Separate tests by blank line... Test output...
produces more readable verbose output, particularly for FractionCalculatorTest ERRORs that
have multiple line.

...Test output looks fine:

$ java -ea FractionTest
FractionTest tests verbose output:
test "Divide by zero: that 1/0 should throw an IllegalArgumentException exception" passes.

test ".equal method: that 1/2 .equals 1/2" passes.

test ".equal method: that 1/2 equals 3/6" passes.

test ".equal method: that -1/2 equals 1/-2" passes.

test ".equal method: that -1/-2 equals 1/2" passes.

test ".equal method: that 4/-8 does not equal 1/2" passes.

test "Multiply: that multiplying 1/2 by 3/5 gives 3/10" passes.

test "Divide: that (2/9) / (3/5) gives 10/27" passes.

test "Divide by zero: that (1/1) / (0/1) should throw an IllegalArgumentException exception" passes.

test "Add: that 1/2 + 1/4 gives 3/4" passes.

test "Add: that 2/9 + 3/5 gives 37/45" passes.

test "Subtract: that 2/9 - 3/5 gives -17/45" passes.

test "AbsValue: that absValue(-7/9) = 7/9" passes.

test "Negate: that Negate(7/9) = -7/9" passes.

test ".toString(): that (6/5).toString() is equal to "6/5" " passes.

test ".toString(): that (6/1).toString() is equal to "6" " passes.

test ".toString(): that (-1/4).toString() is equal to "-1/4" " passes.

test ".toString(): that (1/-4).toString() is equal to "-1/4" " passes.

FractionTest: All tests pass
Deal with divide by zero ... Test output...
actually reset calculator on an ERROR (rather than saying it but not
doing it)

...Test output looks fine:

$ java -ea FractionCalculatorTest
FractionTestCalculator tests verbose output:
test "Simple parsing and operation: input of "1/2 * 3/4" should give "3/8". Actually "3/8" is output." passes.

test "Simple parsing and operation: input of "1/2 / 3/4" should give "2/3". Actually "2/3" is output." passes.

test "Simple parsing and operation: input of " 1/2   +  -1/4 " should give "1/4". Actually "1/4" is output." passes.

test "Simple parsing and operation: input of "1/2 - 3/4" should give "-1/4". Actually "-1/4" is output." passes.

test "Entering an invalid fraction input of "1/0" should produce an ERROR. Actually "
ERROR you have specified a fraction 1/0 with a zero denominator.
	Resetting calculator to its initial state (no operator and 0 as value)" is output." passes.

test "Try to divide by zero "1/2 / 0/3" should produce an ERROR. Actually "
ERROR you cannot divide by zero.
	Resetting calculator to its initial state (no operator and 0 as value)" is output." passes.

FractionCalculatorTest: All tests pass