Add tests

Author: vanifatovvlad

Tests/ParserTests.cs

@@ -43,11 +43,13 @@ public class ParserTests
         [TestCase("NOT(5)", ExpectedResult = 0)]
         [TestCase("NOT(NOT(0))", ExpectedResult = 0)]
         // MIN
+        [TestCase("MIN(5)", ExpectedResult = 5)]
         [TestCase("MIN(0, 0)", ExpectedResult = 0)]
         [TestCase("MIN(0, 1)", ExpectedResult = 0)]
         [TestCase("MIN(-5, 5)", ExpectedResult = -5)]
         [TestCase("MIN(5, 4, 7, 3, 4)", ExpectedResult = 3)]
         // MAX
+        [TestCase("MAX(5)", ExpectedResult = 5)]
         [TestCase("MAX(0, 0)", ExpectedResult = 0)]
         [TestCase("MAX(0, 1)", ExpectedResult = 1)]
         [TestCase("MAX(-5, 5)", ExpectedResult = 5)]