diff --git a/test/browser/tests-browserified.js b/test/browser/tests-browserified.js
index b3db7fd..0fb5184 100755
--- a/test/browser/tests-browserified.js
+++ b/test/browser/tests-browserified.js
@@ -518,7 +518,7 @@ var createPlaneRotation = common.createPlaneRotation;
 var basetess = require('./expectations/libtess.baseline.js');
 
 var rfolder = require('./rfolder.js');
-var geometryFiles = {"hourglass": require("./geometry/hourglass.js"),"letter-e": require("./geometry/letter-e.js"),"poly2tri-dude": require("./geometry/poly2tri-dude.js"),"shared-borders": require("./geometry/shared-borders.js"),"two-opposite-triangles": require("./geometry/two-opposite-triangles.js"),"two-triangles": require("./geometry/two-triangles.js")};
+var geometryFiles = {"hourglass": require("./geometry/hourglass.js"),"letter-e": require("./geometry/letter-e.js"),"poly2tri-dude": require("./geometry/poly2tri-dude.js"),"shared-borders": require("./geometry/shared-borders.js"),"shared-edge-triangles": require("./geometry/shared-edge-triangles.js"),"two-opposite-triangles": require("./geometry/two-opposite-triangles.js"),"two-triangles": require("./geometry/two-triangles.js")};
 var geometries = Object.keys(geometryFiles).map(function(filename) {
   return geometryFiles[filename];
 });
@@ -690,7 +690,7 @@ function tessellate(tess, contours, outputType, provideNormal, normal,
   return resultVerts;
 }
 
-},{"./common.js":5,"./expectations/libtess.baseline.js":6,"./geometry/hourglass.js":7,"./geometry/letter-e.js":8,"./geometry/poly2tri-dude.js":9,"./geometry/shared-borders.js":10,"./geometry/two-opposite-triangles.js":11,"./geometry/two-triangles.js":12,"./rfolder.js":4,"chai":undefined}],4:[function(require,module,exports){
+},{"./common.js":5,"./expectations/libtess.baseline.js":6,"./geometry/hourglass.js":7,"./geometry/letter-e.js":8,"./geometry/poly2tri-dude.js":9,"./geometry/shared-borders.js":10,"./geometry/shared-edge-triangles.js":11,"./geometry/two-opposite-triangles.js":12,"./geometry/two-triangles.js":13,"./rfolder.js":4,"chai":undefined}],4:[function(require,module,exports){
 
 },{}],5:[function(require,module,exports){
 /* jshint node: true */
@@ -1186,6 +1186,28 @@ module.exports = {
 },{}],11:[function(require,module,exports){
 /* jshint node: true */
 
+module.exports = {
+  // two triangles with a partially-shared edge
+  name: 'Shared-edge triangles',
+  value: [
+    // anticlockwise
+    [
+      0, 2, 0,
+      5, 2, 0,
+      2, 4, 0
+    ],
+    // clockwise
+    [
+      1, 2, 0,
+      7, 2, 0,
+      4, 0, 0
+    ]
+  ]
+};
+
+},{}],12:[function(require,module,exports){
+/* jshint node: true */
+
 module.exports = {
   // two intersecting triangles with opposite winding
   // first is anticlockwise, second is clockwise
@@ -1204,7 +1226,7 @@ module.exports = {
   ]
 };
 
-},{}],12:[function(require,module,exports){
+},{}],13:[function(require,module,exports){
 /* jshint node: true */
 
 module.exports = {
diff --git a/test/geometry/shared-edge-triangles.js b/test/geometry/shared-edge-triangles.js
new file mode 100644
index 0000000..3bd8ffc
--- /dev/null
+++ b/test/geometry/shared-edge-triangles.js
@@ -0,0 +1,20 @@
+/* jshint node: true */
+
+module.exports = {
+  // two triangles with a partially-shared edge
+  name: 'Shared-edge triangles',
+  value: [
+    // anticlockwise
+    [
+      0, 2, 0,
+      5, 2, 0,
+      2, 4, 0
+    ],
+    // clockwise
+    [
+      1, 2, 0,
+      7, 2, 0,
+      4, 0, 0
+    ]
+  ]
+};