Added test for util.printx() and make it match spec.

testing/resources/javascript/util_printx.in

Index: testing/resources/javascript/util_printx.in
diff --git a/testing/resources/javascript/util_printx.in b/testing/resources/javascript/util_printx.in
new file mode 100644
index 0000000000000000000000000000000000000000..7085edc3ea43b15f404e7066977dfce9141e2351
--- /dev/null
+++ b/testing/resources/javascript/util_printx.in
@@ -0,0 +1,88 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+  /OpenAction 10 0 R
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [
+    3 0 R
+  ]
+>>
+endobj
+% Page number 0.
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <</F1 15 0 R>>
+  >>
+  /Contents [21 0 R]
+  /MediaBox [0 0 612 792]
+>>
+% OpenAction action
+{{object 10 0}} <<
+  /Type /Action
+  /S /JavaScript
+  /JS 11 0 R
+>>
+endobj
+% JS program to exexute
+{{object 11 0}} <<
+>>
+stream
+function TestOneFormat(fmt, src) {
+  var title = "('" + fmt + "', '" + src + "')";
+  try {
+    app.alert(title +  " => '" + util.printx(fmt, src) + "'");
+  }
+  catch (e) {
+    app.alert(title + ": Caught error: " + e);
+  }
+}
+TestOneFormat("", "");
+TestOneFormat("", "123");
+TestOneFormat("??", "");
+TestOneFormat("??", "f2");
+TestOneFormat("??", "f27");
+TestOneFormat("XXX", "");
+TestOneFormat("XXX", "1afp3.");
+TestOneFormat("XXX", "-1Afp3.d33F$");
+TestOneFormat("AAA", "");
+TestOneFormat("AAA", "-1Afp3.");
+TestOneFormat("AAA", "-1Afp3.d33F$");
+TestOneFormat("999", "");
+TestOneFormat("999", "-1Afp3.");
+TestOneFormat("999", "-1Afp3.d33F$");
+TestOneFormat("9*9", "");
+TestOneFormat("9*9", "-1Afp3.");
+TestOneFormat("[*]X", "-1Afp3.");
+TestOneFormat("<*", "-1Afp3.d33F$");
+TestOneFormat(">*", "-1Afp3.d33F$");
+TestOneFormat("<[AAAAAAAAAAA]", "-1Afp3.d33F$");
+TestOneFormat(">[AAAAAAAAAAA]", "-1Afp3.d33F$");
+TestOneFormat("<[XXXXXXXXXXX]", "-1Afp3.d33F$");
+TestOneFormat(">[XXXXXXXXXXX]", "-1Afp3.d33F$");
+TestOneFormat("<[XXXXXXXXXXX]", "-1Afp3.d33F$");
+TestOneFormat(">[???????????]", "-1Afp3.d33F$");
+TestOneFormat("<[???????????]", "-1Afp3.d33F$");
+TestOneFormat("\\>[\\**]", "-1Afp3.d33F$");
+TestOneFormat("\\>[\\\\**]", "-1Afp3.d33F$");
+TestOneFormat("=*", "-1Afp3.d33F$");
+TestOneFormat("<??????=*", "-1Afp3.d33F$");
+TestOneFormat(">??????=*", "-1Afp3.d33F$");
+TestOneFormat(">??????<*", "-1Afp3.d33F$");
+TestOneFormat("clams", "-1Afp3.d33F$");
+TestOneFormat("cl9ms", "-1Afp3.d33F$");
+TestOneFormat("cl\\9ms", "-1Afp3.d33F$");
+endstream
+endobj
+{{xref}}
+trailer <<
+  /Root 1 0 R
+>>
+{{startxref}}
+%%EOF