✅ created the first working test in the project

Co-authored-by: Sindre Kjelsrud <kjelsrudsindre@gmail.com>

backend/cinemateketTests/ValidatorTests/QueryParameterValidatorsTests.cs

@@ -0,0 +1,18 @@
+using Xunit;
+using backend;
+
+
+public class QueryParameterValidatorsTests
+{
+    [Theory]
+    [InlineData("Star Wars", true)]
+    [InlineData("", false)]
+    [InlineData(null, false)]
+    public void IsValidS_ShouldReturnExpectedResult(string input, bool expectedResult)
+    {
+        bool result = QueryParameterValidators.IsValidS(input);
+        Assert.Equal(expectedResult, result);
+    }
+
+    // Add more tests for other validators
+}