1 files changed, 38 insertions, 1 deletions
diff --git a/spec/frontend/graphql_shared/utils_spec.js b/spec/frontend/graphql_shared/utils_spec.js
index 6a630195126..d392b0f0575 100644
--- a/spec/frontend/graphql_shared/utils_spec.js
+++ b/spec/frontend/graphql_shared/utils_spec.js
@@ -1,4 +1,12 @@
-import { getIdFromGraphQLId } from '~/graphql_shared/utils';
+import {
+  getIdFromGraphQLId,
+  convertToGraphQLId,
+  convertToGraphQLIds,
+} from '~/graphql_shared/utils';
+
+const mockType = 'Group';
+const mockId = 12;
+const mockGid = `gid://gitlab/Group/12`;
 
 describe('getIdFromGraphQLId', () => {
   [
@@ -44,3 +52,32 @@ describe('getIdFromGraphQLId', () => {
     });
   });
 });
+
+describe('convertToGraphQLId', () => {
+  it('combines $type and $id into $result', () => {
+    expect(convertToGraphQLId(mockType, mockId)).toBe(mockGid);
+  });
+
+  it.each`
+    type        | id        | message
+    ${mockType} | ${null}   | ${'id must be a number or string; got object'}
+    ${null}     | ${mockId} | ${'type must be a string; got object'}
+  `('throws TypeError with "$message" if a param is missing', ({ type, id, message }) => {
+    expect(() => convertToGraphQLId(type, id)).toThrow(new TypeError(message));
+  });
+});
+
+describe('convertToGraphQLIds', () => {
+  it('combines $type and $id into $result', () => {
+    expect(convertToGraphQLIds(mockType, [mockId])).toStrictEqual([mockGid]);
+  });
+
+  it.each`
+    type        | ids               | message
+    ${mockType} | ${null}           | ${"Cannot read property 'map' of null"}
+    ${mockType} | ${[mockId, null]} | ${'id must be a number or string; got object'}
+    ${null}     | ${[mockId]}       | ${'type must be a string; got object'}
+  `('throws TypeError with "$message" if a param is missing', ({ type, ids, message }) => {
+    expect(() => convertToGraphQLIds(type, ids)).toThrow(new TypeError(message));
+  });
+});