Fix #1188 sign calculator floating point errors

src/main/java/de/hysky/skyblocker/skyblock/calculators/SignCalculator.java

@@ -6,6 +6,7 @@
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.text.Text;
 import net.minecraft.util.Formatting;
+import org.jetbrains.annotations.VisibleForTesting;
 
 import java.text.NumberFormat;
 import java.util.Locale;
@@ -26,29 +27,34 @@ public static void renderCalculator(DrawContext context, String message, int ren
         if (message.startsWith("=")) {
             message = message.substring(1);
         }
-        //only update output if new input
-        if (!message.equals(lastInput)) { //
-            try {
-                output = Calculator.calculate(message);
-            } catch (Exception e) {
-                output = -1;
-            }
-        }
+		calculate(message);
 
         render(context, message, renderX, renderY);
 
         lastInput = message;
     }
 
-    public static String getNewValue(Boolean isPrice) {
+	@VisibleForTesting
+	public static void calculate(String message) {
+		//only update output if new input
+		if (!message.equals(lastInput)) {
+			try {
+				output = Calculator.calculate(message);
+			} catch (Exception e) {
+				output = -1;
+			}
+		}
+	}
+
+    public static String getNewValue(boolean isPrice) {
         if (output == -1) {
             //if mode is not activated or just invalid equation return what the user typed in
             return lastInput;
         }
 
         //price can except decimals and exponents
         if (isPrice) {
-            return String.valueOf(output);
+            return String.valueOf(Math.round(output * 100d) / 100d);
         }
         //amounts want an integer number so round
         return Long.toString(Math.round(output));

src/test/java/de/hysky/skyblocker/utils/CalculatorTest.java

@@ -1,31 +1,42 @@
 package de.hysky.skyblocker.utils;
 
+import de.hysky.skyblocker.skyblock.calculators.SignCalculator;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 public class CalculatorTest {
-    @Test
-    void testShorthands() {
-        Assertions.assertEquals(Calculator.calculate("1k"), 1000);
-        Assertions.assertEquals(Calculator.calculate("0.12k"), 120);
-        Assertions.assertEquals(Calculator.calculate("1k + 0.12k"), 1120);
-        Assertions.assertEquals(Calculator.calculate("1 + 1s + 1k + 1m + 1b"), 1001001065);
-    }
+	@Test
+	void testShorthands() {
+		assertCalculation(1000, "1k");
+		assertCalculation(120, "0.12k");
+		assertCalculation(1120, "1k + 0.12k");
+		assertCalculation(1001001065, "1 + 1s + 1k + 1m + 1b");
+	}
 
-    @Test
-    void testPrecedence() {
-        Assertions.assertEquals(Calculator.calculate("5 + 2 * 2"), 9);
-        Assertions.assertEquals(Calculator.calculate("5 - 2 / 2"), 4);
-        Assertions.assertEquals(Calculator.calculate("5 * (1 + 2)"), 15);
-    }
+	@Test
+	void testPrecedence() {
+		assertCalculation(9, "5 + 2 * 2");
+		assertCalculation(4, "5 - 2 / 2");
+		assertCalculation(15, "5 * (1 + 2)");
+	}
 
-    @Test
-    void testImplicitMultiplication() {
-        Assertions.assertEquals(Calculator.calculate("5(2 + 2)"), 20);
-    }
+	@Test
+	void testImplicitMultiplication() {
+		assertCalculation(20, "5(2 + 2)");
+	}
 
-    @Test
-    void testImplicitClosingParenthesis() {
-        Assertions.assertEquals(Calculator.calculate("5(2 + 2"), 20);
-    }
+	@Test
+	void testImplicitClosingParenthesis() {
+		assertCalculation(20, "5(2 + 2");
+	}
+
+	@Test
+	void testFloatingPointError() {
+		SignCalculator.calculate("262.6m");
+		Assertions.assertEquals("2.626E8", SignCalculator.getNewValue(true));
+	}
+
+	private void assertCalculation(double expected, String input) {
+		Assertions.assertEquals(expected, Calculator.calculate(input));
+	}
 }