diff --git a/WorkTimeCalculator/WorkTimeCalculator.csproj b/WorkTimeCalculator/WorkTimeCalculator.csproj
index 3bfda7f..650f96d 100644
--- a/WorkTimeCalculator/WorkTimeCalculator.csproj
+++ b/WorkTimeCalculator/WorkTimeCalculator.csproj
@@ -15,7 +15,7 @@ Time complexity: O(n*k) where n is the maximum number of shifts per day, and k i
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Version>1.0.5</Version>
     <PackageTags>calculator time schedule holidays business-hours date-range shifts business-time work-time work-hours work-shifts work business hours time</PackageTags>
-    <PackageReleaseNotes>Description added to functions (enhanced)</PackageReleaseNotes>
+    <PackageReleaseNotes>ArgumentException throwing on misconfiguration</PackageReleaseNotes>
     <PackageIcon>calendar.png</PackageIcon>
     <PackageIconUrl />
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
diff --git a/WorkTimeCalculatorTest/ConfigurationTests.cs b/WorkTimeCalculatorTest/ConfigurationTests.cs
index b7ef214..5fb9a60 100644
--- a/WorkTimeCalculatorTest/ConfigurationTests.cs
+++ b/WorkTimeCalculatorTest/ConfigurationTests.cs
@@ -64,5 +64,34 @@ public void HolidayRangeReversed() {
             var ex = Assert.Throws<ArgumentException>(() => new WorkTimeCalculator(DayShifts, Holidays));
             Assert.Equal($"Holiday end preceeds the start [from {Holidays[0].Start} to {Holidays[0].End}]", ex.Message);
         }
+
+        [Fact]
+        public void ExactPeriodRange() {
+            Dictionary<DayOfWeek, List<WorkShift>> DayShifts = new Dictionary<DayOfWeek, List<WorkShift>>() {
+                { DayOfWeek.Sunday, new List<WorkShift>(){
+                    new WorkShift(){ Start = new TimeSpan(0,0,0), End = new TimeSpan(24,0,0)}
+                } }
+            };
+
+            List<HolidayConfig> Holidays = new List<HolidayConfig>();
+            var c = new WorkTimeCalculator(DayShifts, Holidays);
+
+            Assert.NotNull(c);
+        }
+
+        [Fact]
+        public void FullDaysWork() {
+            Dictionary<DayOfWeek, List<WorkShift>> DayShifts = new Dictionary<DayOfWeek, List<WorkShift>>() {
+                { DayOfWeek.Sunday, new List<WorkShift>(){
+                    new WorkShift(){ Start = new TimeSpan(0,0,0), End = new TimeSpan(24,0,0)}
+                } }
+            };
+
+            List<HolidayConfig> Holidays = new List<HolidayConfig>();
+
+            var c = new WorkTimeCalculator(DayShifts, Holidays);
+            Assert.Equal(new TimeSpan(5,0,0), c.CalculateWorkTime(new DateTime(2021,8,1,10,0,0), new DateTime(2021, 8, 1, 15, 0, 0)));
+        }
     }
+    
 }