added tests for new methods in BinaryPrimitivesCompat

Signed-off-by: Medha Tiwari <medhavns1@gmail.com>

Author: medhatiwari

tests/MongoDB.Bson.Tests/IO/BinaryPrimitivesCompatTests.cs

@@ -0,0 +1,52 @@
+using System;
+using Xunit;
+using MongoDB.Bson.IO;
+
+namespace MongoDB.Bson.Tests.IO
+{
+    public class BinaryPrimitivesCompatTests
+    {
+        [Theory]
+        [InlineData(0f)]
+        [InlineData(1.0f)]
+        [InlineData(-1.5f)]
+        [InlineData(float.MaxValue)]
+        [InlineData(float.MinValue)]
+        [InlineData(float.NaN)]
+        [InlineData(float.PositiveInfinity)]
+        [InlineData(float.NegativeInfinity)]
+        public void WriteAndReadSingleLittleEndian_should_roundtrip_correctly(float value)
+        {
+            Span<byte> buffer = new byte[4];
+
+            BinaryPrimitivesCompat.WriteSingleLittleEndian(buffer, value);
+            float result = BinaryPrimitivesCompat.ReadSingleLittleEndian(buffer);
+
+            if (float.IsNaN(value))
+            {
+                Assert.True(float.IsNaN(result));
+            }
+            else
+            {
+                Assert.Equal(value, result);
+            }
+        }
+
+        [Fact]
+        public void ReadSingleLittleEndian_should_throw_on_insufficient_length()
+        {
+            var shortBuffer = new byte[3];
+            Assert.Throws<ArgumentOutOfRangeException>(() =>
+                BinaryPrimitivesCompat.ReadSingleLittleEndian(shortBuffer));
+        }
+
+        [Fact]
+        public void WriteSingleLittleEndian_should_throw_on_insufficient_length()
+        {
+            var shortBuffer = new byte[3];
+            Assert.Throws<ArgumentOutOfRangeException>(() =>
+                BinaryPrimitivesCompat.WriteSingleLittleEndian(shortBuffer, 1.23f));
+        }
+    }
+}
+