word-search: Add cases checking for concatenation and wrapping

The author of this commit thinks that concatenation is highly unlikely,
but the wrapping might be useful to check in languages that allow
negative indices.

Author: petertseng

exercises/word-search/canonical-data.json

@@ -1024,6 +1024,61 @@
         "abf": null,
         "cbd": null
       }
+    },
+    {
+      "uuid": "5b6198eb-2847-4e2f-8efe-65045df16bd3",
+      "description": "Should not concatenate different lines to find a horizontal word",
+      "property": "search",
+      "input": {
+        "grid": [
+          "abceli",
+          "xirdfg"
+        ],
+        "wordsToSearchFor": [
+          "elixir"
+        ]
+      },
+      "expected": {
+        "elixir": null
+      }
+    },
+    {
+      "uuid": "eba44139-a34f-4a92-98e1-bd5f259e5769",
+      "description": "Should not wrap around horizontally to find a word",
+      "property": "search",
+      "input": {
+        "grid": [
+          "silabcdefp"
+        ],
+        "wordsToSearchFor": [
+          "lisp"
+        ]
+      },
+      "expected": {
+        "lisp": null
+      }
+    },
+    {
+      "uuid": "cd1f0fa8-76af-4167-b105-935f78364dac",
+      "description": "Should not wrap around vertically to find a word",
+      "property": "search",
+      "input": {
+        "grid": [
+          "s",
+          "u",
+          "r",
+          "a",
+          "b",
+          "c",
+          "t"
+        ],
+        "wordsToSearchFor": [
+          "rust"
+        ]
+      },
+      "expected": {
+        "rust": null
+      }
     }
   ]
 }