feat: cover basic functionality of DiscountedItem (lines coverage is not 100% though),

known issue: Item.equals() compares floating point numbers using '==' (DEFECT),
fixed: discountTo Date is correctly assigned in constructor DiscountedItem(int, String, float, String, int, Date, Date)
1 job for Ukol2_novak110 in 26 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #19597
unitTests

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