PASS text1.x.baseVal.getItem(2).value is 100
PASS text1.x.baseVal.getItem(3).value is 900
PASS text1.x.baseVal.getItem(4).value is 1000
-PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (5) is greater than or equal to the maximum bound (5)..
Check initial list state of text2
PASS text2.x.baseVal.numberOfItems is 3
PASS text2.x.baseVal.getItem(0).value is 50
PASS text2.x.baseVal.getItem(1).value is 100
PASS text2.x.baseVal.getItem(2).value is 1000
-PASS text2.x.baseVal.getItem(3) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text2.x.baseVal.getItem(3) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (3) is greater than or equal to the maximum bound (3)..
Append fourth item x=900 to the text1 x list
PASS text1.x.baseVal.appendItem(text1.x.baseVal.getItem(3)) is text1.x.baseVal.getItem(4)
PASS text1.x.baseVal.getItem(2).value is 100
PASS text1.x.baseVal.getItem(3).value is 1000
PASS text1.x.baseVal.getItem(4).value is 900
-PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (5) is greater than or equal to the maximum bound (5)..
Append first item x=500 to the text1 x list
PASS text1.x.baseVal.appendItem(text1.x.baseVal.getItem(0)) is text1.x.baseVal.getItem(4)
PASS text1.x.baseVal.getItem(2).value is 1000
PASS text1.x.baseVal.getItem(3).value is 900
PASS text1.x.baseVal.getItem(4).value is 500
-PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(5) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (5) is greater than or equal to the maximum bound (5)..
Append 'newLength1' to the text1 x list
PASS text1.x.baseVal.appendItem(newLength1) is text1.x.baseVal.getItem(5)
PASS text1.x.baseVal.getItem(3).value is 900
PASS text1.x.baseVal.getItem(4).value is 500
PASS text1.x.baseVal.getItem(5).value is 150
-PASS text1.x.baseVal.getItem(6) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(6) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (6) is greater than or equal to the maximum bound (6)..
Append third and fourth item of the text1 x list to the text2 x list
PASS text2.x.baseVal.appendItem(text1.x.baseVal.getItem(2)).value is 1000
PASS text1.x.baseVal.getItem(1).value is 100
PASS text1.x.baseVal.getItem(2).value is 500
PASS text1.x.baseVal.getItem(3).value is 150
-PASS text1.x.baseVal.getItem(4) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(4) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (4) is greater than or equal to the maximum bound (4)..
PASS text2.x.baseVal.numberOfItems is 5
PASS text2.x.baseVal.getItem(0).value is 50
PASS text2.x.baseVal.getItem(1).value is 100
PASS text2.x.baseVal.getItem(2).value is 1000
PASS text2.x.baseVal.getItem(3).value is 1000
PASS text2.x.baseVal.getItem(4).value is 900
-PASS text2.x.baseVal.getItem(5) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text2.x.baseVal.getItem(5) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (5) is greater than or equal to the maximum bound (5)..
PASS newLength2.value is 150
Shuffle around items in text1 and text2 list using appendItem, to get x=50,100,150,... in both lists
PASS text1.x.baseVal.getItem(1).value is 100
PASS text1.x.baseVal.getItem(2).value is 150
PASS text1.x.baseVal.getItem(3).value is 500
-PASS text1.x.baseVal.getItem(4) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text1.x.baseVal.getItem(4) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (4) is greater than or equal to the maximum bound (4)..
PASS text2.x.baseVal.numberOfItems is 6
PASS text2.x.baseVal.getItem(0).value is 50
PASS text2.x.baseVal.getItem(1).value is 100
PASS text2.x.baseVal.getItem(3).value is 1000
PASS text2.x.baseVal.getItem(4).value is 900
PASS text2.x.baseVal.getItem(5).value is 1000
-PASS text2.x.baseVal.getItem(6) threw exception IndexSizeError: Index or size was negative, or greater than the allowed value..
+PASS text2.x.baseVal.getItem(6) threw exception IndexSizeError: Failed to execute 'getItem' on 'SVGLengthList': The index provided (6) is greater than or equal to the maximum bound (6)..
The test passes if you only see 'PASS' messages, and all three text elements on top look the same