diff --git a/openapi2kong/openapi2kong_test.go b/openapi2kong/openapi2kong_test.go
index 7884595..01618f2 100644
--- a/openapi2kong/openapi2kong_test.go
+++ b/openapi2kong/openapi2kong_test.go
@@ -3,6 +3,7 @@ package openapi2kong
 import (
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"os"
 	"strings"
 	"testing"
@@ -12,30 +13,44 @@ import (
 
 const fixturePath = "./oas3_testfiles/"
 
-func Test_Openapi2kong(t *testing.T) {
+// findFilesBySuffix returns a list of files in the fixturePath
+// that end with the given suffix.
+func findFilesBySuffix(t *testing.T, suffix string) []fs.DirEntry {
 	files, err := os.ReadDir(fixturePath)
 	if err != nil {
 		t.Error("failed reading test data: %w", err)
 	}
 
+	// loop over all files, and remove anything that doesn't end with ".yaml"
+	for i := 0; i < len(files); i++ {
+		if !strings.HasSuffix(files[i].Name(), suffix) {
+			files = append(files[:i], files[i+1:]...)
+			i--
+		}
+	}
+
+	return files
+}
+
+func Test_Openapi2kong(t *testing.T) {
+	files := findFilesBySuffix(t, ".yaml")
+
 	for _, file := range files {
 		fileNameIn := file.Name()
-		if strings.HasSuffix(fileNameIn, ".yaml") {
-			fileNameExpected := strings.TrimSuffix(fileNameIn, ".yaml") + ".expected.json"
-			fileNameOut := strings.TrimSuffix(fileNameIn, ".yaml") + ".generated.json"
-			dataIn, _ := os.ReadFile(fixturePath + fileNameIn)
-			dataOut, err := Convert(dataIn, O2kOptions{
-				Tags: []string{"OAS3_import", "OAS3file_" + fileNameIn},
-			})
-			if err != nil {
-				t.Error(fmt.Sprintf("'%s' didn't expect error: %%w", fixturePath+fileNameIn), err)
-			} else {
-				JSONOut, _ := json.MarshalIndent(dataOut, "", "  ")
-				os.WriteFile(fixturePath+fileNameOut, JSONOut, 0o600)
-				JSONExpected, _ := os.ReadFile(fixturePath + fileNameExpected)
-				assert.JSONEq(t, string(JSONExpected), string(JSONOut),
-					"'%s': the JSON blobs should be equal", fixturePath+fileNameIn)
-			}
+		fileNameExpected := strings.TrimSuffix(fileNameIn, ".yaml") + ".expected.json"
+		fileNameOut := strings.TrimSuffix(fileNameIn, ".yaml") + ".generated.json"
+		dataIn, _ := os.ReadFile(fixturePath + fileNameIn)
+		dataOut, err := Convert(dataIn, O2kOptions{
+			Tags: []string{"OAS3_import", "OAS3file_" + fileNameIn},
+		})
+		if err != nil {
+			t.Error(fmt.Sprintf("'%s' didn't expect error: %%w", fixturePath+fileNameIn), err)
+		} else {
+			JSONOut, _ := json.MarshalIndent(dataOut, "", "  ")
+			os.WriteFile(fixturePath+fileNameOut, JSONOut, 0o600)
+			JSONExpected, _ := os.ReadFile(fixturePath + fileNameExpected)
+			assert.JSONEq(t, string(JSONExpected), string(JSONOut),
+				"'%s': the JSON blobs should be equal", fixturePath+fileNameIn)
 		}
 	}
 }