diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1f58140..6b6a807 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,3 +2,7 @@ build:
   script:
     - mvn -Dmaven.repo.local=/tmp/m2/repository -Duser.home=/tmp checkstyle:check
     - mvn -Dmaven.repo.local=/tmp/m2/repository -Duser.home=/tmp test
+    - mvn -Dmaven.repo.local=/tmp/m2/repository -Duser.home=/tmp cobertura:cobertura
+  artifacts:
+    reports:
+      cobertura: target/site/cobertura/coverage.xml
diff --git a/pom.xml b/pom.xml
index 30663be..fc13d67 100644
--- a/pom.xml
+++ b/pom.xml
@@ -154,6 +154,17 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>2.22.2</version>
             </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>cobertura-maven-plugin</artifactId>
+                <version>2.7</version>
+                <configuration>
+                    <check/>
+                    <formats>
+                        <format>xml</format>
+                    </formats>
+                </configuration>
+            </plugin>
 
             <plugin>
                 <artifactId>maven-checkstyle-plugin</artifactId>
@@ -255,4 +266,20 @@
         </profile>
 
     </profiles>
+
+    <reporting>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>cobertura-maven-plugin</artifactId>
+                <version>2.7</version>
+                <configuration>
+                    <check/>
+                    <formats>
+                        <format>xml</format>
+                    </formats>
+                </configuration>
+            </plugin>
+        </plugins>
+    </reporting>
 </project>
\ No newline at end of file
diff --git a/src/main/java/edu/kit/typicalc/model/parser/ParseError.java b/src/main/java/edu/kit/typicalc/model/parser/ParseError.java
index 4bb340b..4b11451 100644
--- a/src/main/java/edu/kit/typicalc/model/parser/ParseError.java
+++ b/src/main/java/edu/kit/typicalc/model/parser/ParseError.java
@@ -6,11 +6,14 @@ public enum ParseError {
      *  the lambda term didn't meet the specified syntax
      */
     UNEXPECTED_TOKEN,
-    
+
+    /**
+     * some tokens were remaining after parsing a full lambda term
+     */
     TOO_MANY_TOKENS,
 
     /**
-     * the String contained a character not allowed in that place
+     * the string contained a character not allowed in that context
      */
     UNEXPECTED_CHARACTER
 }
diff --git a/src/main/java/edu/kit/typicalc/model/term/BooleanTerm.java b/src/main/java/edu/kit/typicalc/model/term/BooleanTerm.java
index a4c2f52..06626f7 100644
--- a/src/main/java/edu/kit/typicalc/model/term/BooleanTerm.java
+++ b/src/main/java/edu/kit/typicalc/model/term/BooleanTerm.java
@@ -2,6 +2,8 @@ package edu.kit.typicalc.model.term;
 
 import edu.kit.typicalc.model.type.NamedType;
 
+import java.util.Objects;
+
 /**
  * Representation of a constant boolean lambda term: either false or true.
  */
@@ -30,4 +32,21 @@ public class BooleanTerm extends ConstTerm {
 	public String toString() {
 		return Boolean.toString(value);
 	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		BooleanTerm that = (BooleanTerm) o;
+		return value == that.value;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(value);
+	}
 }
diff --git a/src/test/java/edu/kit/typicalc/model/parser/LambdaParserTest.java b/src/test/java/edu/kit/typicalc/model/parser/LambdaParserTest.java
index eecba8c..ec5409d 100644
--- a/src/test/java/edu/kit/typicalc/model/parser/LambdaParserTest.java
+++ b/src/test/java/edu/kit/typicalc/model/parser/LambdaParserTest.java
@@ -4,6 +4,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import edu.kit.typicalc.model.term.AbsTerm;
 import edu.kit.typicalc.model.term.AppTerm;
+import edu.kit.typicalc.model.term.BooleanTerm;
 import edu.kit.typicalc.model.term.ConstTerm;
 import edu.kit.typicalc.model.term.IntegerTerm;
 import edu.kit.typicalc.model.term.LambdaTerm;
@@ -49,4 +50,31 @@ class LambdaParserTest {
 						)
 				));
 	}
+	@Test
+	void complicatedTerm() {
+		LambdaParser parser = new LambdaParser("(λx.λy.x y 5)(λz.z)(true)");
+		assertEquals(parser.parse().unwrap(),
+				new AppTerm(
+						new AppTerm(
+								new AbsTerm(
+										new VarTerm("x"),
+										new AbsTerm(
+												new VarTerm("y"),
+												new AppTerm(
+														new AppTerm(
+																new VarTerm("x"),
+																new VarTerm("y")
+														),
+														new IntegerTerm(5)
+												)
+										)
+								),
+								new AbsTerm(
+										new VarTerm("z"),
+										new VarTerm("z")
+								)
+						),
+						new BooleanTerm(true)
+				));
+	}
 }