Step 1: Open your TypeScript user defined snippets: Code > Preferences > User Snippets > (select TypeScript)
Step 2: Paste this block of JSON between the 2 brackets that are already there. Make sure it's not in the commented out text.
"Start a test 'it' block for a component": {
"prefix": "itc",
"body": [
"it('Should $1',",
" inject([${2:component}], (component: ${2:component}) => {",