feat: scaffold go backend foundation

internal/config/config_test.go

@@ -0,0 +1,52 @@
+package config
+
+import "testing"
+
+func TestLoadFromEnvDefaults(t *testing.T) {
+	t.Setenv("TUTOR_HTTP_ADDR", "")
+	t.Setenv("TUTOR_ENV", "")
+	t.Setenv("TUTOR_WORKFLOW_RUNTIME", "")
+	t.Setenv("TUTOR_MODEL_KEY", "")
+	t.Setenv("THIRDONE_BIN", "")
+
+	cfg := LoadFromEnv()
+
+	if cfg.HTTPAddr != defaultHTTPAddr {
+		t.Fatalf("HTTPAddr = %q, want %q", cfg.HTTPAddr, defaultHTTPAddr)
+	}
+	if cfg.Environment != defaultEnvironment {
+		t.Fatalf("Environment = %q, want %q", cfg.Environment, defaultEnvironment)
+	}
+	if cfg.ModelKey != defaultModelKey {
+		t.Fatalf("ModelKey = %q, want %q", cfg.ModelKey, defaultModelKey)
+	}
+	if cfg.ThirdOneBin != defaultThirdOneBin {
+		t.Fatalf("ThirdOneBin = %q, want %q", cfg.ThirdOneBin, defaultThirdOneBin)
+	}
+}
+
+func TestLoadFromEnvOverrides(t *testing.T) {
+	t.Setenv("TUTOR_HTTP_ADDR", ":9090")
+	t.Setenv("TUTOR_ENV", "test")
+	t.Setenv("TUTOR_WORKFLOW_RUNTIME", "runtime.yaml")
+	t.Setenv("TUTOR_MODEL_KEY", "other-model")
+	t.Setenv("THIRDONE_BIN", "C:/bin/thirdone.exe")
+
+	cfg := LoadFromEnv()
+
+	if cfg.HTTPAddr != ":9090" {
+		t.Fatalf("HTTPAddr = %q", cfg.HTTPAddr)
+	}
+	if cfg.Environment != "test" {
+		t.Fatalf("Environment = %q", cfg.Environment)
+	}
+	if cfg.WorkflowRuntime != "runtime.yaml" {
+		t.Fatalf("WorkflowRuntime = %q", cfg.WorkflowRuntime)
+	}
+	if cfg.ModelKey != "other-model" {
+		t.Fatalf("ModelKey = %q", cfg.ModelKey)
+	}
+	if cfg.ThirdOneBin != "C:/bin/thirdone.exe" {
+		t.Fatalf("ThirdOneBin = %q", cfg.ThirdOneBin)
+	}
+}