From ba95ecf6e8557e2ff5eb5961a3581d6a907a3cab Mon Sep 17 00:00:00 2001
From: Martin van Harmelen <martin.van.harmelen@triply.cc>
Date: Thu, 22 Dec 2022 18:22:01 +0100
Subject: [PATCH] Add failing test for double inverse property path

---
 test/generation/PropertyPath-test.js | 31 ++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 test/generation/PropertyPath-test.js

diff --git a/test/generation/PropertyPath-test.js b/test/generation/PropertyPath-test.js
new file mode 100644
index 00000000..2f22cb7e
--- /dev/null
+++ b/test/generation/PropertyPath-test.js
@@ -0,0 +1,31 @@
+const SparqlParser = require('../../sparql').Parser;
+const SparqlGenerator = require('../../sparql').Generator;
+const expect = require('expect');
+
+describe('Property Path Support Test', function () {
+
+  it('should unparse double inverse property path', function () {
+    const query = `ASK WHERE { ?s ^(^<a:a>) ?o. }`;
+
+    const sparqlParser = new SparqlParser();
+    let selectQueryAST;
+    try {
+      selectQueryAST = sparqlParser.parse(query);
+    } catch (e) {
+      throw Error(`Could not parse "${query}" :\n${e}`);
+    }
+
+    const generator = new SparqlGenerator({});
+    let outputQueryString;
+    try {
+      outputQueryString = generator.stringify(selectQueryAST);
+    } catch (e) {
+      throw Error(`Could not generate "${JSON.parse(selectQueryAST, null, 2)}" :\n${e}`);
+    }
+
+    const trimedInputQuery = query.replace(/  /g, " ");
+    const trimedOutputQuery = outputQueryString.replace(/  /g, " ");
+
+    expect(trimedOutputQuery).toEqual(trimedInputQuery);
+  });
+});