Added unit tests, documentation and function descriptions across the board. Increased cyclop complexity threshold to 15 which is a bit more sane than 10 and excluded _test.go files from linters.

internal/fetcher/worker_ftsMock.go

@@ -13,6 +13,8 @@ import (
 	"git.avsdev.uk/Go/job-search/internal/util"
 )
 
+// runFTSMock polls the mock Find a Tender server every configured interval
+// until ctx is cancelled.
 func runFTSMock(
 	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
 ) error {
@@ -26,6 +28,9 @@ func runFTSMock(
 	return w.Run(ctx, since)
 }
 
+// fetchFTSMock fetches everything updated since since from the mock Find a
+// Tender server. Finding nothing returns ErrNoNewReleases, so the worker still
+// moves its checkpoint on.
 func fetchFTSMock(
 	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
 ) error {