add: Variable declaration tests.

CanonSharp.Tests/ParserTests/VariableDeclarationTests.cs

@@ -0,0 +1,20 @@
+using CanonSharp.Pascal.Parser;
+using CanonSharp.Pascal.SyntaxTree;
+using CanonSharp.Tests.Utils;
+
+namespace CanonSharp.Tests.ParserTests;
+
+public class VariableDeclarationTests : GrammarParserTestBase
+{
+    [Theory]
+    [InlineData("boolean", "boolean")]
+    [InlineData("integer", "integer")]
+    [InlineData("char", "char")]
+    [InlineData("real", "real")]
+    public void TypeParseTest(string input, string value)
+    {
+        TypeNode node = RunParser<TypeNode>(GrammarParser.TypeParser(), input);
+        Assert.Equal(value, node.TypeToken.LiteralValue);
+    }
+}
+