1 files changed, 37 insertions, 0 deletions
diff --git a/internal/appconfig/config_env_model_test.go b/internal/appconfig/config_env_model_test.go
new file mode 100644
index 0000000..2db2bb5
--- /dev/null
+++ b/internal/appconfig/config_env_model_test.go
@@ -0,0 +1,37 @@
+package appconfig
+
+import (
+    "log"
+    "os"
+    "testing"
+)
+
+// Test that HEXAI_MODEL applies to provider model fields and that
+// provider-specific envs take precedence when both are set.
+func TestEnv_GenericModelOverrideAndPrecedence(t *testing.T) {
+    t.Setenv("HEXAI_MODEL", "gpt-5-codex")
+    t.Setenv("HEXAI_PROVIDER", "openai")
+    // No provider-specific env set yet: HEXAI_MODEL should flow into OpenAIModel
+    cfg := Load(log.New(os.Stderr, "test ", 0))
+    if cfg.OpenAIModel != "gpt-5-codex" {
+        t.Fatalf("expected OpenAIModel=gpt-5-codex via HEXAI_MODEL, got %q", cfg.OpenAIModel)
+    }
+
+    // Now set a provider-specific model; it should win over HEXAI_MODEL
+    t.Setenv("HEXAI_OPENAI_MODEL", "gpt-5-thinking")
+    cfg2 := Load(log.New(os.Stderr, "test ", 0))
+    if cfg2.OpenAIModel != "gpt-5-thinking" {
+        t.Fatalf("expected OpenAIModel from HEXAI_OPENAI_MODEL to win, got %q", cfg2.OpenAIModel)
+    }
+}
+
+// Test that HEXAI_MODEL_FORCE overrides provider-specific envs (used by CLI --model).
+func TestEnv_ModelForce_OverridesProviderSpecific(t *testing.T) {
+    t.Setenv("HEXAI_OPENAI_MODEL", "gpt-5-main")
+    t.Setenv("HEXAI_MODEL_FORCE", "gpt-5-codex")
+    t.Setenv("HEXAI_PROVIDER", "openai")
+    cfg := Load(log.New(os.Stderr, "test ", 0))
+    if cfg.OpenAIModel != "gpt-5-codex" {
+        t.Fatalf("expected OpenAIModel forced to gpt-5-codex, got %q", cfg.OpenAIModel)
+    }
+}