diff --git a/liquidjava-verifier/pom.xml b/liquidjava-verifier/pom.xml
index 5b42f4cb..d3aeacf0 100644
--- a/liquidjava-verifier/pom.xml
+++ b/liquidjava-verifier/pom.xml
@@ -38,6 +38,46 @@
 					<compilerTargetPlatform>20</compilerTargetPlatform>
 				</configuration>
 			</plugin>
+
+				<plugin>
+				<groupId>org.jacoco</groupId>
+			<artifactId>jacoco-maven-plugin</artifactId>
+		<version>0.8.14</version>
+	<executions>
+	<execution>
+	<id>default-prepare-agent</id>
+<goals>
+	<goal>prepare-agent</goal>
+</goals>
+</execution>
+<execution>
+	<id>default-report</id>
+<goals>
+	<goal>report</goal>
+</goals>
+</execution>
+<execution>
+	<id>default-check</id>
+<goals>
+	<goal>check</goal>
+</goals>
+<configuration>
+	<rules>
+	<rule>
+	<element>BUNDLE</element>
+<limits>
+	<limit>
+	<counter>COMPLEXITY</counter>
+<value>COVEREDRATIO</value>
+<minimum>0.4</minimum>
+</limit>
+</limits>
+</rule>
+</rules>
+</configuration>
+</execution>
+</executions>
+</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/CommandLineLauncherIntegrationTest.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/CommandLineLauncherIntegrationTest.java
new file mode 100644
index 00000000..ba435644
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/CommandLineLauncherIntegrationTest.java
@@ -0,0 +1,73 @@
+package liquidjava.verifier.integration;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.*;
+import java.nio.file.*;
+import java.util.*;
+
+import org.junit.jupiter.api.*;
+
+public class CommandLineLauncherIntegrationTest {
+
+    private static final String VERIFIER_MAIN = "liquidjava.api.CommandLineLauncher";
+
+    @BeforeAll
+    static void setup() {
+        // se necessário: compilar os exemplos ou garantir que os ficheiros de teste existem
+    }
+
+    @Test
+    void testCorrectExampleShouldPassVerification() throws Exception {
+        // supondo que existe no projecto um ficheiro de exemplo “CorrectSimpleAssignment.java”
+        Path example = Paths.get("liquidjava-example/src/main/java/testSuite/CorrectSimpleAssignment.java");
+        assertTrue(Files.exists(example), "Ficheiro de exemplo correcto não encontrado: " + example);
+
+        ProcessBuilder pb = new ProcessBuilder(
+            "java",
+            "-cp",
+            System.getProperty("java.class.path"),
+            VERIFIER_MAIN,
+            example.toString()
+        );
+        pb.redirectErrorStream(true);
+        Process process = pb.start();
+
+        String output;
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+            output = reader.lines().reduce("", (a,b) -> a + b + System.lineSeparator());
+        }
+        int exitCode = process.waitFor();
+        // verificar que passou
+        assertEquals(0, exitCode, "Exit code devia ser 0 para caso correcto. Output:\n" + output);
+        assertTrue(output.contains("Correct! Passed Verification") || output.contains("Passed Verification"),
+                   "Output inesperado para caso correcto: " + output);
+    }
+
+    @Test
+    void testErrorExampleShouldFailVerification() throws Exception {
+        // supondo que existe o ficheiro “ErrorSimpleAssignment.java”
+        Path example = Paths.get("liquidjava-example/src/main/java/testSuite/ErrorSimpleAssignment.java");
+        assertTrue(Files.exists(example), "Ficheiro de exemplo de erro não encontrado: " + example);
+
+        ProcessBuilder pb = new ProcessBuilder(
+            "java",
+            "-cp",
+            System.getProperty("java.class.path"),
+            VERIFIER_MAIN,
+            example.toString()
+        );
+        pb.redirectErrorStream(true);
+        Process process = pb.start();
+
+        String output;
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+            output = reader.lines().reduce("", (a,b) -> a + b + System.lineSeparator());
+        }
+        int exitCode = process.waitFor();
+        // verificar que falhou
+        assertNotEquals(0, exitCode, "Exit code devia ser diferente de 0 para caso de erro. Output:\n" + output);
+        assertTrue(output.toLowerCase().contains("error") || output.contains("Refinement violation"),
+                   "Output inesperado para caso de erro: " + output);
+    }
+}
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestIntegration.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestIntegration.java
new file mode 100644
index 00000000..9bcf7956
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestIntegration.java
@@ -0,0 +1,19 @@
+package liquidjava.integration;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import liquidjava.rj_language.ast.BinaryExpression;
+import liquidjava.rj_language.ast.LiteralInt;
+import liquidjava.rj_language.opt.ConstantFolding;
+import liquidjava.rj_language.opt.derivation_node.ValDerivationNode;
+
+public class TestIntegration {
+    @Test
+    public void testConstantFoldingIntegration() {
+        BinaryExpression expr = new BinaryExpression(new LiteralInt(3), "*", new LiteralInt(4));
+        ValDerivationNode result = ConstantFolding.fold(new ValDerivationNode(expr, null));
+        assertEquals(new LiteralInt(12), result.getValue());
+    }
+}
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestLiteralString.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestLiteralString.java
new file mode 100644
index 00000000..7e82772f
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/TestLiteralString.java
@@ -0,0 +1,14 @@
+package liquidjava.rj_language;
+
+import static org.junit.Assert.assertNotEquals;
+import org.junit.Test;
+import liquidjava.rj_language.ast.LiteralString;
+
+public class TestLiteralString {
+    @Test
+    public void testLiteralString() {
+        LiteralString s1 = new LiteralString("hello");
+        LiteralString s2 = new LiteralString("world");
+        assertNotEquals(s1.hashCode(), s2.hashCode());
+    }
+}
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/opt/TestOptimization.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/opt/TestOptimization.java
new file mode 100644
index 00000000..cdf819a8
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/opt/TestOptimization.java
@@ -0,0 +1,18 @@
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import liquidjava.rj_language.ast.BinaryExpression;
+import liquidjava.rj_language.ast.LiteralInt;
+import liquidjava.rj_language.opt.ConstantFolding;
+import liquidjava.rj_language.opt.derivation_node.ValDerivationNode;
+
+public class TestOptimization {
+    @Test
+    public void testBinaryFold() {
+        BinaryExpression b = new BinaryExpression(new LiteralInt(1), "+", new LiteralInt(2));
+
+        ValDerivationNode r = ConstantFolding.fold(new ValDerivationNode(b, null));
+        assertEquals(r.getValue(), new LiteralInt(3));
+    }
+}