From f45f27ae6cdbfb18dfdf146c4afda1f7228f03e5 Mon Sep 17 00:00:00 2001
From: Kristian Evers <kristianevers@gmail.com>
Date: Sun, 11 Mar 2018 12:40:33 +0100
Subject: Add Web Mercator test case

---
 nad/testvarious                 | 10 ++++++++++
 nad/tv_out.dist                 |  3 +++
 test/gie/4D-API_cs2cs-style.gie | 14 ++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/nad/testvarious b/nad/testvarious
index 8b3c14ac..30d1402f 100755
--- a/nad/testvarious
+++ b/nad/testvarious
@@ -883,6 +883,16 @@ $EXE -f '%0.3f' \
 15011335.76413978 -8729502.054111844
 20015114.352186374 -11409566.822831295
 EOF
+echo  "##############################################################" >> ${OUT}
+echo  "Test Web Mercator to avoid issue #834 in the future" >> ${OUT}
+#
+$EXE -f '%0.3f' \
+    +proj=utm +zone=15 +datum=NAD83 \
+    +to +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 \
+    +k=1.0 +units=m +nadgrids=@null \
+ -E >> ${OUT} <<EOF
+487147.594520173 4934316.46263998
+EOF
 
 
 # Done!
diff --git a/nad/tv_out.dist b/nad/tv_out.dist
index 4dff3a63..743eeabe 100644
--- a/nad/tv_out.dist
+++ b/nad/tv_out.dist
@@ -433,3 +433,6 @@ Test patterson inverse projection
 10007557.176093187 -5366413.421153781	90.000	-45.000 0.000
 15011335.76413978 -8729502.054111844	135.000	-67.500 0.000
 20015114.352186374 -11409566.822831295	180.000	-90.000 0.000
+##############################################################
+Test Web Mercator to avoid issue #834 in the future
+487147.594520173 4934316.46263998	-10370728.796	5552839.742 -0.000
diff --git a/test/gie/4D-API_cs2cs-style.gie b/test/gie/4D-API_cs2cs-style.gie
index 66da0633..4b0ecb60 100644
--- a/test/gie/4D-API_cs2cs-style.gie
+++ b/test/gie/4D-API_cs2cs-style.gie
@@ -186,4 +186,18 @@ tolerance 20 cm
 accept    7.438632495 46.951082877
 expect    2600000.0  1200000.0
 -------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+Test that Google's Web Mercator works as intended (see #834 for details).
+-------------------------------------------------------------------------------
+operation   proj=pipeline step init=epsg:26915 inv step init=epsg:3857
+-------------------------------------------------------------------------------
+tolerance   20 cm
+accept      487147.594520173    4934316.46263998
+expect      -10370728.80        5552839.74
+
+accept      487147.594520173    4934316.46263998    0
+expect      -10370728.80        5552839.74          0
+-------------------------------------------------------------------------------
+
 </gie>
-- 
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