Fix: standalone inverse tags ({{^helper args}}) drop params/hash arguments

handlebars/src/main/java/com/github/jknack/handlebars/internal/TemplateBuilder.java

@@ -333,8 +333,8 @@ public Template visitUnless(final UnlessContext ctx) {
             name,
             true,
             "^",
-            Collections.emptyList(),
-            Collections.emptyMap(),
+            params(sexpr.param()),
+            hash(sexpr.hash()),
             blockParams(ctx.blockParams()),
             source(ctx));
     block.filename(source.filename());

handlebars/src/test/java/com/github/jknack/handlebars/UnlessBlockHelperArgsTest.java

@@ -0,0 +1,45 @@
+/*
+ * Handlebars.java: https://github.com/jknack/handlebars.java
+ * Apache License Version 2.0 http://www.apache.org/licenses/LICENSE-2.0
+ * Copyright (c) 2012 Edgar Espina
+ */
+package com.github.jknack.handlebars;
+
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+
+public class UnlessBlockHelperArgsTest extends AbstractTest {
+
+  /**
+   * A standalone inverted section ({@code {{^helper args}}...{{/helper}}}) invoking a custom block
+   * helper must pass through the helper's context (first param) and hash arguments the same way the
+   * matching positive section ({@code {{#helper args}}...{{/helper}}}) does.
+   */
+  @Test
+  public void unlessPassesContextAndHashArgumentsToHelper() throws IOException {
+    Helper<Object> helper =
+        (context, options) -> "context=" + context + ",scope=" + options.hash("scope");
+
+    shouldCompileTo(
+        "{{^myHelper foo scope=\"deps\"}}{{/myHelper}}",
+        $("foo", "bar"),
+        $("myHelper", helper),
+        "context=bar,scope=deps");
+  }
+
+  /**
+   * A second positional param (beyond the first, which becomes the context) must also flow through.
+   */
+  @Test
+  public void unlessPassesExtraParamsToHelper() throws IOException {
+    Helper<Object> helper =
+        (context, options) -> "context=" + context + ",param0=" + options.param(0);
+
+    shouldCompileTo(
+        "{{^myHelper foo bar}}{{/myHelper}}",
+        $("foo", "a", "bar", "b"),
+        $("myHelper", helper),
+        "context=a,param0=b");
+  }
+}