Pattern combinators

Src/FluentAssertions/Common/FullFrameworkReflector.cs

@@ -30,8 +30,7 @@ private static bool IsRelevant(Assembly ass)
 
     private static bool IsDynamic(Assembly assembly)
     {
-        return (assembly.GetType().FullName == "System.Reflection.Emit.AssemblyBuilder") ||
-               (assembly.GetType().FullName == "System.Reflection.Emit.InternalAssemblyBuilder");
+        return assembly.GetType().FullName is "System.Reflection.Emit.AssemblyBuilder" or "System.Reflection.Emit.InternalAssemblyBuilder";
     }
 
     private static IEnumerable<Type> GetExportedTypes(Assembly assembly)

Src/FluentAssertions/Equivalency/Steps/ValueTypeEquivalencyStep.cs

@@ -12,7 +12,7 @@ public EquivalencyResult Handle(Comparands comparands, IEquivalencyValidationCon
         Type expectationType = comparands.GetExpectedType(context.Options);
         EqualityStrategy strategy = context.Options.GetEqualityStrategy(expectationType);
 
-        bool canHandle = (strategy == EqualityStrategy.Equals) || (strategy == EqualityStrategy.ForceEquals);
+        bool canHandle = strategy is EqualityStrategy.Equals or EqualityStrategy.ForceEquals;
         if (canHandle)
         {
             context.Tracer.WriteLine(member =>

Src/FluentAssertions/Extensions/FluentDateTimeExtensions.cs

@@ -144,12 +144,12 @@ public static DateTime At(this DateTime date, TimeSpan time)
     /// </summary>
     public static DateTime At(this DateTime date, int hours, int minutes, int seconds = 0, int milliseconds = 0, int microseconds = 0, int nanoseconds = 0)
     {
-        if (microseconds < 0 || microseconds > 999)
+        if (microseconds is < 0 or > 999)
         {
             throw new ArgumentOutOfRangeException(nameof(microseconds), "Valid values are between 0 and 999");
         }
 
-        if (nanoseconds < 0 || nanoseconds > 999)
+        if (nanoseconds is < 0 or > 999)
         {
             throw new ArgumentOutOfRangeException(nameof(nanoseconds), "Valid values are between 0 and 999");
         }
@@ -175,12 +175,12 @@ public static DateTime At(this DateTime date, int hours, int minutes, int second
     /// </summary>
     public static DateTimeOffset At(this DateTimeOffset date, int hours, int minutes, int seconds = 0, int milliseconds = 0, int microseconds = 0, int nanoseconds = 0)
     {
-        if (microseconds < 0 || microseconds > 999)
+        if (microseconds is < 0 or > 999)
         {
             throw new ArgumentOutOfRangeException(nameof(microseconds), "Valid values are between 0 and 999");
         }
 
-        if (nanoseconds < 0 || nanoseconds > 999)
+        if (nanoseconds is < 0 or > 999)
         {
             throw new ArgumentOutOfRangeException(nameof(nanoseconds), "Valid values are between 0 and 999");
         }
@@ -257,11 +257,6 @@ public static int Nanosecond(this DateTimeOffset self)
     /// </summary>
     public static DateTime AddNanoseconds(this DateTime self, long nanoseconds)
     {
-        if (nanoseconds == 0)
-        {
-            return self;
-        }
-
         return self + nanoseconds.Nanoseconds();
     }
 
@@ -270,11 +265,6 @@ public static DateTime AddNanoseconds(this DateTime self, long nanoseconds)
     /// </summary>
     public static DateTimeOffset AddNanoseconds(this DateTimeOffset self, long nanoseconds)
     {
-        if (nanoseconds == 0)
-        {
-            return self;
-        }
-
         return self + nanoseconds.Nanoseconds();
     }
 
@@ -299,11 +289,6 @@ public static int Microsecond(this DateTimeOffset self)
     /// </summary>
     public static DateTime AddMicroseconds(this DateTime self, long microseconds)
     {
-        if (microseconds == 0)
-        {
-            return self;
-        }
-
         return self + microseconds.Microseconds();
     }
 
@@ -312,11 +297,6 @@ public static DateTime AddMicroseconds(this DateTime self, long microseconds)
     /// </summary>
     public static DateTimeOffset AddMicroseconds(this DateTimeOffset self, long microseconds)
     {
-        if (microseconds == 0)
-        {
-            return self;
-        }
-
         return self + microseconds.Microseconds();
     }
 

Src/FluentAssertions/Formatting/DateTimeOffsetValueFormatter.cs

@@ -15,7 +15,7 @@ public class DateTimeOffsetValueFormatter : IValueFormatter
     /// </returns>
     public bool CanHandle(object value)
     {
-        return (value is DateTime) || (value is DateTimeOffset);
+        return value is DateTime or DateTimeOffset;
     }
 
     public void Format(object value, FormattedObjectGraph formattedGraph, FormattingContext context, FormatChild formatChild)

Tests/FluentAssertions.Specs/Common/TimeSpanExtensions.cs

@@ -17,7 +17,7 @@ public static TimeSpan Multiply(this TimeSpan timeSpan, double factor)
         // Rounding to the nearest tick is as close to the result we would have with unlimited
         // precision as possible, and so likely to have the least potential to surprise.
         double ticks = Math.Round(timeSpan.Ticks * factor);
-        if (ticks > long.MaxValue || ticks < long.MinValue)
+        if (ticks is > long.MaxValue or < long.MinValue)
         {
             throw new OverflowException("TimeSpan overflowed because the duration is too long.");
         }