1 files changed, 39 insertions, 0 deletions
diff --git a/internal/hexaicli/run_model_override_test.go b/internal/hexaicli/run_model_override_test.go
new file mode 100644
index 0000000..6394bd1
--- /dev/null
+++ b/internal/hexaicli/run_model_override_test.go
@@ -0,0 +1,39 @@
+package hexaicli
+
+import (
+    "bytes"
+    "context"
+    "strings"
+    "testing"
+
+    "codeberg.org/snonux/hexai/internal/appconfig"
+    "codeberg.org/snonux/hexai/internal/llm"
+)
+
+type fakeClientModelEnv struct{ name, model string }
+func (f fakeClientModelEnv) Chat(_ context.Context, _ []llm.Message, _ ...llm.RequestOption) (string, error) { return "ok", nil }
+func (f fakeClientModelEnv) Name() string         { return f.name }
+func (f fakeClientModelEnv) DefaultModel() string { return f.model }
+
+// Ensure that HEXAI_MODEL overrides config for CLI runs.
+func TestRun_ModelEnvOverride_FlowsIntoClient(t *testing.T) {
+    t.Setenv("HEXAI_MODEL", "gpt-5-codex")
+    t.Setenv("HEXAI_PROVIDER", "openai")
+    // Replace client constructor to assert model was overridden
+    oldNew := newClientFromApp
+    defer func() { newClientFromApp = oldNew }()
+	newClientFromApp = func(cfg appconfig.App) (llm.Client, error) {
+		if strings.TrimSpace(cfg.OpenAIModel) != "gpt-5-codex" {
+			t.Fatalf("expected cfg.OpenAIModel=gpt-5-codex, got %q", cfg.OpenAIModel)
+		}
+        return fakeClientModelEnv{name: "openai", model: cfg.OpenAIModel}, nil
+    }
+
+    var out, errb bytes.Buffer
+    if err := Run(context.Background(), []string{"hello"}, strings.NewReader(""), &out, &errb); err != nil {
+        t.Fatalf("run error: %v", err)
+    }
+    if !strings.Contains(errb.String(), "model=gpt-5-codex") {
+        t.Fatalf("stderr should print effective model, got: %s", errb.String())
+    }
+}