add Where_string_contains

Author: SimonCropp

src/Tests/IntegrationTests/IntegrationTests.Where_string_contains.verified.txt

@@ -0,0 +1,33 @@
+{
+  target:
+{
+  "data": {
+    "stringEntities": [
+      {
+        "id": "Guid_1",
+        "property": "b"
+      },
+      {
+        "id": "Guid_2",
+        "property": "ab"
+      },
+      {
+        "id": "Guid_3",
+        "property": "bc"
+      },
+      {
+        "id": "Guid_4",
+        "property": "abc"
+      }
+    ]
+  }
+},
+  sql: {
+    Text:
+select s.Id,
+       s.Property
+from   StringEntities as s
+where  s.Property is not null
+       and cast (CHARINDEX(N'b', s.Property) as int) - 1 <> -1
+  }
+}

src/Tests/IntegrationTests/IntegrationTests.Where_string_notEqual.verified.txt

@@ -4,10 +4,12 @@
   "data": {
     "stringEntities": [
       {
-        "id": "Guid_1"
+        "id": "Guid_1",
+        "property": "Value"
       },
       {
-        "id": "Guid_2"
+        "id": "Guid_2",
+        "property": null
       }
     ]
   }

src/Tests/IntegrationTests/IntegrationTests.cs

@@ -223,7 +223,7 @@ public async Task Where_string_notEqual()
             {
               stringEntities (where: {path: "Property", comparison: notEqual, value: "notValue"})
               {
-                id
+                id, property
               }
             }
             """;
@@ -242,6 +242,53 @@ public async Task Where_string_notEqual()
         await RunQuery(database, query, null, null, false, [entity1, entity2, entity3]);
     }
 
+    [Fact]
+    public async Task Where_string_contains()
+    {
+        var query =
+            """
+            {
+              stringEntities (where: {path: "Property", comparison: contains, value: "b" })
+              {
+                id, property
+              }
+            }
+            """;
+
+        var entity1 = new StringEntity();
+        var entity2 = new StringEntity
+        {
+            Property = "a"
+        };
+        var entity3 = new StringEntity
+        {
+            Property = "ab"
+        };
+        var entity4 = new StringEntity
+        {
+            Property = "abc"
+        };
+        var entity5 = new StringEntity
+        {
+            Property = "bc"
+        };
+        var entity6 = new StringEntity
+        {
+            Property = "c"
+        };
+        var entity7 = new StringEntity
+        {
+            Property = "b"
+        };
+        var entity8 = new StringEntity
+        {
+            Property = ""
+        };
+
+        await using var database = await sqlInstance.Build();
+        await RunQuery(database, query, null, null, false, [entity1, entity2, entity3, entity4, entity5, entity6, entity7, entity8]);
+    }
+
     [Fact]
     public async Task Where_enum_in()
     {