Added tests for new JSON tokens.

test/Pasper.Json.Tests/Tokens/CommentTests.cs

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+using Pasper.Json.Tokens;
+
+namespace Pasper.Json.Tests.Tokens;
+
+public class CommentTests
+{
+    [Fact]
+    public void Value_ShouldBeSlashSlash()
+    {
+        const string expected = "abc";
+        var token = new Comment(expected);
+        Assert.Equal(expected, token.Value);
+    }
+}

test/Pasper.Json.Tests/Tokens/FalseLiteralTests.cs

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+using Pasper.Json.Tokens;
+
+namespace Pasper.Json.Tests.Tokens;
+
+public class FalseLiteralTests
+{
+    [Fact]
+    public void Value_ShouldBeFalse()
+    {
+        const string expected = "false";
+        var token = new FalseLiteral();
+        Assert.Equal(expected, token.Value);
+    }
+}

test/Pasper.Json.Tests/Tokens/NullLiteralTests.cs

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+using Pasper.Json.Tokens;
+
+namespace Pasper.Json.Tests.Tokens;
+
+public class NullLiteralTests
+{
+    [Fact]
+    public void Value_ShouldBeNull()
+    {
+        const string expected = "null";
+        var token = new NullLiteral();
+        Assert.Equal(expected, token.Value);
+    }
+}

test/Pasper.Json.Tests/Tokens/NumberLiteralTests.cs

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+using Pasper.Json.Tokens;
+
+namespace Pasper.Json.Tests.Tokens;
+
+public class NumberLiteralTests
+{
+    [Fact]
+    public void Value_ShouldBeNumber()
+    {
+        const string expected = "123";
+        var token = new NumberLiteral("123");
+        Assert.Equal(expected, token.Value);
+    }
+}

test/Pasper.Json.Tests/Tokens/TrueLiteralTests.cs

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+using Pasper.Json.Tokens;
+
+namespace Pasper.Json.Tests.Tokens;
+
+public class TrueLiteralTests
+{
+    [Fact]
+    public void Value_ShouldBeTrue()
+    {
+        const string expected = "true";
+        var token = new TrueLiteral();
+        Assert.Equal(expected, token.Value);
+    }
+}