added ofOptional method and test

src/main/java/com/jasongoodwin/monads/Try.java

@@ -32,6 +32,18 @@ public static <U> Try<U> ofFailable(TrySupplier<U> f) {
         }
     }
 
+    public static <U> Try<U> ofOptional(Optional<U> op, Throwable e) {
+        if(op.isPresent()) {
+            return new Success<>(op.get());
+        } else {
+            return new Failure<>(e);
+        }
+    }
+
+    public static <U> Try<U> ofOptional(Optional<U> op) {
+        return ofOptional(op, new IllegalArgumentException("Missing Value"));
+    }
+
     /**
      * Transform success or pass on failure.
      * Takes an optional type parameter of the new type.

src/test/java/com/jasongoodwin/monads/TryTest.java

@@ -250,6 +250,20 @@ public void itShouldThrowNewExceptionWhenInvokingOrElseThrowOnFailure() throws T
         });
     }
 
+    @Test
+    public void itShouldCreateSuccessFromPopulatedOptional() throws Throwable {
+        Try<String> t = Try.ofOptional(Optional.of("foobar"), new IllegalArgumentException("Missing Value"));
+        assertTrue(t.isSuccess());
+        assertEquals(t.get(), "foobar");
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void itShouldCreateFailureFromEmptyOptional() throws Throwable {
+        Try<String> t = Try.ofOptional(Optional.empty(), new IllegalArgumentException("Missing Value"));
+
+        t.get();
+    }
+
     public void itShouldNotThrowNewExceptionWhenInvokingOrElseThrowOnSuccess() throws Throwable {
         Try<String> t = Try.ofFailable(() -> "Ok");