diff --git a/.golangci.yml b/.golangci.yml
index 6a349af..bc79b83 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -60,6 +60,7 @@ linters:
     - prealloc
     - rowserrcheck
     - testpackage
+    - tparallel
     - varnamelen
     - wastedassign
 
diff --git a/analyzer.go b/analyzer.go
index 9de53c3..e51df89 100644
--- a/analyzer.go
+++ b/analyzer.go
@@ -79,12 +79,17 @@ func (wa *wslAnalyzer) flags() flag.FlagSet {
 
 func (wa *wslAnalyzer) run(pass *analysis.Pass) (interface{}, error) {
 	for _, file := range pass.Files {
-		if !wa.config.IncludeGenerated && ast.IsGenerated(file) {
+		filename := getFilename(pass.Fset, file)
+		if !strings.HasSuffix(filename, ".go") {
 			continue
 		}
 
-		filename := getFilename(pass.Fset, file)
-		if !strings.HasSuffix(filename, ".go") {
+		// if the file is related to cgo the filename of the unadjusted position is a not a '.go' file.
+		fn := pass.Fset.PositionFor(file.Pos(), false).Filename
+
+		// The file is skipped if the "unadjusted" file is a Go file, and it's a generated file (ex: "_test.go" file).
+		// The other non-Go files are skipped by the first 'if' with the adjusted position.
+		if !wa.config.IncludeGenerated && ast.IsGenerated(file) && strings.HasSuffix(fn, ".go") {
 			continue
 		}
 
diff --git a/testdata/src/default_config/cgo.go.golden b/testdata/src/default_config/cgo.go.golden
deleted file mode 100644
index 5789e81..0000000
--- a/testdata/src/default_config/cgo.go.golden
+++ /dev/null
@@ -1,46 +0,0 @@
-package testpkg
-
-/*
- #include <stdio.h>
- #include <stdlib.h>
-
- void myprint(char* s) {
- 	printf("%d\n", s);
- }
-*/
-import "C"
-
-import (
-	"unsafe"
-)
-
-func _() {
-	cs := C.CString("Hello from stdio\n")
-	C.myprint(cs)
-	C.free(unsafe.Pointer(cs))
-}
-
-func Advanced() {
-	var foo = 1
-
-	var bar = 2 // want "declarations should never be cuddled"
-
-	var biz int // want "declarations should never be cuddled"
-
-	x := []string{}
-	x = append(x, "literal")
-	notUsed := "just assigning, don't mind me"
-
-	x = append(x, "not z..") // want "append only allowed to cuddle with appended value"
-	useMe := "right away"
-	alsoNotUsed := ":("
-
-	x = append(x, "just noise") // want "append only allowed to cuddle with appended value"
-	x = append(x, useMe)
-
-	_ = foo
-	_ = bar
-	_ = biz
-	_ = notUsed
-	_ = alsoNotUsed
-}
diff --git a/testdata/src/default_config/cgo.go b/testdata/src/default_config/cgo/cgo.go
similarity index 100%
rename from testdata/src/default_config/cgo.go
rename to testdata/src/default_config/cgo/cgo.go
diff --git a/testdata/src/default_config/line_directive.go b/testdata/src/default_config/line_directive/line_directive.go
similarity index 100%
rename from testdata/src/default_config/line_directive.go
rename to testdata/src/default_config/line_directive/line_directive.go
diff --git a/testdata/src/default_config/line_directive.go.golden b/testdata/src/default_config/line_directive/line_directive.go.golden
similarity index 100%
rename from testdata/src/default_config/line_directive.go.golden
rename to testdata/src/default_config/line_directive/line_directive.go.golden
diff --git a/testdata/src/default_config/line_directive.tmpl b/testdata/src/default_config/line_directive/line_directive.tmpl
similarity index 100%
rename from testdata/src/default_config/line_directive.tmpl
rename to testdata/src/default_config/line_directive/line_directive.tmpl
diff --git a/wsl_test.go b/wsl_test.go
index b845657..0070d6f 100644
--- a/wsl_test.go
+++ b/wsl_test.go
@@ -15,8 +15,6 @@ func TestWIP(t *testing.T) {
 }
 
 func TestDefaultConfig(t *testing.T) {
-	t.Parallel()
-
 	testdata := analysistest.TestData()
 
 	testCases := []struct {
@@ -32,6 +30,7 @@ func TestDefaultConfig(t *testing.T) {
 		{dir: "generic_handling"},
 		{dir: "multiline_case"},
 		{dir: "remove_whitespace"},
+		{dir: "line_directive"},
 	}
 
 	for _, test := range testCases {
@@ -44,6 +43,13 @@ func TestDefaultConfig(t *testing.T) {
 	}
 }
 
+func TestCGo(t *testing.T) {
+	testdata := analysistest.TestData()
+
+	analyzer := NewAnalyzer(nil)
+	analysistest.Run(t, testdata, analyzer, filepath.Join("default_config", "cgo"))
+}
+
 func TestWithConfig(t *testing.T) {
 	testdata := analysistest.TestData()