diff --git a/UnitTesting/joil/LabWork6.cs b/UnitTesting/joil/LabWork6.cs
new file mode 100644
index 0000000..fb34c45
--- /dev/null
+++ b/UnitTesting/joil/LabWork6.cs
@@ -0,0 +1,60 @@
+using TestingLib.Math;
+
+namespace UnitTesting.joil
+{
+    public class LabWork6
+    {
+        private readonly BasicCalc _calculator;
+
+        public LabWork6()
+        {
+            _calculator = new BasicCalc();
+        }
+
+        [Fact]
+        public void Sqrt_ShouldReturnCorrectSqrt()
+        {
+            double calc = _calculator.Sqrt(144);
+            Assert.Equal(12, calc);
+        }
+
+        [Theory]
+        [InlineData(144, 12)]
+        [InlineData(0, 0)]
+        [InlineData(3, 1.732)]
+        public void Sqrt_Theory(double a, double expectedResult)
+        {
+            double calc = _calculator.Sqrt(a);
+            Assert.Equal(expectedResult, calc, 0.001);
+        }
+
+        [Fact]
+        public void Sqrt_ShouldThrowException()
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() => _calculator.Sqrt(-25));
+        }
+
+        [Fact]
+        public void IsPrime_ShouldReturnTrueIfPrime()
+        {
+            bool calc = _calculator.IsPrime(5);
+            Assert.Equal(true, calc);
+        }
+
+        [Theory]
+        [InlineData(5, true)]
+        [InlineData(6, false)]
+        [InlineData(1, false)]
+        public void IsPrime_Theory(int a, bool expectedResult)
+        {
+            bool calc = _calculator.IsPrime(a);
+            Assert.Equal(expectedResult, calc);
+        }
+
+        [Fact]
+        public void IsPrime_ShouldThrowException()
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() => _calculator.IsPrime(-2));
+        }
+    }
+}
diff --git a/UnitTesting/joil/README.md b/UnitTesting/joil/README.md
new file mode 100644
index 0000000..43cdce1
--- /dev/null
+++ b/UnitTesting/joil/README.md
@@ -0,0 +1 @@
+joil - Ëèçóíîâ Ãðèãîðèé Êîíñòàíòèíîâè÷ ÈÑÏÏ35
\ No newline at end of file