Apple’s Odds in Tax Case of the Century May Sway in Court Test

Apple Inc. may only need to wait another day to get early clues about its chances of success in the biggest tax case in recent history.

The iPhone maker has been arguing its case at the European Union’s General Court to topple a record 13 billion-euro ($14.3 billion) EU tax order. This week the same panel of judges will deliver a ruling on two smaller but related challenges by Starbucks Corp. and a Fiat Chrysler Automobiles NV unit.

They’re the first in a series of cases to come to a decision as companies rail against EU Competition chief Margrethe Vestager ...