adding first tests + small refactoring for tests

app/app_test.go

@@ -0,0 +1,30 @@
+package app
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestNewApp(t *testing.T) {
+	// case 1: uses an empty configuration file path.
+	if _, err := NewApp("tests", ""); err == nil {
+		t.Error("App should not have been instantiated!")
+	}
+
+	// case 2: uses an correct configuration file.
+	path, _ := filepath.Abs("../_tests/configurations/gotenberg.yml")
+	if _, err := NewApp("tests", path); err != nil {
+		t.Error("App should have been instantiated!")
+	}
+}
+
+func TestRun(t *testing.T) {
+	path, _ := filepath.Abs("../_tests/configurations/gotenberg.yml")
+	a, _ := NewApp("tests", path)
+
+	quit := make(chan bool, 1)
+	go func() {
+		a.Run()
+	}()
+	quit <- true
+}