diff --git a/liquidjava-verifier/pom.xml b/liquidjava-verifier/pom.xml
index 5b42f4cb..19d3eb24 100644
--- a/liquidjava-verifier/pom.xml
+++ b/liquidjava-verifier/pom.xml
@@ -19,6 +19,45 @@
 	<build>
 		<finalName>${jar.finalName}</finalName>
 		<plugins>
+			<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>0.60</minimum>
+										</limit>
+									</limits>
+								</rule>
+							</rules>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 			<plugin>
 				<groupId>net.revelc.code.formatter</groupId>
 				<artifactId>formatter-maven-plugin</artifactId>
diff --git a/liquidjava-verifier/src/test/java/liquidjava/api/tests/ErrorEmitterBasicTest.java b/liquidjava-verifier/src/test/java/liquidjava/api/tests/ErrorEmitterBasicTest.java
new file mode 100644
index 00000000..5d8f765f
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/api/tests/ErrorEmitterBasicTest.java
@@ -0,0 +1,17 @@
+package liquidjava.api.tests;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import liquidjava.errors.ErrorEmitter;
+
+public class ErrorEmitterBasicTest {
+
+    @Test
+    public void estadoInicialSemErro() {
+        ErrorEmitter er = new ErrorEmitter();
+        assertFalse(er.foundError());
+        assertEquals(0, er.getErrorStatus());
+    }
+}
\ No newline at end of file
diff --git a/liquidjava-verifier/src/test/java/liquidjava/ast/opt/TestOptimization.java b/liquidjava-verifier/src/test/java/liquidjava/ast/opt/TestOptimization.java
new file mode 100644
index 00000000..d9628ccb
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/ast/opt/TestOptimization.java
@@ -0,0 +1,20 @@
+package liquidjava.ast.opt;
+
+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));
+    }
+}
\ No newline at end of file
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..bb198e05
--- /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());
+    }
+}
\ No newline at end of file
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitBoolean.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitBoolean.java
new file mode 100644
index 00000000..c5d74ae4
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitBoolean.java
@@ -0,0 +1,31 @@
+package liquidjava.rj_language.ast;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+public class TestHashLitBoolean {
+
+    @Test
+    void sameValue_sameHashCode_andEquals() {
+        LiteralBoolean a = new LiteralBoolean(true);
+        LiteralBoolean b = new LiteralBoolean(true);
+        assertEquals(a, b);
+        assertEquals(a.hashCode(), b.hashCode());
+    }
+
+    @Test
+    void differentValues_differentHashCodes() {
+        LiteralBoolean a = new LiteralBoolean(true);
+        LiteralBoolean b = new LiteralBoolean(false);
+        assertNotEquals(a, b);
+        assertNotEquals(a.hashCode(), b.hashCode());
+    }
+
+    @Test
+    void clone_preservesEqualityAndHashCode() {
+        LiteralBoolean a = new LiteralBoolean(false);
+        LiteralBoolean c = (LiteralBoolean) a.clone();
+        assertEquals(a, c);
+        assertEquals(a.hashCode(), c.hashCode());
+    }
+}
diff --git a/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitReal.java b/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitReal.java
new file mode 100644
index 00000000..8a8e2cc1
--- /dev/null
+++ b/liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestHashLitReal.java
@@ -0,0 +1,32 @@
+package liquidjava.rj_language.ast;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class TestHashLitReal {
+
+    @Test
+    public void sameValue_sameHashCode_andEquals() {
+        LiteralReal a = new LiteralReal(3.14);
+        LiteralReal b = new LiteralReal(3.14);
+        assertEquals(a, b);
+        assertEquals(a.hashCode(), b.hashCode());
+    }
+
+    @Test
+    public void differentValues_differentHashCodes() {
+        LiteralReal a = new LiteralReal(1.0);
+        LiteralReal b = new LiteralReal(2.0);
+        assertNotEquals(a, b);
+        assertNotEquals(a.hashCode(), b.hashCode());
+    }
+
+    @Test
+    public void clone_preservesEqualityAndHashCode() {
+        LiteralReal a = new LiteralReal(-42.5);
+        LiteralReal c = (LiteralReal) a.clone();
+        assertEquals(a, c);
+        assertEquals(a.hashCode(), c.hashCode());
+    }
+}