Set comment-column variable to 0 for the tests.

tests/jtsx-tests.el

@@ -25,6 +25,7 @@ Turn this buffer in MODE mode if supplied or defaults to jtsx-tsx-mode."
   (with-temp-buffer
     (let ((inhibit-message t)
           (indent-tabs-mode nil)
+          (comment-column 0)
           (js-indent-level indent-offset)
           (typescript-ts-mode-indent-offset indent-offset))
       (if mode (funcall mode) (jtsx-tsx-mode))
@@ -281,28 +282,28 @@ Turn this buffer in MODE mode if supplied or defaults to jtsx-tsx-mode."
 (ert-deftest jtsx-test-comment-js-enclosing-jsx-at-point ()
   (let ((set-point #'(lambda () (goto-char 0)))
         (content "(<A></A>);")
-        (result "(<A></A>);                      // "))
+        (result "(<A></A>); // "))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-jsx-mode) result))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-tsx-mode) result))))
 
 (ert-deftest jtsx-test-comment-jsx-at-point ()
   (let ((set-point #'(lambda () (progn (goto-char 0) (forward-line 1))))
         (content "(\n<A>\n</A>\n);")
-        (result "(\n<A>                             {/*  */}\n</A>\n);"))
+        (result "(\n<A> {/*  */}\n</A>\n);"))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-jsx-mode) result))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-tsx-mode) result))))
 
 (ert-deftest jtsx-test-comment-jsx-at-attribute-point ()
   (let ((set-point #'(lambda () (progn (goto-char 8))))
         (content "(\n<A attr>\n</A>\n);")
-        (result "(\n<A attr>                        {/*  */}\n</A>\n);"))
+        (result "(\n<A attr> {/*  */}\n</A>\n);"))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-jsx-mode) result))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-tsx-mode) result))))
 
 (ert-deftest jtsx-test-comment-jsx-attribute-at-point ()
   (let ((set-point #'(lambda () (progn (goto-char 8))))
         (content "(\n<A\n attr\n>\n</A>\n);")
-        (result "(\n<A\n attr                           /*  */\n>\n</A>\n);"))
+        (result "(\n<A\n attr /*  */\n>\n</A>\n);"))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-jsx-mode) result))
     (should (equal (comment-dwim-into-buffer content set-point #'jtsx-tsx-mode) result))))