Input group - two inputs close to each other

working workaround:

<div class="input-group">
    <input type="text" class="form-control input-sm" value="test1" />
    <span class="input-group-btn" style="width:0px;"></span>
    <input type="text" class="form-control input-sm" value="test2" />
</div>

downside: no border-collapse between the two text-fields, but they keep next to each other

http://jsfiddle.net/EfC26/

Update

thanks to Stalinko

This technique allows to glue more than 2 inputs. Border-collapsing is achieved using "margin-left: -1px" (-2px for the 3rd input and so on)

<div class="input-group">
  <input type="text" class="form-control input-sm" value="test1" />
  <span class="input-group-btn" style="width:0px;"></span>
  <input type="text" class="form-control input-sm" value="test2" style="margin-left:-1px" />
  <span class="input-group-btn" style="width:0px;"></span>
  <input type="text" class="form-control input-sm" value="test2" style="margin-left:-2px" />
</div>

http://jsfiddle.net/yLvk5mn1/1/

It almost never makes intuitive sense to have two inputs next to each other without labels. Here is a solution with labels mixed in, which also works quite well with just a minor modification to existing Bootstrap styles.

Preview:

HTML:

<div class="input-group">
  <span class="input-group-addon">Between</span>
  <input type="text" class="form-control" placeholder="Type something..." />
  <span class="input-group-addon" style="border-left: 0; border-right: 0;">and</span>
  <input type="text" class="form-control" placeholder="Type something..." />
</div>

CSS:

.input-group-addon {
  border-left-width: 0;
  border-right-width: 0;
}
.input-group-addon:first-child {
  border-left-width: 1px;
}
.input-group-addon:last-child {
  border-right-width: 1px;
}

JSFiddle: http://jsfiddle.net/yLvk5mn1/31/