allow TotalRecords to be 0

Author: jaredcnance

src/JsonApiDotNetCore/Internal/PageManager.cs

@@ -11,7 +11,7 @@ public class PageManager
         public int DefaultPageSize { get; set; }
         public int CurrentPage { get; set; }
         public bool IsPaginated => PageSize > 0;
-        public int TotalPages => (TotalRecords == 0 || TotalRecords == null) ? -1 : (int)Math.Ceiling(decimal.Divide(TotalRecords.Value, PageSize));
+        public int TotalPages => (TotalRecords == null) ? -1 : (int)Math.Ceiling(decimal.Divide(TotalRecords.Value, PageSize));
 
         public RootLinks GetPageLinks(LinkBuilder linkBuilder)
         {

test/JsonApiDotNetCoreExampleTests/Acceptance/Spec/DocumentTests/Meta.cs

@@ -88,7 +88,6 @@ public async Task Total_Record_Count_Not_Included_In_POST_Response()
             // arrange
             _context.TodoItems.RemoveRange(_context.TodoItems);
             _context.SaveChanges();
-            var expectedCount = 1;
             var builder = new WebHostBuilder()
                 .UseStartup<MetaStartup>();
 
@@ -120,7 +119,7 @@ public async Task Total_Record_Count_Not_Included_In_POST_Response()
 
             // assert
             Assert.Equal(HttpStatusCode.Created, response.StatusCode);
-            Assert.Null(documents.Meta);
+            Assert.False(documents.Meta.ContainsKey("total-records"));
         }
 
         [Fact]
@@ -131,7 +130,6 @@ public async Task Total_Record_Count_Not_Included_In_PATCH_Response()
             TodoItem todoItem = new TodoItem();
             _context.TodoItems.Add(todoItem);
             _context.SaveChanges();
-            var expectedCount = 1;
             var builder = new WebHostBuilder()
                 .UseStartup<MetaStartup>();
 
@@ -164,7 +162,7 @@ public async Task Total_Record_Count_Not_Included_In_PATCH_Response()
 
             // assert
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
-            Assert.Null(documents.Meta);
+            Assert.False(documents.Meta.ContainsKey("total-records"));
         }
 
         [Fact]