feat: update structure

cs2030s/labs/Lab5/Test3.java

@@ -0,0 +1,71 @@
+import java.io.PrintStream;
+import java.io.ByteArrayOutputStream;
+
+public class Test3 {
+  public static void main(String[] args) {
+    CS2030STest we = new CS2030STest();
+    
+    cs2030s.fp.Immutator<Integer,Integer> inc = new cs2030s.fp.Immutator<>() {
+      public Integer invoke(Integer p) {
+        return p+1;
+      }
+    };
+    cs2030s.fp.Immutator<Integer,Integer> inv = new cs2030s.fp.Immutator<>() {
+      public Integer invoke(Integer p) {
+        return 1/p;
+      }
+    };
+    cs2030s.fp.Immutator<Number,Integer> incNum = new cs2030s.fp.Immutator<>() {
+      public Number invoke(Integer p) {
+        return p+1;
+      }
+    };
+    cs2030s.fp.Immutator<Number,Integer> invNum = new cs2030s.fp.Immutator<>() {
+      public Number invoke(Integer p) {
+        return 1/p;
+      }
+    };
+    
+    we.expect(
+      "Actually.<Integer>ok(0).transform(inc)",
+      cs2030s.fp.Actually.<Integer>ok(0).transform(inc).toString(),
+      "<1>"
+    );
+    we.expect(
+      "Actually.<Integer>ok(0).transform(inv)",
+      cs2030s.fp.Actually.<Integer>ok(0).transform(inv).toString(),
+      "[java.lang.ArithmeticException] / by zero"
+    );
+    we.expect(
+      "Actually.ok(0).transform(inc)",
+      cs2030s.fp.Actually.ok(0).transform(inc).toString(),
+      "<1>"
+    );
+    we.expect(
+      "Actually.ok(0).transform(inv)",
+      cs2030s.fp.Actually.ok(0).transform(inv).toString(),
+      "[java.lang.ArithmeticException] / by zero"
+    );
+    
+    we.expect(
+      "Actually.<Integer>ok(0).transform(incNum)",
+      cs2030s.fp.Actually.<Integer>ok(0).transform(incNum).toString(),
+      "<1>"
+    );
+    we.expect(
+      "Actually.<Integer>ok(0).transform(invNum)",
+      cs2030s.fp.Actually.<Integer>ok(0).transform(invNum).toString(),
+      "[java.lang.ArithmeticException] / by zero"
+    );
+    we.expect(
+      "Actually.ok(0).transform(incNum)",
+      cs2030s.fp.Actually.ok(0).transform(incNum).toString(),
+      "<1>"
+    );
+    we.expect(
+      "Actually.ok(0).transform(invNum)",
+      cs2030s.fp.Actually.ok(0).transform(invNum).toString(),
+      "[java.lang.ArithmeticException] / by zero"
+    );
+  }
+}