Fixed #1946 - maths helper now makes a last-ditch attempt to parse th…

…e toString() result from an unknown value type into a number, only returning 0 if this fails. This means that renderable dates formatted as epoch will be parseable.

src/main/java/com/github/tomakehurst/wiremock/extension/responsetemplating/helpers/MathsHelper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021 Thomas Akehurst
+ * Copyright (C) 2021-2022 Thomas Akehurst
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -75,11 +75,11 @@ private static BigDecimal coerceToBigDecimal(Object value) {
       return BigDecimal.valueOf((float) value);
     }
 
-    if (value instanceof CharSequence) {
+    try {
       return new BigDecimal(value.toString());
+    } catch (NumberFormatException e) {
+      return new BigDecimal(0);
     }
-
-    return new BigDecimal(0);
   }
 
   private static Object reduceToPrimitiveNumber(BigDecimal value) {

src/test/java/com/github/tomakehurst/wiremock/extension/responsetemplating/helpers/MathsHelperTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021 Thomas Akehurst
+ * Copyright (C) 2021-2022 Thomas Akehurst
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@
 import static org.hamcrest.Matchers.closeTo;
 import static org.hamcrest.Matchers.is;
 
+import java.util.Date;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
@@ -101,4 +102,12 @@ public void dividesTwoIntegers() throws Exception {
   public void modsTwoIntegers() throws Exception {
     assertThat(renderHelperValue(helper, 11, "%", 3), is(2));
   }
+
+  @Test
+  void coercesEpochFormattedRenderableDateParameterCorrectly() throws Exception {
+    Date date = new Date(1663258226792L);
+    assertThat(
+        renderHelperValue(helper, new RenderableDate(date, "epoch", null), "+", 0),
+        is(1663258226792L));
+  }
 }