Add if/then/else test cases for issue #767

tests/draft2019-09/if-then-else.json

@@ -264,5 +264,69 @@
                 "valid": false
             }
         ]
-    }
+    },
+    {
+        "description": "then: false should fail if condition matches",
+        "schema": {
+            "if": { "const": 1 },
+            "then": false
+        },
+        "tests": [
+            {
+                "description": "matches if → then=false → invalid",
+                "data": 1,
+                "valid": false
+            },
+            {
+                "description": "does not match if → then ignored → valid",
+                "data": 2,
+                "valid": true
+            }
+        ]
+    },
+    {
+        "description": "else: false should fail when if condition does not match",
+        "schema": {
+            "if": {
+                "properties":{
+                    "name":{"type":"string"}
+                },
+                "required": ["name"]
+            },
+            "else": false
+        },
+        "tests": [
+            {
+                "description": "does not match if → else executes → invalid",
+                "data": 2,
+                "valid": false
+            },
+            {
+                "description": "matches if → else does not execute → valid",
+                "data":{"name":"foo"},
+                "valid":true
+            }
+        ]
+    },
+    {
+        "description": "then and else both are false",
+        "schema":{
+            "if":{"type":"number"},
+            "then":false,
+            "else":false
+        },
+        "tests":[
+            {
+                "description": "matches if → then executes and else does not execute → invalid",
+                "data": 4,
+                "valid": false
+            },
+            {
+                "description": "does not match if → else executes → invalid",
+                "data": "foo",
+                "valid": false
+            }
+        ]
+    }      
 ]
+