extract: add comments for clarity

Author: bschaatsbergen

statecheck/extract_bool_value_test.go

@@ -19,6 +19,7 @@ import (
 func TestExtractBoolValue_CheckState_Basic(t *testing.T) {
 	t.Parallel()
 
+	// targetVar will be set to the extracted value.
 	var targetVar bool
 
 	r.Test(t, r.TestCase{
@@ -49,6 +50,7 @@ func TestExtractBoolValue_CheckState_Basic(t *testing.T) {
 func TestExtractBoolValue_CheckState_KnownValueWrongType(t *testing.T) {
 	t.Parallel()
 
+	// targetVar will be set to the extracted value.
 	var targetVar bool
 
 	r.Test(t, r.TestCase{
@@ -79,6 +81,7 @@ func TestExtractBoolValue_CheckState_KnownValueWrongType(t *testing.T) {
 func TestExtractBoolValue_CheckState_Null(t *testing.T) {
 	t.Parallel()
 
+	// targetVar will be set to the extracted value.
 	var targetVar bool
 
 	r.Test(t, r.TestCase{