Increase test coverage and tweak error messages

src/edu/kit/informatik/model/RailwayNetwork.java

@@ -69,7 +69,7 @@ public class RailwayNetwork {
      */
     public int addSwitch(final Vector2D start, final Vector2D end1, final Vector2D end2) throws InvalidInputException {
         if (start.distanceTo(end1) == 0 || start.distanceTo(end2) == 0 || end1.distanceTo(end2) == 0) {
-            return -1;
+            throw new InvalidInputException("switch has length zero");
         }
         if (rails.isEmpty()) {
             Switch newSwitch = new Switch(start, end1, end2, 1);
@@ -80,7 +80,7 @@ public class RailwayNetwork {
             long end1PossibleConnections = rails.values().stream().filter((rail) -> rail.canConnectTo(end1)).count();
             long end2PossibleConnections = rails.values().stream().filter((rail) -> rail.canConnectTo(end2)).count();
             if (startPossibleConnections == 2 || end1PossibleConnections == 2 || end2PossibleConnections == 2) {
-                return -1; // TODO better error msg?
+                throw new InvalidInputException("switch endpoint would connect to two other rails");
             }
             for (Rail rail : rails.values()) {
                 if (rail.canConnectTo(start) || rail.canConnectTo(end1) || rail.canConnectTo(end2)) {
@@ -93,7 +93,7 @@ public class RailwayNetwork {
                     return newSwitch.getIdentifier();
                 }
             }
-            return -1;
+            throw new InvalidInputException("switch not connected to other rails");
         }
     }
 

src/edu/kit/informatik/model/Track.java

@@ -1,5 +1,7 @@
 package edu.kit.informatik.model;
 
+import edu.kit.informatik.ui.InvalidInputException;
+
 import java.util.Objects;
 
 /**
@@ -17,12 +19,12 @@ public final class Track extends Rail {
      * @param start start position of the track
      * @param end end position of the track
      * @param id identifier to use
-     * @throws IllegalArgumentException if the positions are not on a straight line
+     * @throws InvalidInputException if the positions are not on a straight line
      */
-    public Track(final Vector2D start, final Vector2D end, final int id) throws IllegalArgumentException {
+    public Track(final Vector2D start, final Vector2D end, final int id) throws InvalidInputException {
         super(id);
         if (start.getX() != end.getX() && start.getY() != end.getY()) {
-            throw new IllegalArgumentException("start and end have to be in a straight line!");
+            throw new InvalidInputException("invalid track segment: not a straight line");
         }
         this.start = start;
         this.end = end;
@@ -40,10 +42,7 @@ public final class Track extends Rail {
 
     @Override
     public boolean canConnectToRail(Rail rail) {
-        if (rail == null) {
-            System.out.println("hey"); // TODO: remove
-        }
-        return rail.canConnectTo(start) || rail.canConnectTo(end);
+        return rail != null && rail.canConnectTo(start) || rail.canConnectTo(end);
     }
 
     @Override
@@ -82,7 +81,7 @@ public final class Track extends Rail {
             return new Vector2D(Long.signum((long) start.getX() - (long) end.getX()),
                     Long.signum((long) start.getY() - (long) end.getY()));
         } else {
-            throw new IllegalArgumentException();
+            throw new IllegalArgumentException("can only compute direction from track ends");
         }
     }
 

src/edu/kit/informatik/model/Train.java

@@ -195,7 +195,7 @@ public final class Train {
      * @return whether this train is placed on a rail network
      */
     public boolean isPlaced() {
-        return position != null && direction != null;
+        return position != null && direction != null && occupiedRails != null;
     }
 
     /**
@@ -316,6 +316,7 @@ public final class Train {
             // we evidently just moved into another rail
             Rail[] nextTouchingRails = railNetwork.findTouchingRails(nextPosition);
             Rail[] alreadyTouchingRails = railNetwork.findTouchingRails(secondToLastPosition);
+            // TODO: do we need all of these cases???
             if (nextTouchingRails[0] == alreadyTouchingRails[0]) {
                 occupiedRails.add(nextTouchingRails[0]);
             } else if (nextTouchingRails.length == 2) {

src/edu/kit/informatik/model/Vector2D.java

@@ -132,7 +132,7 @@ public class Vector2D {
     @Override
     public boolean equals(final Object obj) {
         if (obj != null && getClass().equals(obj.getClass())) {
-            final Vector2D point = (Vector2D) obj;
+            Vector2D point = (Vector2D) obj;
 
             return x == point.x && y == point.y;
         }

src/edu/kit/informatik/ui/CommandLine.java

@@ -25,7 +25,7 @@ public class CommandLine {
         ModelRailwaySimulation simulation = new ModelRailwaySimulation();
 
         while (true) {
-            final String input = Terminal.readLine();
+            String input = Terminal.readLine();
             if (input == null) {
                 break; // TODO remove
             }
@@ -33,8 +33,13 @@ public class CommandLine {
                 continue; // TODO remove
             }
 
-            if (input.equals(EXIT)) {
-                break;
+            if (input.startsWith(EXIT)) {
+                if (input.length() != EXIT.length()) {
+                    Terminal.printError("space after exit command");
+                    continue;
+                } else {
+                    break;
+                }
             }
 
             try {

stophittingyourself_output.txt

@@ -2,4 +2,4 @@
 2
 3
 4
-Error, switch not connected to existing rails
+Error, switch endpoint would connect to two other rails

testcoverage_input.txt

@@ -105,6 +105,7 @@ put train 1 at (1,0) in direction 42,42
 add track to canada
 please just do as I say >:(
 step all over my legos, you dumb program
+exit 
 delete track 5
 delete track 3
 delete track 2
@@ -146,4 +147,25 @@ step 2
 delete train 6
 add train 6 T5-Hartnick
 put train 6 at (0,0) in direction -1,0
-step 1
+step 1
+add switch (0,0) -> (0,0),(1,0)
+add switch (0,0) -> (1,0),(0,0)
+add switch (0,0) -> (1,0),(1,0)
+delete track 1
+delete track 2
+delete track 3
+add track (0,0) -> (1,0)
+add track (0,0) -> (-1,0)
+add switch (0,0) -> (0,-1),(0,1)
+add switch (0,1) -> (0,0),(0,2)
+add switch (0,1) -> (0,2),(0,0)
+add switch (1000,0) -> (1000,1),(1001,0)
+delete track 1
+delete track 2
+add track (0,0) -> (0,2)
+add track (0,2) -> (2,2)
+add track (2,2) -> (2,0)
+add track (2,0) -> (0,0)
+create engine steam T5 Worsch 9 true true
+add train 8 T5-Worsch
+put train 8 at (0,0) in direction 0,-1

testcoverage_output.txt

@@ -129,6 +129,7 @@ Error, invalid train direction
 Error, invalid add track argument syntax
 Error, unknown command
 Error, invalid step argument
+Error, space after exit command
 OK
 OK
 OK
@@ -171,3 +172,24 @@ OK
 diesel engine T5-Hartnick added to train 6
 OK
 Crash of train 6
+Error, switch has length zero
+Error, switch has length zero
+Error, switch has length zero
+OK
+OK
+OK
+1
+2
+Error, switch endpoint would connect to two other rails
+Error, switch endpoint would connect to two other rails
+Error, switch endpoint would connect to two other rails
+Error, switch not connected to other rails
+OK
+OK
+1
+2
+3
+4
+T5-Worsch
+steam engine T5-Worsch added to train 8
+Error, could not place train