mocks: init fs index file.

src/__mocks__/fs/index.ts

@@ -0,0 +1,54 @@
+import {expect} from '@jest/globals';
+
+import * as YAML from 'js-yaml';
+
+export const readFile = async (_filePath: string, _format: string) => {
+  return `
+  name: gsf-demo
+  description: 
+    Hello
+  tags:
+    kind: web
+    complexity: moderate
+    category: cloud
+  initialize:
+    models:
+      - name: boavizta-cpu
+        kind: builtin
+        config:
+          allocation: LINEAR
+          verbose: true
+  graph:
+    children:
+      front-end:
+        pipeline: 
+          - boavizta-cpu
+        config:
+          boavizta-cpu:
+            core-units: 24
+            processor: Intel® Core™ i7-1185G7
+        observations:
+          - timestamp: 2023-07-06T00:00 # [KEYWORD] [NO-SUBFIELDS] time when measurement occurred
+            duration: 3600 # Secs
+            cpu-util: 18.392
+          - timestamp: 2023-08-06T00:00 # [KEYWORD] [NO-SUBFIELDS] time when measurement occurred
+            duration: 3600 # Secs
+            cpu-util: 16`;
+};
+
+export const mkdir = (dirPath: string, _object: any) => dirPath;
+
+export const writeFile = async (pathToFile: string, content: string) => {
+  if (pathToFile === 'reject') {
+    throw Error('Wrong file path');
+  }
+
+  const mockPathToFile = 'mock-pathToFile';
+  const mockContent = {
+    name: 'mock-name',
+  };
+  const mockObject = YAML.dump(mockContent, {noRefs: true});
+
+  expect(pathToFile).toBe(mockPathToFile);
+  expect(content).toBe(mockObject);
+};