-{ { -1 0 0 } } [ test-segment-oint { 1 0 0 } vector-to-centre ] unit-test
-{ { 1 0 0 } } [ test-segment-oint { -1 0 0 } vector-to-centre ] unit-test
-{ { 0 -1 0 } } [ test-segment-oint { 0 1 0 } vector-to-centre ] unit-test
-{ { 0 1 0 } } [ test-segment-oint { 0 -1 0 } vector-to-centre ] unit-test
-{ { -1 0 0 } } [ test-segment-oint { 1 0 -1 } vector-to-centre ] unit-test
-{ { 1 0 0 } } [ test-segment-oint { -1 0 -1 } vector-to-centre ] unit-test
-{ { 0 -1 0 } } [ test-segment-oint { 0 1 -1 } vector-to-centre ] unit-test
-{ { 0 1 0 } } [ test-segment-oint { 0 -1 -1 } vector-to-centre ] unit-test
+{ { -1 0 0 } } [ test-segment-oint { 1 0 0 } vector-to-center ] unit-test
+{ { 1 0 0 } } [ test-segment-oint { -1 0 0 } vector-to-center ] unit-test
+{ { 0 -1 0 } } [ test-segment-oint { 0 1 0 } vector-to-center ] unit-test
+{ { 0 1 0 } } [ test-segment-oint { 0 -1 0 } vector-to-center ] unit-test
+{ { -1 0 0 } } [ test-segment-oint { 1 0 -1 } vector-to-center ] unit-test
+{ { 1 0 0 } } [ test-segment-oint { -1 0 -1 } vector-to-center ] unit-test
+{ { 0 -1 0 } } [ test-segment-oint { 0 1 -1 } vector-to-center ] unit-test
+{ { 0 1 0 } } [ test-segment-oint { 0 -1 -1 } vector-to-center ] unit-test