diff --git a/src/interpreter/LispInterpreter.java b/src/interpreter/LispInterpreter.java
index 9d42e57..7449b06 100644
--- a/src/interpreter/LispInterpreter.java
+++ b/src/interpreter/LispInterpreter.java
@@ -21,7 +21,7 @@ public class LispInterpreter {
         this.errorManager = this.environment.getErrorManager();
         this.output = environment.getOutput();
     }
-    
+
     public void setInput(InputStream input, String inputName) {
         environment.setInput(input);
         environment.setInputName(inputName);
diff --git a/src/interpreter/LispInterpreterBuilder.java b/src/interpreter/LispInterpreterBuilder.java
index 801324e..e37f819 100644
--- a/src/interpreter/LispInterpreterBuilder.java
+++ b/src/interpreter/LispInterpreterBuilder.java
@@ -29,8 +29,8 @@ public interface LispInterpreterBuilder {
 
     void setCriticalOutputDecorator(Function<String, String> criticalOutputDecorator);
 
-    default void reset() {}
-
     LispInterpreter build();
 
+    default void reset() {}
+
 }
diff --git a/src/interpreter/LispInterpreterBuilderImpl.java b/src/interpreter/LispInterpreterBuilderImpl.java
index 76b7486..197f299 100644
--- a/src/interpreter/LispInterpreterBuilderImpl.java
+++ b/src/interpreter/LispInterpreterBuilderImpl.java
@@ -158,7 +158,7 @@ public class LispInterpreterBuilderImpl implements LispInterpreterBuilder {
     private LispInterpreter createInterpreter() {
         return isInteractive ? new InteractiveLispInterpreter() : new LispInterpreter();
     }
-    
+
     public static class InterpreterAlreadyBuiltException extends CriticalLispException {
 
         private static final long serialVersionUID = 1L;
diff --git a/test/interpreter/LispInterpreterBuilderTester.java b/test/interpreter/LispInterpreterBuilderTester.java
index c0cfb34..e0fa3df 100644
--- a/test/interpreter/LispInterpreterBuilderTester.java
+++ b/test/interpreter/LispInterpreterBuilderTester.java
@@ -67,12 +67,22 @@ public class LispInterpreterBuilderTester {
         builder.build();
         builder.build();
     }
-    
+
+    @Test
     public void interpreterAlreadyBuiltException_HasMessage() {
-       InterpreterAlreadyBuiltException e = new InterpreterAlreadyBuiltException(); 
-       
-       assertNotNull(e.getMessage());
-       assertTrue(e.getMessage().length() > 0);
+        InterpreterAlreadyBuiltException e = new InterpreterAlreadyBuiltException();
+
+        assertNotNull(e.getMessage());
+        assertTrue(e.getMessage().length() > 0);
+    }
+
+    @Test(expected = InterpreterAlreadyBuiltException.class)
+    public void resetNormallyDoesNothing() {
+        builder = new LispInterpreterBuilderImpl();
+
+        builder.build();
+        builder.reset();
+        builder.build();
     }
 
 }
diff --git a/test/main/MainTester.java b/test/main/MainTester.java
index 05c7b33..db401e4 100644
--- a/test/main/MainTester.java
+++ b/test/main/MainTester.java
@@ -1,10 +1,7 @@
 package main;
 
-import static org.junit.Assert.*;
-
 import org.junit.*;
 
-
 public class MainTester {
 
     @Before
@@ -13,9 +10,4 @@ public class MainTester {
     @After
     public void tearDown() throws Exception {}
 
-    @Test
-    public void test() {
-        fail("Not yet implemented");
-    }
-
 }