1 files changed, 60 insertions, 0 deletions
diff --git a/spec/javascripts/lib/utils/text_utility_spec.js.es6 b/spec/javascripts/lib/utils/text_utility_spec.js.es6
index 06b69b8ac17..4200e943121 100644
--- a/spec/javascripts/lib/utils/text_utility_spec.js.es6
+++ b/spec/javascripts/lib/utils/text_utility_spec.js.es6
@@ -46,5 +46,65 @@ require('~/lib/utils/text_utility');
         expect(gl.text.highCountTrim(45)).toBe(45);
       });
     });
+
+    describe('gl.text.insertText', () => {
+      let textArea;
+
+      beforeAll(() => {
+        textArea = document.createElement('textarea');
+        document.querySelector('body').appendChild(textArea);
+      });
+
+      afterAll(() => {
+        textArea.parentNode.removeChild(textArea);
+      });
+
+      describe('without selection', () => {
+        it('inserts the tag on an empty line', () => {
+          const initialValue = '';
+
+          textArea.value = initialValue;
+          textArea.selectionStart = 0;
+          textArea.selectionEnd = 0;
+
+          gl.text.insertText(textArea, textArea.value, '*', null, '', false);
+
+          expect(textArea.value).toEqual(`${initialValue}* `);
+        });
+
+        it('inserts the tag on a new line if the current one is not empty', () => {
+          const initialValue = 'some text';
+
+          textArea.value = initialValue;
+          textArea.setSelectionRange(initialValue.length, initialValue.length);
+
+          gl.text.insertText(textArea, textArea.value, '*', null, '', false);
+
+          expect(textArea.value).toEqual(`${initialValue}\n* `);
+        });
+
+        it('inserts the tag on the same line if the current line only contains spaces', () => {
+          const initialValue = '  ';
+
+          textArea.value = initialValue;
+          textArea.setSelectionRange(initialValue.length, initialValue.length);
+
+          gl.text.insertText(textArea, textArea.value, '*', null, '', false);
+
+          expect(textArea.value).toEqual(`${initialValue}* `);
+        });
+
+        it('inserts the tag on the same line if the current line only contains tabs', () => {
+          const initialValue = '\t\t\t';
+
+          textArea.value = initialValue;
+          textArea.setSelectionRange(initialValue.length, initialValue.length);
+
+          gl.text.insertText(textArea, textArea.value, '*', null, '', false);
+
+          expect(textArea.value).toEqual(`${initialValue}* `);
+        });
+      });
+    });
   });
 })();