fix(core): Allow model to be set from `settings.json` (#5527)

1 files changed, 62 insertions, 0 deletions

diff --git a/packages/cli/src/config/config.test.ts b/packages/cli/src/config/config.test.ts
index d8d463c2..431b1375 100644
--- a/packages/cli/src/config/config.test.ts
+++ b/packages/cli/src/config/config.test.ts
@@ -917,6 +917,68 @@ describe('loadCliConfig extensions', () => {
   });
 });
 
+describe('loadCliConfig model selection', () => {
+  it('selects a model from settings.json if provided', async () => {
+    process.argv = ['node', 'script.js'];
+    const argv = await parseArguments();
+    const config = await loadCliConfig(
+      {
+        model: 'gemini-9001-ultra',
+      },
+      [],
+      'test-session',
+      argv,
+    );
+
+    expect(config.getModel()).toBe('gemini-9001-ultra');
+  });
+
+  it('uses the default gemini model if nothing is set', async () => {
+    process.argv = ['node', 'script.js']; // No model set.
+    const argv = await parseArguments();
+    const config = await loadCliConfig(
+      {
+        // No model set.
+      },
+      [],
+      'test-session',
+      argv,
+    );
+
+    expect(config.getModel()).toBe('gemini-2.5-pro');
+  });
+
+  it('always prefers model from argvs', async () => {
+    process.argv = ['node', 'script.js', '--model', 'gemini-8675309-ultra'];
+    const argv = await parseArguments();
+    const config = await loadCliConfig(
+      {
+        model: 'gemini-9001-ultra',
+      },
+      [],
+      'test-session',
+      argv,
+    );
+
+    expect(config.getModel()).toBe('gemini-8675309-ultra');
+  });
+
+  it('selects the model from argvs if provided', async () => {
+    process.argv = ['node', 'script.js', '--model', 'gemini-8675309-ultra'];
+    const argv = await parseArguments();
+    const config = await loadCliConfig(
+      {
+        // No model provided via settings.
+      },
+      [],
+      'test-session',
+      argv,
+    );
+
+    expect(config.getModel()).toBe('gemini-8675309-ultra');
+  });
+});
+
 describe('loadCliConfig ideModeFeature', () => {
   const originalArgv = process.argv;
   const originalEnv = { ...process.env };