Add unit tests for getField()

x-pack/plugins/ingest_manager/server/services/epm/fields/field.test.ts

@@ -8,7 +8,7 @@ import { readFileSync } from 'fs';
 import glob from 'glob';
 import { safeLoad } from 'js-yaml';
 import path from 'path';
-import { Field, processFields } from './field';
+import { Field, Fields, getField, processFields } from './field';
 
 // Add our own serialiser to just do JSON.stringify
 expect.addSnapshotSerializer({
@@ -33,3 +33,50 @@ test('tests loading fields.yml', () => {
     expect(processedFields).toMatchSnapshot(path.basename(file));
   }
 });
+
+describe('getField searches recursively for nested field in fields given an array of path parts', () => {
+  const searchFields: Fields = [
+    {
+      name: '1',
+      fields: [
+        {
+          name: '1-1',
+        },
+        {
+          name: '1-2',
+        },
+      ],
+    },
+    {
+      name: '2',
+      fields: [
+        {
+          name: '2-1',
+        },
+        {
+          name: '2-2',
+          fields: [
+            {
+              name: '2-2-1',
+            },
+            {
+              name: '2-2-2',
+            },
+          ],
+        },
+      ],
+    },
+  ];
+  test('returns undefined when the field does not exist', () => {
+    expect(getField(searchFields, ['0'])).toBe(undefined);
+  });
+  test('returns undefined if the field is not a leaf node', () => {
+    expect(getField(searchFields, ['1'])?.name).toBe(undefined);
+  });
+  test('returns undefined searching for a nested field that does not exist', () => {
+    expect(getField(searchFields, ['1', '1-3'])?.name).toBe(undefined);
+  });
+  test('returns nested field that is a leaf node', () => {
+    expect(getField(searchFields, ['2', '2-2', '2-2-1'])?.name).toBe('2-2-1');
+  });
+});

x-pack/plugins/ingest_manager/server/services/epm/fields/field.ts

@@ -151,7 +151,7 @@ function validateAliasFields(fields: Fields, allFields: Fields): Fields {
   return validatedFields;
 }
 
-const getField = (fields: Fields, pathNames: string[]): Field | undefined => {
+export const getField = (fields: Fields, pathNames: string[]): Field | undefined => {
   if (!pathNames.length) return undefined;
   // get the first rest of path names
   const [name, ...restPathNames] = pathNames;