type Parser interface {
 	Read() []Button
 	Close()
@@ -13,7 +17,7 @@ type Parser interface {
 }
 
 func New(ctx context.Context, src raw.Raw) Parser {
-	if os.Getenv("BUTTON_PARSER_V01") == "true" {
+	if FlagButtonV01 {
 		return NewV01(ctx, src)
 	}
 	return NewPlaintext(src)
diff --git a/src/device/input/button/plaintext.go b/src/device/input/button/plaintext.go
index 84df7b8..c6d7d79 100644
--- a/src/device/input/button/plaintext.go
+++ b/src/device/input/button/plaintext.go
@@ -5,6 +5,10 @@ import (
 	"os"
 )
 
+var (
+	FlagButtonPlaintextRelease = os.Getenv("BUTTON_PLAINTEXT_RELEASE")
+)
+
 type Plaintext struct {
 	src     raw.Raw
 	release byte
@@ -12,8 +16,8 @@ type Plaintext struct {
 
 func NewPlaintext(src raw.Raw) Plaintext {
 	releaseChar := byte('!')
-	if v := os.Getenv("BUTTON_PLAINTEXT_RELEASE"); v != "" {
-		releaseChar = byte(v[0])
+	if FlagButtonPlaintextRelease != "" {
+		releaseChar = byte(FlagButtonPlaintextRelease[0])
 	}
 	return Plaintext{
 		src:     src,
diff --git a/src/device/input/button/v01.go b/src/device/input/button/v01.go
index b3da54f..3af599b 100644
--- a/src/device/input/button/v01.go
+++ b/src/device/input/button/v01.go
@@ -12,7 +12,10 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-var debugging = os.Getenv("DEBUG") == "true"
+var (
+	FlagDebug           = os.Getenv("DEBUG") == "true"
+	FlagButtonV01Config = os.Getenv("BUTTON_V01_CONFIG")
+)
 
 type (
 	V01 struct {
@@ -41,7 +44,7 @@ type (
 
 func NewV01(ctx context.Context, src raw.Raw) V01 {
 	var cfg v01Cfg
-	b, _ := ioutil.ReadFile(os.Getenv("BUTTON_PARSER_V01_CONFIG"))
+	b, _ := ioutil.ReadFile(FlagButtonV01Config)
 	yaml.Unmarshal(b, &cfg)
 	ctx, can := context.WithCancel(ctx)
 	return V01{
@@ -99,7 +102,7 @@ func (t v01Transformation) pipe(s string) string {
 }
 
 func (v01 V01) telemetry(msg v01Msg) {
-	if debugging {
+	if FlagDebug {
 		log.Printf("%s|%dms", msg.U, time.Now().UnixNano()/int64(time.Millisecond)-msg.T)
 	}
 }
@@ -112,7 +115,7 @@ func (msg v01Msg) buttons() []Button {
 	for i := range msg.N {
 		buttons[len(msg.Y)+i] = Button{Char: msg.N[i], Down: false}
 	}
-	if debugging {
+	if FlagDebug {
 		log.Printf("%+v", msg)
 	}
 	return buttons
diff --git a/src/device/input/button/v01_exported_test.go b/src/device/input/button/v01_exported_test.go
index 29a2176..2372d18 100644
--- a/src/device/input/button/v01_exported_test.go
+++ b/src/device/input/button/v01_exported_test.go
@@ -46,7 +46,7 @@ func TestV01WithCfg(t *testing.T) {
       - transformation:
           w: i
    `), os.ModePerm)
-	os.Setenv("BUTTON_PARSER_V01_CONFIG", p)
+	button.FlagButtonV01Config = p
 
 	t.Run("unknown user ignored", func(t *testing.T) {
 		v01 := button.NewV01(context.Background(), constSrc(`{"U":"qt","Y":"w"}`))
diff --git a/src/device/input/input_exported_test.go b/src/device/input/input_exported_test.go
index 9dd1218..cb438f9 100644
--- a/src/device/input/input_exported_test.go
+++ b/src/device/input/input_exported_test.go
@@ -3,6 +3,7 @@ package input_test
 import (
 	"context"
 	"mayhem-party/src/device/input"
+	"mayhem-party/src/device/input/raw"
 	"mayhem-party/src/device/input/wrap"
 	"os"
 	"path"
@@ -32,10 +33,10 @@ func TestNewRemapped(t *testing.T) {
 	}
 
 	wrap.FlagRemapFile = remap
-	os.Setenv("RAW_RANDOM_WEIGHT_FILE", rand)
+	raw.FlagRawRandomWeightFile = rand
 	t.Cleanup(func() {
 		wrap.FlagRemapFile = ""
-		os.Unsetenv("RAW_RANDOM_WEIGHT_FILE")
+		raw.FlagRawRandomWeightFile = ""
 	})
 
