From ba79a252983fd8d0f231483766200da8ae987c70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6nke=20Ludwig?= <sludwig@rejectedsoftware.com>
Date: Tue, 16 Apr 2019 10:09:27 +0200
Subject: [PATCH] Add explicit unit test for commonAlignment.

---
 source/taggedalgebraic/taggedunion.d | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/source/taggedalgebraic/taggedunion.d b/source/taggedalgebraic/taggedunion.d
index 22b8059..49803bc 100644
--- a/source/taggedalgebraic/taggedunion.d
+++ b/source/taggedalgebraic/taggedunion.d
@@ -791,6 +791,21 @@ private size_t commonAlignment(TYPES...)()
 	return ret;
 }
 
+unittest {
+	align(2) struct S1 { ubyte x; }
+	align(4) struct S2 { ubyte x; }
+	align(8) struct S3 { ubyte x; }
+
+	static if (__VERSION__ > 2076) { // DMD 2.076 ignores the alignment
+		assert(commonAlignment!S1 == 2);
+		assert(commonAlignment!S2 == 4);
+		assert(commonAlignment!S3 == 8);
+		assert(commonAlignment!(S1, S3) == 8);
+		assert(commonAlignment!(S1, S2, S3) == 8);
+		assert(commonAlignment!(S2, S2, S1) == 4);
+	}
+}
+
 package void rawEmplace(T)(void[] dst, ref T src)
 {
 	T[] tdst = () @trusted { return cast(T[])dst[0 .. T.sizeof]; } ();