Missing icon for test files

[albyrock87]

This issue is very similar to #190 and #133 (@Monokai 2 years passed here) but I tried to summarize and write down all cases.

To summarize these are all of "test" files used for both Angular and React development.

Spec pattern:

• *.spec.ts
• *.spec.tsx
• *.spec.js
• *.spec.jsx
• *.spec.tsx.snap (this refers to https://jestjs.io/docs/snapshot-testing with Typescript)
• *.spec.jsx.snap (this refers to https://jestjs.io/docs/snapshot-testing)

Test pattern:

• *.test.ts
• *.test.tsx
• *.test.js
• *.test.jsx
• *.test.tsx.snap (this refers to https://jestjs.io/docs/snapshot-testing with Typescript)
• *.test.jsx.snap (this refers to https://jestjs.io/docs/snapshot-testing)

VSCode (seti) theme does this:

Thanks