 	r := input.New(context.Background())
@@ -72,9 +73,9 @@ func TestNewRandomWeightFile(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	os.Setenv("RAW_RANDOM_WEIGHT_FILE", p)
+	raw.FlagRawRandomWeightFile = p
 	t.Cleanup(func() {
-		os.Unsetenv("RAW_RANDOM_WEIGHT_FILE")
+		raw.FlagRawRandomWeightFile = ""
 	})
 
 	r := input.New(context.Background())
diff --git a/src/device/input/raw/keyboard.go b/src/device/input/raw/keyboard.go
index f9d53ee..9d5cc3f 100644
--- a/src/device/input/raw/keyboard.go
+++ b/src/device/input/raw/keyboard.go
@@ -50,7 +50,7 @@ func (kb Keyboard) Read() []byte {
 	if err != nil && err != io.EOF {
 		panic(err)
 	}
-	if os.Getenv("DEBUG") == "true" {
+	if FlagDebug {
 		log.Printf("raw.Keyboard.Read() %s", b[:n])
 	}
 	return b[:n]
diff --git a/src/device/input/raw/raw.go b/src/device/input/raw/raw.go
index 27b2d62..bbf1f6f 100644
--- a/src/device/input/raw/raw.go
+++ b/src/device/input/raw/raw.go
@@ -6,21 +6,27 @@ import (
 	"strconv"
 )
 
+var (
+	FlagRawKeyboard         = os.Getenv("RAW_KEYBOARD") == "true"
+	FlagRawUDP              = os.Getenv("RAW_UDP")
+	FlagRawRandomWeightFile = os.Getenv("RAW_RANDOM_WEIGHT_FILE")
+)
+
 type Raw interface {
 	Read() []byte
 	Close()
 }
 
 func New(ctx context.Context) Raw {
-	if os.Getenv("RAW_KEYBOARD") == "true" {
+	if FlagRawKeyboard {
 		return NewKeyboard()
 	}
-	if port, _ := strconv.Atoi(os.Getenv("RAW_UDP")); port != 0 {
+	if port, _ := strconv.Atoi(FlagRawUDP); port != 0 {
 		return NewUDP(ctx, port)
 	}
 	generator := randomCharFromRange('a', 'g')
-	if p := os.Getenv("RAW_RANDOM_WEIGHT_FILE"); p != "" {
-		generator = randomCharFromWeightFile(p)
+	if FlagRawRandomWeightFile != "" {
+		generator = randomCharFromWeightFile(FlagRawRandomWeightFile)
 	}
 	return NewRandom(generator)
 }
diff --git a/src/device/input/raw/udp.go b/src/device/input/raw/udp.go
index edfc7b4..05b2329 100644
--- a/src/device/input/raw/udp.go
+++ b/src/device/input/raw/udp.go
@@ -8,6 +8,10 @@ import (
 	"strconv"
 )
 
+var (
+	FlagDebug = os.Getenv("DEBUG") == "true"
+)
+
 type UDP struct {
 	conn net.PacketConn
 	c    chan []byte
@@ -29,14 +33,13 @@ func NewUDP(ctx context.Context, port int) UDP {
 }
 
 func (udp UDP) listen() {
-	debugging := os.Getenv("DEBUG") == "true"
 	for udp.ctx.Err() == nil {
 		buff := make([]byte, 256)
 		n, _, err := udp.conn.ReadFrom(buff)
 		if err != nil && udp.ctx.Err() == nil {
 			panic(err)
 		}
-		if debugging {
+		if FlagDebug {
 			log.Printf("raw.UDP.Read() => %s", buff[:n])
 		}
 		select {
diff --git a/src/device/input/wrap/buffered.go b/src/device/input/wrap/buffered.go
index c30a63e..8e30bab 100644
--- a/src/device/input/wrap/buffered.go
+++ b/src/device/input/wrap/buffered.go
@@ -9,6 +9,10 @@ import (
 	"time"
 )
 
+var (
+	FlagBufferedStickyDuration = os.Getenv("WRAP_BUFFERED_STICKY_DURATION")
+)
+
 type Buffered struct {
 	ctx                context.Context
 	can                context.CancelFunc
@@ -22,7 +26,7 @@ type Buffered struct {
 func NewBuffered(ctx context.Context, input Wrap) *Buffered {
 	ctx, can := context.WithCancel(ctx)
 	expirationInterval := time.Millisecond * 125
-	if d, err := time.ParseDuration(os.Getenv("WRAP_BUFFERED_STICKY_DURATION")); err == nil {
+	if d, err := time.ParseDuration(FlagBufferedStickyDuration); err == nil {
 		expirationInterval = d
 	}
 	result := &Buffered{