diff --git a/src/sdl/SDL/SDL.spec.ts b/src/sdl/SDL/SDL.spec.ts
index bd4244a..15f9b10 100644
--- a/src/sdl/SDL/SDL.spec.ts
+++ b/src/sdl/SDL/SDL.spec.ts
@@ -1,6 +1,7 @@
 import { faker } from "@faker-js/faker";
 import template from "lodash/template";
 import omit from "lodash/omit";
+import { dump } from "js-yaml";
 
 import { readYml } from "../../../test/read-yml";
 import { SdlValidationError } from "../../error";
@@ -18,7 +19,7 @@ describe("SDL", () => {
         password: faker.internet.password()
       };
       const yml = createYML({
-        credentials: createCreds(credentials)
+        credentials: toYmlFragment({ credentials }, { nestingLevel: 2 })
       });
       const sdl = SDL.fromString(yml, "beta3", "sandbox");
 
@@ -53,7 +54,7 @@ describe("SDL", () => {
 
       it.each(fields)('should throw an error when credentials are missing "%s"', field => {
         const yml = createYML({
-          credentials: createCreds(omit(credentials, field))
+          credentials: toYmlFragment({ credentials: omit(credentials, field) }, { nestingLevel: 2 })
         });
 
         expect(() => {
@@ -64,7 +65,7 @@ describe("SDL", () => {
       it.each(fields)('should throw an error when credentials "%s" is empty', field => {
         credentials[field] = "";
         const yml = createYML({
-          credentials: createCreds(omit(credentials, field))
+          credentials: toYmlFragment({ credentials: omit(credentials, field) }, { nestingLevel: 2 })
         });
 
         expect(() => {
@@ -75,7 +76,7 @@ describe("SDL", () => {
       it.each(fields)('should throw an error when credentials "%s" contains spaces only', field => {
         credentials[field] = "   ";
         const yml = createYML({
-          credentials: createCreds(omit(credentials, field))
+          credentials: toYmlFragment({ credentials: omit(credentials, field) }, { nestingLevel: 2 })
         });
 
         expect(() => {
@@ -86,24 +87,20 @@ describe("SDL", () => {
   });
 });
 
-function createCreds({ host, username, password }: { host?: string; username?: string; password?: string }) {
-  let creds = "";
+type YmlInputObject = {
+  [key: string]: string | number | boolean | null | YmlInputObject;
+};
 
-  if (host) {
-    creds += `      host: "${host}"\n`;
-  }
-
-  if (username) {
-    creds += `      username: "${username}"\n`;
-  }
-
-  if (password) {
-    creds += `      password: "${password}"\n`;
-  }
+function toYmlFragment(object: YmlInputObject, options?: { nestingLevel: number }): string {
+  const yamlString = dump(object);
 
-  if (creds) {
-    creds = `    credentials:\n${creds}`;
+  if (!options) {
+    return yamlString;
   }
 
-  return creds;
+  const indentation = "  ".repeat(options.nestingLevel);
+  return yamlString
+    .split("\n")
+    .map(line => indentation + line)
+    .join("\n");
 }