Update scanner test.

A couple of corner cases behave slightly differently on enso:
- Searching for "^" in "" will now return null instead of ""
- When findInLine finds a pattern that is at the very end of the
  line. It does not skip over to the next line.

bug: 25996036

Change-Id: I606704a1995332f6506e85931a3f5dfccc13c250
1 file changed