diff --git a/xth/tests/pa7/coloredpoint.xi b/xth/tests/pa7/coloredpoint.xi
new file mode 100644
index 0000000..d62f85f
--- /dev/null
+++ b/xth/tests/pa7/coloredpoint.xi
@@ -0,0 +1,26 @@
+use io
+use conv
+use point
+
+class Color {
+    r, g, b: int
+}
+
+class ColoredPoint extends Point {
+    col: Color
+    color(): Color { return col }
+
+    initColoredPoint(x0: int, y0: int, c: Color): ColoredPoint {
+        col = c
+        _ = initPoint(x0, y0)
+        return this
+    }
+}
+
+main(args:int[][]) {
+    c:Color = new Color
+    c.r = 1; c.g = 2; c.b = 3;
+
+    p:Point = new ColoredPoint
+    _ = p.initPoint(1, 2)
+}
diff --git a/xth/tests/pa7/point.ixi b/xth/tests/pa7/point.ixi
new file mode 100644
index 0000000..282559f
--- /dev/null
+++ b/xth/tests/pa7/point.ixi
@@ -0,0 +1,14 @@
+// A 2D Point with integer coordinates (x,y)
+class Point {
+    move(dx: int, dy: int)
+    add(p: Point): Point
+    coords(): int, int
+    clone(): Point
+
+    // Initialize this to contain (x, y).
+    // Returns: this
+    initPoint(x: int, y: int): Point
+}
+
+// Create the point (x, y)
+createPoint(x: int, y:int): Point
diff --git a/xth/tests/pa7/point.xi b/xth/tests/pa7/point.xi
new file mode 100644
index 0000000..e967863
--- /dev/null
+++ b/xth/tests/pa7/point.xi
@@ -0,0 +1,25 @@
+class Point{ // a mutable point
+    x, y: int
+
+    move(dx: int, dy: int) {
+        x = x + dx
+        y = y + dy
+    }
+    coords(): int, int {
+        return x, y
+    }
+    add(p: Point): Point {
+        return createPoint(x + p.x, y + p.y)
+    }
+    initPoint(x0: int, y0: int): Point {
+        x = x0
+        y = y0
+        return this
+    }
+    clone(): Point { return createPoint(x, y) }
+}
+
+createPoint(x: int, y:int): Point {
+    return new Point.initPoint(x, y)
+}
+