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diff --git a/‎test/jasmine/tests/sankey_test.js
Copy file name to clipboardExpand all lines: test/jasmine/tests/sankey_test.js
+36Lines changed: 36 additions & 0 deletions b/‎test/jasmine/tests/sankey_test.js
Copy file name to clipboardExpand all lines: test/jasmine/tests/sankey_test.js
+36Lines changed: 36 additions & 0 deletions
@@ -112,6 +112,8 @@ describe('sankey tests', function() {
                 expect(fullTrace.link.target)
                     .toEqual([], 'presence of link target array is guaranteed');
 
+                expect(fullTrace.link.label)
+                    .toEqual([], 'presence of link target array is guaranteed');
             });
 
         it('\'Sankey\' specification should have proper types',
@@ -179,6 +181,40 @@ describe('sankey tests', function() {
 
         });
 
+        it('fills \'link\' labels if not specified', function() {
+
+            var fullTrace = _supply({
+                node: {
+                    label: ['a', 'b']
+                },
+                link: {
+                    source: [0, 1],
+                    target: [1, 0],
+                    value: [1, 2]
+                }
+            });
+
+            expect(Lib.isArray(fullTrace.link.label)).toBe(true, 'must be an array');
+            expect(fullTrace.link.label).toEqual(['', ''], 'an array of empty strings');
+        });
+
+        it('preserves \'link\' labels if  specified', function() {
+
+            var fullTrace = _supply({
+                node: {
+                    label: ['a', 'b']
+                },
+                link: {
+                    source: [0, 1],
+                    target: [1, 0],
+                    value: [1, 2],
+                    label: ['a', 'b']
+                }
+            });
+
+            expect(Lib.isArray(fullTrace.link.label)).toBe(true, 'must be an array');
+            expect(fullTrace.link.label).toEqual(['a', 'b'], 'an array of the supplied values');
+        });
     });
 
     describe('sankey calc', function() {