Abstract: An exemplary embodiment of the liner top test tool comprises a mandrel that is coupled to a sealing assembly, which contains at least one radially extendable sealing element, and a test tool support which is axially displaceable in relation to the mandrel. The test tool support contains at least one shearable element preventing axial movement of the test tool support in relation to the mandrel. The mandrel has at least one axial groove that can be coupled to the test tool support in order to limit the amount of axial movement between the two components. Once the tool is in place on a liner top, the shearing of the shearable element will activate the tool by allowing the mandrel to be displaced axially in relation to the test tool support thereby applying axial pressure on the sealing element causing it to radially extend and seal the bore of the liner.