diff --git a/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.test.ts b/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.test.ts
new file mode 100644
index 0000000000000..b77f1fa77a1bb
--- /dev/null
+++ b/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.test.ts
@@ -0,0 +1,61 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { Integration } from '../../common';
+import { renderPackageManifestYAML } from './build_integration';
+import yaml from 'js-yaml';
+
+describe('renderPackageManifestYAML', () => {
+  test('generates the package manifest correctly', () => {
+    const integration: Integration = {
+      title: 'Sample Integration',
+      name: 'sample-integration',
+      description:
+        '  This is a sample integration\n\nWith multiple lines   and    weird  spacing. \n\n  And more lines  ',
+      logo: 'some-logo.png',
+      dataStreams: [
+        {
+          name: 'data-stream-1',
+          title: 'Data Stream 1',
+          description: 'This is data stream 1',
+          inputTypes: ['filestream'],
+          rawSamples: ['{field: "value"}'],
+          pipeline: {
+            processors: [],
+          },
+          docs: [],
+          samplesFormat: { name: 'ndjson', multiline: false },
+        },
+        {
+          name: 'data-stream-2',
+          title: 'Data Stream 2',
+          description:
+            'This is data stream 2\nWith multiple lines of description\nBut otherwise, nothing special',
+          inputTypes: ['aws-cloudwatch'],
+          pipeline: {
+            processors: [],
+          },
+          rawSamples: ['field="value"'],
+          docs: [],
+          samplesFormat: { name: 'structured' },
+        },
+      ],
+    };
+
+    const manifestContent = renderPackageManifestYAML(integration);
+
+    // The manifest content must be parseable as YAML.
+    const manifest = yaml.safeLoad(manifestContent);
+
+    expect(manifest).toBeDefined();
+    expect(manifest.title).toBe(integration.title);
+    expect(manifest.name).toBe(integration.name);
+    expect(manifest.type).toBe('integration');
+    expect(manifest.description).toBe(integration.description);
+    expect(manifest.icons).toBeTruthy();
+  });
+});
diff --git a/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.ts b/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.ts
index 62972f6141c64..73113f6bf7b04 100644
--- a/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.ts
+++ b/x-pack/plugins/integration_assistant/server/integration_builder/build_integration.ts
@@ -9,6 +9,7 @@ import AdmZip from 'adm-zip';
 import nunjucks from 'nunjucks';
 import { getDataPath } from '@kbn/utils';
 import { join as joinPath } from 'path';
+import { safeDump } from 'js-yaml';
 import type { DataStream, Integration } from '../../common';
 import { createSync, ensureDirSync, generateUniqueId, removeDirSync } from '../util';
 import { createAgentInput } from './agent';
@@ -18,7 +19,7 @@ import { createPipeline } from './pipeline';
 
 const initialVersion = '1.0.0';
 
-export async function buildPackage(integration: Integration): Promise<Buffer> {
+function configureNunjucks() {
   const templateDir = joinPath(__dirname, '../templates');
   const agentTemplates = joinPath(templateDir, 'agent');
   const manifestTemplates = joinPath(templateDir, 'manifest');
@@ -26,6 +27,10 @@ export async function buildPackage(integration: Integration): Promise<Buffer> {
   nunjucks.configure([templateDir, agentTemplates, manifestTemplates, systemTestTemplates], {
     autoescape: false,
   });
+}
+
+export async function buildPackage(integration: Integration): Promise<Buffer> {
+  configureNunjucks();
 
   const workingDir = joinPath(getDataPath(), `integration-assistant-${generateUniqueId()}`);
   const packageDirectoryName = `${integration.name}-${initialVersion}`;
@@ -116,7 +121,82 @@ async function createZipArchive(workingDir: string, packageDirectoryName: string
   return buffer;
 }
 
