add test case for #1

Values are calculated, however not present in plot. Further research needed

src/main/java/satisfactory/Test.java

@@ -122,10 +122,10 @@ public class Test {
 		planFor(Database.UraniumFuelRod, 1, "fuelrod");
 
 		planFor(Database.FusedModularFrame, 100, "fusedFrame");
-		planFor(Database.SteelIngot, 100, "steelIngot");
+		planFor(Database.SteelIngot, 81.75, "steelIngot");
 	}
 
-	private static void planFor(Item item, int amount, String name) {
+	private static void planFor(Item item, double amount, String name) {
 		SumResult plan = SumResult.sum(new Production(item, amount));
 		plot2(plan.getProduction(), name);
 		javaPlot(name);

src/main/java/satisfactory/items/Production.java

@@ -2,9 +2,9 @@ package satisfactory.items;
 
 public class Production {
 	private final Item item;
-	private final int amount;
+	private final double amount;
 
-	public Production(Item item, int amount) {
+	public Production(Item item, double amount) {
 		this.item = item;
 		this.amount = amount;
 	}
@@ -13,7 +13,7 @@ public class Production {
 		return item;
 	}
 
-	public int getAmount() {
+	public double getAmount() {
 		return amount;
 	}
 }

src/main/java/satisfactory/items/Recipe.java

@@ -176,7 +176,7 @@ public class Recipe {
 		return product.getRecipe().outputs.get(product) * runs;
 	}
 
-	public SumResult sum(Item target, int prodPerMinute) {
+	public SumResult sum(Item target, double prodPerMinute) {
 		Graph<Item, DefaultWeightedEdge> buildGraph = buildGraph(target);
 		Graph<Item, ProductionEdge> production = new DefaultDirectedWeightedGraph<>(ProductionEdge.class);
 		Map<Item, Double> map = new HashMap<>();

src/test/java/satisfactory/items/ItemTest.java

@@ -99,4 +99,21 @@ class ItemTest {
 			assertEquals(amount, calculations.get(item), 0.01, item.getName());
 		});
 	}
+    @Test
+    void uraniumFuelRodWithSteelIngotParents(){
+        Map<Item, Double> ref = new HashMap<>();
+        ref.put(Database.SteelIngot, 81.75);
+        ref.put(Database.IronOre, 81.75);
+        ref.put(Database.Coal, 81.75);
+        compareProductions(Database.UraniumFuelRod, 1, ref);
+    }
+
+    private void compareProductions(Item targetItem, int amount, Map<Item, Double> ref) {
+        Map<Item, Double> sum = SumResult.sum(new Production(targetItem, amount)).getMap();
+
+        ref.forEach((item, aDouble) -> {
+            assertTrue(sum.containsKey(item));
+            assertEquals(aDouble, sum.get(item));
+        });
+    }
 }