refactor(all): add test file

data/reports/scatter/six_traces.csv

-x1,y1,y2,y3
-1,2,5.5,11
-2,3,3,9
-3,4,5.5,7
-4,5,8,5
-5,6,6,3
-6,7,3,1
-7,8,8,3
-8,9,5,5
-9,10,6,3
-10,11,5.5,1
-10,9,4.75,-1
-9,8,5,1
-8,7,4,3
-7,6,7,1
-6,5,2,-0.5
-5,4,4,1
-4,3,7,3
-3,2,4.4,5
-2,1,2,7
-1,0,4.5,9
+x1,y1,y2,y3,x2,y4
+1,2,5.5,11,1,1
+2,3,3,9,2,2
+3,4,5.5,7,3,3
+4,5,8,5,4,4
+5,6,6,3,5,5
+6,7,3,1,6,6
+7,8,8,3,7,7
+8,9,5,5,8,8
+9,10,6,3,9,9
+10,11,5.5,1,10,10
+10,9,4.75,-1,,
+9,8,5,1,,
+8,7,4,3,,
+7,6,7,1,,
+6,5,2,-0.5,,
+5,4,4,1,,
+4,3,7,3,,
+3,2,4.4,5,,
+2,1,2,7,,
+1,0,4.5,9,,
\ No newline at end of file