feat(infra): funciones impuras Go para carga de env/config (dotenv, env_require, config_from_env, config_from_file)

- dotenv_load: parser .env con no-sobreescritura y soporte de comillas - env_require: os.Getenv con error descriptivo fail-fast - env_require_all: verifica multiples vars y lista todas las faltantes - config_from_env: reflection sobre struct tags env/default/required/secret, 5 tipos soportados - config_from_file: JSON via stdlib, YAML stub con not-implemented - 25 tests unitarios, todos PASS Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-13 02:01:50 +02:00
parent c3b007a4e7
commit ebf246beb0
14 changed files with 888 additions and 0 deletions
@@ -0,0 +1,97 @@
+package infra
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestDotenvLoad(t *testing.T) {
+	// helper to write a temp .env file
+	writeEnv := func(t *testing.T, content string) string {
+		t.Helper()
+		dir := t.TempDir()
+		p := filepath.Join(dir, ".env")
+		if err := os.WriteFile(p, []byte(content), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		return p
+	}
+
+	t.Run("parsea KEY=VALUE y setea variable", func(t *testing.T) {
+		p := writeEnv(t, "DOTENV_TEST_FOO=hello\n")
+		t.Setenv("DOTENV_TEST_FOO", "") // ensure unset
+		os.Unsetenv("DOTENV_TEST_FOO")
+
+		if err := DotenvLoad(p); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got := os.Getenv("DOTENV_TEST_FOO"); got != "hello" {
+			t.Errorf("expected DOTENV_TEST_FOO=hello, got %q", got)
+		}
+	})
+
+	t.Run("ignora lineas comentario y vacias", func(t *testing.T) {
+		content := "# this is a comment\n\nDOTENV_TEST_BAR=world\n"
+		p := writeEnv(t, content)
+		os.Unsetenv("DOTENV_TEST_BAR")
+
+		if err := DotenvLoad(p); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got := os.Getenv("DOTENV_TEST_BAR"); got != "world" {
+			t.Errorf("expected world, got %q", got)
+		}
+	})
+
+	t.Run("no sobreescribe variables ya seteadas", func(t *testing.T) {
+		p := writeEnv(t, "DOTENV_TEST_EXISTING=new\n")
+		t.Setenv("DOTENV_TEST_EXISTING", "original")
+
+		if err := DotenvLoad(p); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got := os.Getenv("DOTENV_TEST_EXISTING"); got != "original" {
+			t.Errorf("expected original (not overwritten), got %q", got)
+		}
+	})
+
+	t.Run("valores con comillas dobles se stripean", func(t *testing.T) {
+		p := writeEnv(t, `DOTENV_TEST_QUOTED="quoted value"`)
+		os.Unsetenv("DOTENV_TEST_QUOTED")
+
+		if err := DotenvLoad(p); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got := os.Getenv("DOTENV_TEST_QUOTED"); got != "quoted value" {
+			t.Errorf("expected 'quoted value', got %q", got)
+		}
+	})
+
+	t.Run("valores con comillas simples se stripean", func(t *testing.T) {
+		p := writeEnv(t, "DOTENV_TEST_SINGLE='single quoted'")
+		os.Unsetenv("DOTENV_TEST_SINGLE")
+
+		if err := DotenvLoad(p); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got := os.Getenv("DOTENV_TEST_SINGLE"); got != "single quoted" {
+			t.Errorf("expected 'single quoted', got %q", got)
+		}
+	})
+
+	t.Run("archivo inexistente retorna error", func(t *testing.T) {
+		err := DotenvLoad("/nonexistent/.env.does.not.exist")
+		if err == nil {
+			t.Error("expected error for missing file")
+		}
+	})
+
+	t.Run("linea sin signo igual retorna error", func(t *testing.T) {
+		p := writeEnv(t, "INVALID_LINE\n")
+		err := DotenvLoad(p)
+		if err == nil {
+			t.Error("expected error for line without '='")
+		}
+	})
+}