From 0518e1624cae35738e71c98ef6150105524871f3 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 2 Mar 2016 18:35:52 +0000
Subject: Throw more informative exception when relationship is missing

---
 .../org/zwobble/mammoth/tests/util/MammothAsserts.java    | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 src/test/java/org/zwobble/mammoth/tests/util/MammothAsserts.java

(limited to 'src/test/java/org/zwobble/mammoth/tests/util/MammothAsserts.java')

diff --git a/src/test/java/org/zwobble/mammoth/tests/util/MammothAsserts.java b/src/test/java/org/zwobble/mammoth/tests/util/MammothAsserts.java
new file mode 100644
index 0000000..2439ee2
--- /dev/null
+++ b/src/test/java/org/zwobble/mammoth/tests/util/MammothAsserts.java
@@ -0,0 +1,15 @@
+package org.zwobble.mammoth.tests.util;
+
+import org.zwobble.mammoth.internal.util.Casts;
+
+public class MammothAsserts {
+    public static <T extends Throwable> T assertThrows(Class<T> exceptionType, Action action) throws T {
+        try {
+            action.run();
+            throw new AssertionError("Expected exception");
+        } catch (RuntimeException exception) {
+            return Casts.tryCast(exceptionType, exception)
+                .orElseThrow(() -> exception);
+        }
+    }
+}
-- 
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