diff --git a/app/src/test/java/com/annimon/hotarufx/bundles/AssertionsBundle.java b/app/src/test/java/com/annimon/hotarufx/bundles/AssertionsBundle.java
new file mode 100644
index 0000000..0124611
--- /dev/null
+++ b/app/src/test/java/com/annimon/hotarufx/bundles/AssertionsBundle.java
@@ -0,0 +1,65 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.Function;
+import com.annimon.hotarufx.lib.NumberValue;
+import com.annimon.hotarufx.lib.Validator;
+import java.util.HashMap;
+import java.util.Map;
+import lombok.val;
+import org.junit.jupiter.api.Assertions;
+import static com.annimon.hotarufx.bundles.FunctionInfo.of;
+import static com.annimon.hotarufx.bundles.FunctionType.COMMON;
+
+public class AssertionsBundle implements Bundle {
+
+    private static final Map<String, FunctionInfo> FUNCTIONS;
+    static {
+        FUNCTIONS = new HashMap<>();
+        FUNCTIONS.put("assertHasVariable", of(COMMON, AssertionsBundle::assertHasVariable));
+        FUNCTIONS.put("assertHasFunction", of(COMMON, AssertionsBundle::assertHasFunction));
+        FUNCTIONS.put("assertTrue", of(COMMON, AssertionsBundle::assertTrue));
+        FUNCTIONS.put("assertEquals", of(COMMON, AssertionsBundle::assertEquals));
+    }
+
+    @Override
+    public Map<String, FunctionInfo> functionsInfo() {
+        return FUNCTIONS;
+    }
+
+    private static Function assertHasVariable(Context context) {
+        return args -> {
+            Validator.with(args).check(1);
+            val name = args[0].asString();
+            Assertions.assertTrue(context.variables().containsKey(name));
+            return NumberValue.ZERO;
+        };
+    }
+
+    private static Function assertHasFunction(Context context) {
+        return args -> {
+            Validator.with(args).check(1);
+            val name = args[0].asString();
+            Assertions.assertTrue(context.functions().containsKey(name));
+            return NumberValue.ZERO;
+        };
+    }
+
+    private static Function assertTrue(Context context) {
+        return args -> {
+            Validator.with(args).check(1);
+            Assertions.assertTrue(args[0].asBoolean());
+            return NumberValue.ZERO;
+        };
+    }
+
+    private static Function assertEquals(Context context) {
+        return args -> {
+            Validator.with(args).check(2);
+            val expectedValue = args[0];
+            val actualValue = args[1];
+            Assertions.assertEquals(expectedValue, actualValue);
+            return NumberValue.ZERO;
+        };
+    }
+}
diff --git a/app/src/test/java/com/annimon/hotarufx/bundles/PrintBundle.java b/app/src/test/java/com/annimon/hotarufx/bundles/PrintBundle.java
new file mode 100644
index 0000000..a78d77b
--- /dev/null
+++ b/app/src/test/java/com/annimon/hotarufx/bundles/PrintBundle.java
@@ -0,0 +1,65 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.Function;
+import com.annimon.hotarufx.lib.NumberValue;
+import java.util.HashMap;
+import java.util.Map;
+import lombok.val;
+import static com.annimon.hotarufx.bundles.FunctionInfo.of;
+import static com.annimon.hotarufx.bundles.FunctionType.COMMON;
+
+public class PrintBundle implements Bundle {
+
+    private static final Map<String, FunctionInfo> FUNCTIONS;
+    static {
+        FUNCTIONS = new HashMap<>();
+        FUNCTIONS.put("print", of(COMMON, PrintBundle::print));
+        FUNCTIONS.put("println", of(COMMON, PrintBundle::println));
+        FUNCTIONS.put("dump", of(COMMON, PrintBundle::dump));
+    }
+
+    @Override
+    public Map<String, FunctionInfo> functionsInfo() {
+        return FUNCTIONS;
+    }
+
+    private static Function print(Context context) {
+        return args -> {
+            if (args.length > 0) {
+                System.out.print(args[0]);
+            }
+            return NumberValue.ZERO;
+        };
+    }
+
+    private static Function println(Context context) {
+        return args -> {
+            if (args.length > 0) {
+                System.out.println(args[0]);
+            } else {
+                System.out.println();
+            }
+            return NumberValue.ZERO;
+        };
+    }
+
+    private static Function dump(Context context) {
+        return args -> {
+            val maxVariableLength = context.variables()
+                    .keySet().stream()
+                    .mapToInt(String::length)
+                    .max()
+                    .orElse(20);
+            System.out.println("\n\tVARIABLES");
+            val format = "%"+maxVariableLength+"s   %s%n";
+            context.variables().forEach((k, v) -> {
+                System.out.printf(format, k, v);
+            });
+
+            System.out.println("\n\tFUNCTIONS");
+            context.functions().keySet().forEach(System.out::println);
+            return NumberValue.ZERO;
+        };
+    }
+}
diff --git a/app/src/test/java/com/annimon/hotarufx/bundles/ProgramTest.java b/app/src/test/java/com/annimon/hotarufx/bundles/ProgramTest.java
new file mode 100644
index 0000000..726e023
--- /dev/null
+++ b/app/src/test/java/com/annimon/hotarufx/bundles/ProgramTest.java
@@ -0,0 +1,56 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.io.IOStream;
+import com.annimon.hotarufx.lexer.HotaruLexer;
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.Value;
+import com.annimon.hotarufx.parser.HotaruParser;
+import com.annimon.hotarufx.parser.visitors.InterpreterVisitor;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.ArrayList;
+import java.util.stream.Stream;
+import lombok.val;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class ProgramTest {
+
+    private static final String RES_DIR = "src/test/resources";
+
+    static Stream<Arguments> programPathProvider() throws IOException {
+        return Files.list(Paths.get(RES_DIR))
+                .filter(p -> p.toString().endsWith(".hfx"))
+                .map(Arguments::of);
+    }
+
+    static Value run(Path path, Context context) {
+        final String input;
+        try (InputStream is = Files.newInputStream(path, StandardOpenOption.READ)) {
+            input = IOStream.readContent(is);
+        } catch (IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+        return HotaruParser.parse(HotaruLexer.tokenize(input))
+                .accept(new InterpreterVisitor(), context);
+    }
+
+    @DisplayName("Test programs")
+    @MethodSource("programPathProvider")
+    @ParameterizedTest
+    void testProgram(Path path) {
+        val context = new Context();
+        val bundles = new ArrayList<Class<? extends Bundle>>();
+        bundles.addAll(BundleLoader.runtimeBundles());
+        bundles.add(AssertionsBundle.class);
+        bundles.add(PrintBundle.class);
+        BundleLoader.load(context, bundles);
+        run(path, context);
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/resources/test.hfx b/app/src/test/resources/test.hfx
new file mode 100644
index 0000000..b8740fd
--- /dev/null
+++ b/app/src/test/resources/test.hfx
@@ -0,0 +1,24 @@
+composition(1280, 720, 30)
+
+A = circle({
+  radius: 100,
+  fill: '#9bc747'
+})
+
+assertEquals(A.cx, A.cy)
+assertEquals(0, A.cy)
+assertEquals(100, A.radius)
+A@radius
+  .add(300 ms, 200)
+  .add(1 sec, 50)
+
+assertHasVariable("A")
+assertHasVariable("Width")
+assertHasVariable("HalfWidth")
+
+println(Width)
+println(HalfWidth)
+
+dump()
+
+render(A)