(fix): fern add with a new --group works (#3602)

packages/cli/configuration/src/generators-yml/updateGeneratorGroup.ts

@@ -20,10 +20,13 @@ export async function updateGeneratorGroup({
         return context.failAndThrow("No group specified.");
     }
     const groups = (generatorsConfiguration.groups ??= {});
-    for (const groupName of Object.keys(groups)) {
+
+    const group = groups[groupName];
+    if (group == null) {
         const draftGroup = (groups[groupName] ??= { generators: [] });
         await update(draftGroup, groupName);
+    } else {
+        await update(group, groupName);
     }
-
     return generatorsConfiguration;
 }

packages/cli/ete-tests/src/tests/add/__snapshots__/add.test.ts.snap

@@ -0,0 +1,117 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`fern add fern add <generator> --group sdk 1`] = `
+[
+  {
+    "contents": [
+      {
+        "contents": [
+          {
+            "contents": "name: api
+error-discrimination:
+  strategy: status-code
+",
+            "name": "api.yml",
+            "type": "file",
+          },
+          {
+            "contents": "# yaml-language-server: $schema=https://raw.githubusercontent.com/fern-api/fern/main/fern.schema.json
+
+service:
+  auth: false
+  base-path: /movies
+  endpoints:
+    createMovie:
+      docs: Add a movie to the database
+      method: POST
+      path: /create-movie
+      request: CreateMovieRequest
+      response: MovieId
+
+    getMovie:
+      docs: Retrieve a movie from the database based on the ID
+      method: GET
+      path: /{id}
+      path-parameters:
+        id: MovieId
+      response: Movie
+      errors:
+        - MovieDoesNotExistError
+      examples:
+        # Success response
+        - path-parameters:
+            id: tt0111161
+          response:
+            body:
+              id: tt0111161
+              title: The Shawshank Redemption
+              rating: 9.3
+        # Error response
+        - path-parameters:
+            id: tt1234
+          response:
+            error: MovieDoesNotExistError
+            body: tt1234
+
+types:
+  MovieId:
+    type: string
+    docs: The unique identifier for a Movie in the database
+
+  Movie:
+    properties:
+      id: MovieId
+      title: string
+      rating:
+        type: double
+        docs: The rating scale out of ten stars
+
+  CreateMovieRequest:
+    properties:
+      title: string
+      rating: double
+
+errors:
+  MovieDoesNotExistError:
+    status-code: 404
+    type: MovieId
+",
+            "name": "imdb.yml",
+            "type": "file",
+          },
+        ],
+        "name": "definition",
+        "type": "directory",
+      },
+      {
+        "contents": "{
+    "organization": "fern",
+    "version": "0.0.0"
+}",
+        "name": "fern.config.json",
+        "type": "file",
+      },
+      {
+        "contents": "default-group: local
+groups:
+  local:
+    generators:
+      - name: fernapi/fern-typescript-node-sdk
+        version: 0.9.5
+        output:
+          location: local-file-system
+          path: ../sdks/typescript
+  typescript:
+    generators:
+      - name: fernapi/fern-typescript
+        version: 0.7.2
+",
+        "name": "generators.yml",
+        "type": "file",
+      },
+    ],
+    "name": "fern",
+    "type": "directory",
+  },
+]
+`;

packages/cli/ete-tests/src/tests/add/add.test.ts

@@ -17,4 +17,18 @@ describe("fern add", () => {
 
         expect(await getDirectoryContents(pathOfDirectory)).not.toBeNull();
     }, 60_000);
+
+    it("fern add <generator> --group sdk", async () => {
+        const pathOfDirectory = await init();
+
+        const add = async (generator: string, groupName: string) => {
+            await runFernCli(["add", generator, "--group", groupName], {
+                cwd: pathOfDirectory
+            });
+        };
+
+        await add("fern-typescript", "typescript");
+
+        expect(await getDirectoryContents(pathOfDirectory)).toMatchSnapshot();
+    }, 60_000);
 });