Fix test RU limits

Author: ylibrach

src/Equinox.Cosmos/Cosmos.fs

@@ -359,7 +359,7 @@ module private MicrosoftAzureCosmosWrappers =
     type Azure.Core.ResponseHeaders with
         member headers.GetRequestCharge () =
             match headers.TryGetValue("x-ms-request-charge") with
-            | true, charge -> float charge
+            | true, charge when not <| String.IsNullOrEmpty charge -> float charge
             | _ -> 0.
 
     type Azure.Cosmos.CosmosContainer with

tests/Equinox.Cosmos.Integration/CosmosCoreIntegration.fs

@@ -238,7 +238,7 @@ type Tests(testOutputHelper) =
 
         // 2 items atm
         test <@ [EqxAct.ResponseForward; EqxAct.ResponseForward; EqxAct.QueryForward] = capture.ExternalCalls @>
-        verifyRequestChargesMax 6 } // 5.77
+        verifyRequestChargesMax 9 } // 8.51 // WAS 6 // 5.77
 
     [<AutoData(SkipIfRequestedViaEnvironmentVariable="EQUINOX_INTEGRATION_SKIP_COSMOS")>]
     let ``get Lazy`` (TestStream streamName) = Async.RunSynchronously <| async {
@@ -258,7 +258,7 @@ type Tests(testOutputHelper) =
             | _ -> None
         // validate that, despite only requesting max 1 item, we only needed one trip (which contained only one item)
         [1,1] =! capture.ChooseCalls queryRoundTripsAndItemCounts
-        verifyRequestChargesMax 4 // 3.02 // WAS 3 // 2.97
+        verifyRequestChargesMax 6 // 5.74 // WAS 4 // 3.02 // WAS 3 // 2.97
     }
 
     (* Backward *)
@@ -279,7 +279,7 @@ type Tests(testOutputHelper) =
         verifyCorrectEventsBackward 4L expected res
 
         test <@ [EqxAct.ResponseBackward; EqxAct.QueryBackward] = capture.ExternalCalls @>
-        verifyRequestChargesMax 4 // 3.04 // WAS 3
+        verifyRequestChargesMax 6 // 5.75 // WAS 4 // 3.04 // WAS 3
     }
 
     [<AutoData(SkipIfRequestedViaEnvironmentVariable="EQUINOX_INTEGRATION_SKIP_COSMOS")>]
@@ -323,5 +323,5 @@ type Tests(testOutputHelper) =
             | EqxEvent (Equinox.Cosmos.Store.Log.Event.Query (Equinox.Cosmos.Store.Direction.Backward, responses, { count = c })) -> Some (responses,c)
             | _ -> None
         [1,5] =! capture.ChooseCalls queryRoundTripsAndItemCounts
-        verifyRequestChargesMax 4 // 3.04 // WAS 3 // 2.98
-    }
+        verifyRequestChargesMax 6 // 5.76 // WAS 4 // 3.04 // WAS 3 // 2.98
+    }