Add a LookupTrue utility function

It makes it a little bit clearer to make these queries.

env/env.go

@@ -1,7 +1,10 @@
 // Package env provides types to interact with environment setup.
 package env
 
-import "os"
+import (
+	"os"
+	"strconv"
+)
 
 // Execution specific.
 const (
@@ -66,7 +69,7 @@ const (
 type LookupFunc func(key string) (string, bool)
 
 // EmptyLookup is a LookupFunc that always returns "" and false.
-func EmptyLookup(key string) (string, bool) { return "", false }
+func EmptyLookup(_ string) (string, bool) { return "", false }
 
 // Lookup is a LookupFunc that uses os.LookupEnv.
 func Lookup(key string) (string, bool) { return os.LookupEnv(key) }
@@ -82,3 +85,17 @@ func ConstLookup(k, v string) LookupFunc {
 		return EmptyLookup(key)
 	}
 }
+
+// LookupBool is a LookupFunc that returns the result of os.Lookup as a bool.
+// Returns false either if the key does not exist or the value is not a bool.
+func LookupBool(key string) bool {
+	v, ok := os.LookupEnv(key)
+	if !ok {
+		return false
+	}
+	bv, err := strconv.ParseBool(v)
+	if err != nil {
+		return false
+	}
+	return bv
+}

tests/frame_test.go

@@ -3,7 +3,6 @@ package tests
 import (
 	"context"
 	"net/http"
-	"strconv"
 	"testing"
 	"time"
 
@@ -72,15 +71,13 @@ func TestFrameDismissDialogBox(t *testing.T) {
 func TestFrameNoPanicWithEmbeddedIFrame(t *testing.T) {
 	t.Parallel()
 
-	if s, ok := env.Lookup(env.BrowserHeadless); ok {
-		if v, err := strconv.ParseBool(s); err == nil && v {
-			// We're skipping this when running in headless
-			// environments since the bug that the test fixes
-			// only surfaces when in headfull mode.
-			// Remove this skip once we have headfull mode in
-			// CI: https://github.com/grafana/xk6-browser/issues/678
-			t.Skip("skipped when in headless mode")
-		}
+	// We're skipping this when running in headless
+	// environments since the bug that the test fixes
+	// only surfaces when in headfull mode.
+	// Remove this skip once we have headfull mode in
+	// CI: https://github.com/grafana/xk6-browser/issues/678
+	if env.LookupBool(env.BrowserHeadless) {
+		t.Skip("skipped when in headless mode")
 	}
 
 	// run the browser in headfull mode.
@@ -110,15 +107,13 @@ func TestFrameNoPanicWithEmbeddedIFrame(t *testing.T) {
 func TestFrameNoPanicNavigateAndClickOnPageWithIFrames(t *testing.T) {
 	t.Parallel()
 
-	if s, ok := env.Lookup(env.BrowserHeadless); ok {
-		if v, err := strconv.ParseBool(s); err == nil && v {
-			// We're skipping this when running in headless
-			// environments since the bug that the test fixes
-			// only surfaces when in headfull mode.
-			// Remove this skip once we have headfull mode in
-			// CI: https://github.com/grafana/xk6-browser/issues/678
-			t.Skip("skipped when in headless mode")
-		}
+	// We're skipping this when running in headless
+	// environments since the bug that the test fixes
+	// only surfaces when in headfull mode.
+	// Remove this skip once we have headfull mode in
+	// CI: https://github.com/grafana/xk6-browser/issues/678
+	if env.LookupBool(env.BrowserHeadless) {
+		t.Skip("skipped when in headless mode")
 	}
 
 	tb := newTestBrowser(