From 5521d5857b122699120fbd749776dea44ffaa35b Mon Sep 17 00:00:00 2001
From: Dimitar Trendafilov <trendafilov.dn@gmail.com>
Date: Mon, 2 Nov 2020 09:06:17 +0200
Subject: Add tests for the AST Interpreter

---
 JSImpl/test/ASTInterpreterTests.cpp | 58 +++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 JSImpl/test/ASTInterpreterTests.cpp

(limited to 'JSImpl/test/ASTInterpreterTests.cpp')

diff --git a/JSImpl/test/ASTInterpreterTests.cpp b/JSImpl/test/ASTInterpreterTests.cpp
new file mode 100644
index 0000000..389f53c
--- /dev/null
+++ b/JSImpl/test/ASTInterpreterTests.cpp
@@ -0,0 +1,58 @@
+#include <gtest/gtest.h>
+
+#include <src/CommonTypes.h>
+#include <src/Lexer.h>
+#include <src/Parser.h>
+#include <src/ASTPrinter.h>
+#include <src/ASTInterpreter.h>
+
+struct ASTInterpret : ::testing::Test
+{
+	void Run(const char* program)
+	{
+		auto tokens = Tokenize(program).tokens;
+		auto expr = Parse(tokens);
+		Interpreter.Run(expr.get());
+	}
+
+	bool HasVariable(const char* name)
+	{
+		return Interpreter.HasVariable(name);
+	}
+
+	double ValueAsNumber(const char* name)
+	{
+		return std::get<double>(*Interpreter.ModifyVariable(name));
+	}
+
+	IPLString ValueAsString(const char* name)
+	{
+		return std::get<IPLString>(*Interpreter.ModifyVariable(name));
+	}
+
+	ASTInterpreter Interpreter;
+};
+
+TEST_F(ASTInterpret, VarNumber)
+{
+	Run("var answer = 6 * 7");
+	ASSERT_TRUE(HasVariable("answer"));
+	ASSERT_DOUBLE_EQ(ValueAsNumber("answer"), 42.0);
+}
+
+TEST_F(ASTInterpret, VarString)
+{
+	Run("var name = 'John' + ' ' + 'Doe'");
+	ASSERT_TRUE(HasVariable("name"));
+	ASSERT_EQ(ValueAsString("name"), "John Doe");
+}
+
+TEST_F(ASTInterpret, StringPlusNumberNotSupported)
+{
+	ASSERT_THROW(Run("var data = 'John Doe' + 42"), std::runtime_error);
+}
+
+TEST_F(ASTInterpret, StringMinusString)
+{
+	ASSERT_THROW(Run("var data = 'John' - 'Doe'"), std::runtime_error);
+}
-- 
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