feat: unit tests

Signed-off-by: skidoodle <contact@albert.lol>

internal/app/config_test.go

@@ -0,0 +1,37 @@
+package app
+
+import (
+	"testing"
+)
+
+func TestGetEnv(t *testing.T) {
+	key := "SAFEBIN_TEST_KEY"
+	val := "somevalue"
+
+	if got := getEnv(key, "default"); got != "default" {
+		t.Errorf("Expected default, got %s", got)
+	}
+
+	t.Setenv(key, val)
+	if got := getEnv(key, "default"); got != val {
+		t.Errorf("Expected %s, got %s", val, got)
+	}
+}
+
+func TestGetEnvInt(t *testing.T) {
+	key := "SAFEBIN_TEST_INT"
+
+	if got := getEnvInt(key, 8080); got != 8080 {
+		t.Errorf("Expected default 8080, got %d", got)
+	}
+
+	t.Setenv(key, "9090")
+	if got := getEnvInt(key, 8080); got != 9090 {
+		t.Errorf("Expected 9090, got %d", got)
+	}
+
+	t.Setenv(key, "notanumber")
+	if got := getEnvInt(key, 8080); got != 8080 {
+		t.Errorf("Expected fallback on invalid input, got %d", got)
+	}
+}