From d5547781465f5034bfd5969460209e56fce57d35 Mon Sep 17 00:00:00 2001
From: James Prior <jamesgr.prior@gmail.com>
Date: Wed, 27 Dec 2023 15:00:03 +0000
Subject: [PATCH] Tests functions that return special nothing

---
 cts.json                    | 46 +++++++++++++++++++++++++++++++++++++
 tests/filter.json           | 16 +++++++++++++
 tests/functions/length.json | 12 ++++++++++
 3 files changed, 74 insertions(+)

diff --git a/cts.json b/cts.json
index 34bad52..11af641 100644
--- a/cts.json
+++ b/cts.json
@@ -2397,6 +2397,32 @@
         }
       ]
     },
+    {
+      "name": "filter, equals, special nothing",
+      "selector": "$.values[?length(@.a) == value($..c)]",
+      "document": {
+        "c": "cd",
+        "values": [
+          {
+            "a": "ab"
+          },
+          {
+            "c": "d"
+          },
+          {
+            "a": null
+          }
+        ]
+      },
+      "result": [
+        {
+          "c": "d"
+        },
+        {
+          "a": null
+        }
+      ]
+    },
     {
       "name": "index selector, first element",
       "selector": "$[0]",
@@ -4110,6 +4136,26 @@
         }
       ]
     },
+    {
+      "name": "functions, length, arg is special nothing",
+      "selector": "$[?length(value(@.a))>0]",
+      "document": [
+        {
+          "a": "ab"
+        },
+        {
+          "c": "d"
+        },
+        {
+          "a": null
+        }
+      ],
+      "result": [
+        {
+          "a": "ab"
+        }
+      ]
+    },
     {
       "name": "functions, match, found match",
       "selector": "$[?match(@.a, 'a.*')]",
diff --git a/tests/filter.json b/tests/filter.json
index c42160a..519bf21 100644
--- a/tests/filter.json
+++ b/tests/filter.json
@@ -770,6 +770,22 @@
       "result": [
         {"a": 0.011, "d": "e"}
       ]
+    },
+    {
+      "name": "equals, special nothing",
+      "selector" : "$.values[?length(@.a) == value($..c)]",
+      "document" : {
+        "c": "cd",
+        "values": [
+          {"a": "ab"},
+          {"c": "d"},
+          {"a": null}
+        ]
+      },
+      "result": [
+        {"c": "d"},
+        {"a": null}
+      ]
     }
   ]
 }
diff --git a/tests/functions/length.json b/tests/functions/length.json
index 7213298..9382c2e 100644
--- a/tests/functions/length.json
+++ b/tests/functions/length.json
@@ -82,6 +82,18 @@
       "result": [
         {"a": "ab"}
       ]
+    },
+    {
+      "name": "arg is special nothing",
+      "selector" : "$[?length(value(@.a))>0]",
+      "document" : [
+          {"a": "ab"},
+          {"c": "d"},
+          {"a": null}
+      ],
+      "result": [
+        {"a": "ab"}
+      ]
     }
   ]
 }