Added tests for Piece and added a valid move check.

.idea/libraries/junit.xml

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+<component name="libraryTable">
+  <library name="junit" type="repository">
+    <properties maven-id="junit:junit:4.13.2" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.13.2/junit-4.13.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

src/Assignments/A1/models/Board.java

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+package Assignments.A1.models;
+
+/**
+ * This class keeps track of the current state (whether in permutation or not) of the board.
+ *
+ * @author Jonathan Turner
+ * @version Spring 2024
+ */
+public class Board {
+
+    private final Piece[] pieces;
+
+    /**
+     * Default constructor that generates the solved board.
+     *
+     * @precondition none
+     * @postcondition a solved board is created.
+     */
+    public Board() {
+        this.pieces = new Piece[9];
+        for (int index = 1; index <= 9; index++) {
+            this.pieces[index-1] = new Piece(index-1, index);
+        }
+    }
+
+    /**
+     * Constructor used to create a board with a pre-provided board.
+     *
+     * @precondition board.length == 9
+     * @postcondition a board is created with given locations
+     *
+     * @param board the provided state of the board.
+     */
+    public Board(Piece[] board) {
+        if (board.length != 9) {
+            throw new IllegalArgumentException("The board must be a array size of 9.");
+        }
+
+        this.pieces = board;
+    }
+
+
+    public boolean isTaken(int loc) {
+        if (invalidLocation(loc)) {
+            throw new IllegalArgumentException("Invalid location specified. Valid Range: 0 <= Location <= 8");
+        }
+        return (this.pieces[loc].getValue() != 0);
+    }
+
+    /**
+     * Returns the array of pieces.
+     *
+     * @precondition none
+     * @postcondition none
+     * @return the array of pieces.
+     */
+    public Piece[] getPieces() {
+        return this.pieces;
+    }
+
+
+    /* Private Methods Below. End of Java Docs. */
+
+    /* Checks if a given location is a valid location. */
+    private boolean invalidLocation(int loc) {
+        return (loc >= 0 && loc <= 8);
+    }
+}

src/Assignments/A1/tests/Piece/TestConstructor.java

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+package Assignments.A1.tests.Piece;
+
+import static org.junit.Assert.*;
+import Assignments.A1.models.Piece;
+import org.junit.Test;
+
+/**
+ * Tests the constructor for Piece.java.
+ *
+ * @author Jonathan Turner
+ * @version Spring 2024
+ */
+public class TestConstructor {
+
+    @Test
+    public void testZeroValue() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new Piece(5, 0);
+        });
+    }
+
+    @Test
+    public void testOneValue() {
+        Piece test = new Piece(5, 1);
+        assertEquals(1, test.getValue());
+    }
+
+    @Test
+    public void testEightValue() {
+        Piece test = new Piece(5, 8);
+        assertEquals(8, test.getValue());
+    }
+
+    @Test
+    public void testNineValue() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new Piece(5, 9);
+        });
+    }
+
+    @Test
+    public void testNegativeLoc() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new Piece(-1, 5);
+        });
+    }
+
+    @Test
+    public void testZeroLoc() {
+        Piece test = new Piece(0, 5);
+        assertEquals(0, test.getLoc());
+    }
+
+    @Test
+    public void testEightLoc() {
+        Piece test = new Piece(8, 5);
+        assertEquals(8, test.getLoc());
+    }
+
+    @Test
+    public void testNineLoc() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            new Piece(9, 5);
+        });
+    }
+
+
+    @Test
+    public void validParams() {
+        Piece test = new Piece(3, 6);
+        assertEquals(3, test.getLoc());
+        assertEquals(6, test.getValue());
+    }
+
+}

src/Assignments/A1/tests/Piece/TestMoveTo.java

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+package Assignments.A1.tests.Piece;
+
+import static org.junit.Assert.*;
+import Assignments.A1.models.Piece;
+import org.junit.Test;
+
+/**
+ * Tests the moveTo() for Piece.java.
+ *
+ * @author Jonathan Turner
+ * @version Spring 2024
+ */
+public class TestMoveTo {
+
+    @Test
+    public void testNegativeMove() {
+        Piece test = new Piece(3, 5);
+        assertThrows(IllegalArgumentException.class, () -> {
+            test.moveTo(-1);
+        });
+    }
+
+    @Test
+    public void testZeroMove() {
+        Piece test = new Piece(3, 5);
+        test.moveTo(0);
+        assertEquals(0, test.getLoc());
+    }
+
+    @Test
+    public void testEightMove() {
+        Piece test = new Piece(5, 5);
+        test.moveTo(8);
+        assertEquals(8, test.getLoc());
+    }
+
+    @Test
+    public void testNineMove() {
+        Piece test = new Piece(3, 5);
+        assertThrows(IllegalArgumentException.class, () -> {
+            test.moveTo(9);
+        });
+    }
+
+    @Test
+    public void MoveToSameLocation() {
+        Piece test = new Piece(3, 5);
+        assertThrows(IllegalArgumentException.class, () -> {
+            test.moveTo(3);
+        });
+    }
+
+    @Test
+    public void ValidMove() {
+        Piece test = new Piece(3, 5);
+        test.moveTo(4);
+        assertEquals(4, test.getLoc());
+    }
+
+}