-function createPackageManifest(packageDir: string, integration: Integration): void {
+/* eslint-disable @typescript-eslint/naming-convention */
+/**
+ * Creates a package manifest dictionary.
+ *
+ * @param format_version - The format version of the package.
+ * @param package_title - The title of the package.
+ * @param package_name - The name of the package.
+ * @param package_version - The version of the package.
+ * @param package_description - The description of the package.
+ * @param package_logo - The package logo file name, if present.
+ * @param package_owner - The owner of the package.
+ * @param min_version - The minimum version of Kibana required for the package.
+ * @param inputs - An array of unique input objects containing type, title, and description.
+ * @returns The package manifest dictionary.
+ */
+function createPackageManifestDict(
+  format_version: string,
+  package_title: string,
+  package_name: string,
+  package_version: string,
+  package_description: string,
+  package_logo: string | undefined,
+  package_owner: string,
+  min_version: string,
+  inputs: Array<{ type: string; title: string; description: string }>
+): { [key: string]: string | object } {
+  const data: { [key: string]: string | object } = {
+    format_version,
+    name: package_name,
+    title: package_title,
+    version: package_version,
+    description: package_description,
+    type: 'integration',
+    categories: ['security', 'iam'],
+    conditions: {
+      kibana: {
+        version: min_version,
+      },
+    },
+    policy_templates: [
+      {
+        name: package_name,
+        title: package_title,
+        description: package_description,
+        inputs: inputs.map((input) => ({
+          type: input.type,
+          title: `${input.title} : ${input.type}`,
+          description: input.description,
+        })),
+      },
+    ],
+    owner: {
+      github: package_owner,
+      type: 'elastic',
+    },
+  };
+
+  if (package_logo !== undefined && package_logo !== '') {
+    data.icons = {
+      src: '/img/logo.svg',
+      title: `${package_title} Logo`,
+      size: '32x32',
+      type: 'image/svg+xml',
+    };
+  }
+  return data;
+}
+/* eslint-enable @typescript-eslint/naming-convention */
+
+/**
+ * Render the package manifest for an integration.
+ *
+ * @param integration - The integration object.
+ * @returns The package manifest YAML rendered into a string.
+ */
+export function renderPackageManifestYAML(integration: Integration): string {
   const uniqueInputs: { [key: string]: { type: string; title: string; description: string } } = {};
 
   integration.dataStreams.forEach((dataStream: DataStream) => {
@@ -133,17 +213,22 @@ function createPackageManifest(packageDir: string, integration: Integration): vo
 
   const uniqueInputsList = Object.values(uniqueInputs);
 
-  const packageManifest = nunjucks.render('package_manifest.yml.njk', {
-    format_version: '3.1.4',
-    package_title: integration.title,
-    package_name: integration.name,
-    package_version: initialVersion,
-    package_description: integration.description,
-    package_logo: integration.logo,
-    package_owner: '@elastic/custom-integrations',
-    min_version: '^8.13.0',
-    inputs: uniqueInputsList,
-  });
+  const packageData = createPackageManifestDict(
+    '3.1.4', // format_version
+    integration.title, // package_title
+    integration.name, // package_name
+    initialVersion, // package_version
+    integration.description, // package_description
+    integration.logo, // package_logo
+    '@elastic/custom-integrations', // package_owner
+    '^8.13.0', // min_version
+    uniqueInputsList // inputs
+  );
+
+  return safeDump(packageData);
+}
 
+function createPackageManifest(packageDir: string, integration: Integration): void {
+  const packageManifest = renderPackageManifestYAML(integration);
   createSync(joinPath(packageDir, 'manifest.yml'), packageManifest);
 }
diff --git a/x-pack/plugins/integration_assistant/server/templates/manifest/package_manifest.yml.njk b/x-pack/plugins/integration_assistant/server/templates/manifest/package_manifest.yml.njk
deleted file mode 100644
index fa7b8d8c66266..0000000000000
--- a/x-pack/plugins/integration_assistant/server/templates/manifest/package_manifest.yml.njk
+++ /dev/null
@@ -1,34 +0,0 @@
-format_version: "{{ format_version }}"
-name: "{{ package_name }}"
-title: |
-  {{ package_title }}
-version: {{ package_version }}
-description: |
-  {{ package_description }}
-type: integration
-categories:
-  - security
-  - iam
-conditions:
-  kibana:
-    version: {{ min_version }}
-{% if package_logo %}icons:
-  - src: /img/logo.svg
-    title: "{{ package_name }} Logo"
-    size: 32x32
-    type: image/svg+xml{% endif %}
-policy_templates:
-  - name: {{ package_name }}
-    title: |
-      {{ package_title }}
-    description: |
-      {{ package_description}}
-    inputs: {% for input in inputs %}
-      - type: {{ input.type }}
-        title: |
-          {{ input.title }} : {{ input.type }}
-        description: |
-          {{ input.description }} {% endfor %}
-owner:
-  github: "{{ package_owner }}"
-  type: elastic
\ No newline at end of file