diff --git a/check/license_test.go b/check/license_test.go
index de2c978..daf296f 100644
--- a/check/license_test.go
+++ b/check/license_test.go
@@ -3,7 +3,7 @@ package check
 import "testing"
 
 func TestPercentage(t *testing.T) {
-	g := License{"testfiles", []string{}}
+	g := License{"testdata/testfiles", []string{}}
 	p, _, err := g.Percentage()
 	if err != nil {
 		t.Fatal(err)
diff --git a/check/testfiles/Godeps/a.go b/check/testdata/testfiles/Godeps/a.go
similarity index 100%
rename from check/testfiles/Godeps/a.go
rename to check/testdata/testfiles/Godeps/a.go
diff --git a/check/testfiles/Godeps/b.go b/check/testdata/testfiles/Godeps/b.go
similarity index 100%
rename from check/testfiles/Godeps/b.go
rename to check/testdata/testfiles/Godeps/b.go
diff --git a/check/testfiles/Godeps/c.go b/check/testdata/testfiles/Godeps/c.go
similarity index 100%
rename from check/testfiles/Godeps/c.go
rename to check/testdata/testfiles/Godeps/c.go
diff --git a/check/testfiles/LICENCE.txt b/check/testdata/testfiles/LICENCE.txt
similarity index 100%
rename from check/testfiles/LICENCE.txt
rename to check/testdata/testfiles/LICENCE.txt
diff --git a/check/testfiles/a.go b/check/testdata/testfiles/a.go
similarity index 100%
rename from check/testfiles/a.go
rename to check/testdata/testfiles/a.go
diff --git a/check/testfiles/a.pb.go b/check/testdata/testfiles/a.pb.go
similarity index 100%
rename from check/testfiles/a.pb.go
rename to check/testdata/testfiles/a.pb.go
diff --git a/check/testfiles/a.pb.gw.go b/check/testdata/testfiles/a.pb.gw.go
similarity index 100%
rename from check/testfiles/a.pb.gw.go
rename to check/testdata/testfiles/a.pb.gw.go
diff --git a/check/testfiles/b.go b/check/testdata/testfiles/b.go
similarity index 100%
rename from check/testfiles/b.go
rename to check/testdata/testfiles/b.go
diff --git a/check/testfiles/c.go b/check/testdata/testfiles/c.go
similarity index 100%
rename from check/testfiles/c.go
rename to check/testdata/testfiles/c.go
diff --git a/check/testfiles/d.go b/check/testdata/testfiles/d.go
similarity index 100%
rename from check/testfiles/d.go
rename to check/testdata/testfiles/d.go
diff --git a/check/testfiles/testdata/a.go b/check/testdata/testfiles/testdata/a.go
similarity index 100%
rename from check/testfiles/testdata/a.go
rename to check/testdata/testfiles/testdata/a.go
diff --git a/check/testfiles/third_party/a.go b/check/testdata/testfiles/third_party/a.go
similarity index 100%
rename from check/testfiles/third_party/a.go
rename to check/testdata/testfiles/third_party/a.go
diff --git a/check/testfiles/third_party/b.go b/check/testdata/testfiles/third_party/b.go
similarity index 100%
rename from check/testfiles/third_party/b.go
rename to check/testdata/testfiles/third_party/b.go
diff --git a/check/testfiles/third_party/c.go b/check/testdata/testfiles/third_party/c.go
similarity index 100%
rename from check/testfiles/third_party/c.go
rename to check/testdata/testfiles/third_party/c.go
diff --git a/check/testfiles/vendor/a.go b/check/testdata/testfiles/vendor/a.go
similarity index 100%
rename from check/testfiles/vendor/a.go
rename to check/testdata/testfiles/vendor/a.go
diff --git a/check/testfiles/vendor/b.go b/check/testdata/testfiles/vendor/b.go
similarity index 100%
rename from check/testfiles/vendor/b.go
rename to check/testdata/testfiles/vendor/b.go
diff --git a/check/testfiles/vendor/c.go b/check/testdata/testfiles/vendor/c.go
similarity index 100%
rename from check/testfiles/vendor/c.go
rename to check/testdata/testfiles/vendor/c.go
diff --git a/check/utils_test.go b/check/utils_test.go
index 5b94458..bcadb59 100644
--- a/check/utils_test.go
+++ b/check/utils_test.go
@@ -6,18 +6,18 @@ import (
 )
 
 func TestGoFiles(t *testing.T) {
-	files, skipped, err := GoFiles("testfiles/")
+	files, skipped, err := GoFiles("testdata/testfiles/")
 	if err != nil {
 		t.Fatal(err)
 	}
-	want := []string{"testfiles/a.go", "testfiles/b.go", "testfiles/c.go", "testfiles/d.go"}
+	want := []string{"testdata/testfiles/a.go", "testdata/testfiles/b.go", "testdata/testfiles/c.go", "testdata/testfiles/d.go"}
 	if !reflect.DeepEqual(files, want) {
-		t.Errorf("GoFiles(%q) = %v, want %v", "testfiles/", files, want)
+		t.Errorf("GoFiles(%q) = %v, want %v", "testdata/testfiles/", files, want)
 	}
 
-	wantSkipped := []string{"testfiles/a.pb.go", "testfiles/a.pb.gw.go"}
+	wantSkipped := []string{"testdata/testfiles/a.pb.go", "testdata/testfiles/a.pb.gw.go"}
 	if !reflect.DeepEqual(skipped, wantSkipped) {
-		t.Errorf("GoFiles(%q) skipped = %v, want %v", "testfiles/", skipped, wantSkipped)
+		t.Errorf("GoFiles(%q) skipped = %v, want %v", "testdata/testfiles/", skipped, wantSkipped)
 	}
 }
 
@@ -30,16 +30,16 @@ var goToolTests = []struct {
 	failed    []FileSummary
 	wantErr   bool
 }{
-	{"go vet", "testfiles", []string{"testfiles/a.go", "testfiles/b.go", "testfiles/c.go"}, []string{"go", "vet"}, 1, []FileSummary{}, false},
+	{"go vet", "testdata/testfiles", []string{"testdata/testfiles/a.go", "testdata/testfiles/b.go", "testdata/testfiles/c.go"}, []string{"go", "vet"}, 1, []FileSummary{}, false},
 	{
 		"staticcheck",
-		"testfiles/",
-		[]string{"testfiles/a.go", "testfiles/b.go", "testfiles/c.go", "testfiles/d.go"},
+		"testdata/testfiles/",
+		[]string{"testdata/testfiles/a.go", "testdata/testfiles/b.go", "testdata/testfiles/c.go", "testdata/testfiles/d.go"},
 		[]string{"staticcheck", "./..."},
 		0.75,
 		[]FileSummary{
 			{
-				Filename: "testfiles/d.go", FileURL: "",
+				Filename: "testdata/testfiles/d.go", FileURL: "",
 				Errors: []Error{
 					{LineNumber: 8, ErrorString: " func foo is unused (U1000)"},
 					{LineNumber: 10, ErrorString: " should use time.Until instead of t.Sub(time.Now()) (S1024)"}},