adding merge printer tests

test/internalpkg/printertest/printertest.go

@@ -8,6 +8,11 @@ import (
 	"github.com/thecodingmachine/gotenberg/internal/pkg/xrand"
 )
 
+/*
+testdataDirectoryPath should be
+the absolute of the testdata INSIDE
+the Docker image.
+*/
 const testdataDirectoryPath string = "/gotenberg/tests/test/testdata"
 
 // GenerateDestination simply generates
@@ -16,6 +21,15 @@ func GenerateDestination() string {
 	return fmt.Sprintf("/tmp/%s.pdf", xrand.Get())
 }
 
+// MergeFpaths return the paths
+// of the PDF files used in tests.
+func MergeFpaths(t *testing.T) []string {
+	return []string{
+		fpath(t, "pdf", "gotenberg.pdf"),
+		fpath(t, "pdf", "gotenberg_bis.pdf"),
+	}
+}
+
 // OfficeFpaths return the paths
 // of the Office documents used in tests.
 func OfficeFpaths(t *testing.T) []string {