feat(vs-export): add test.vs file for tests

closes #93

Author: JulienChampagnol

tests/data/test.vs

@@ -0,0 +1,45 @@
+GOCAD VSet 1 
+HEADER {
+name: points
+}
+GOCAD_ORIGINAL_COORDINATE_SYSTEM
+NAME from_column
+PROJECTION Unknown
+DATUM Unknown
+AXIS_NAME U V W
+AXIS_UNIT m m m
+ZPOSITIVE Elevation
+END_ORIGINAL_COORDINATE_SYSTEM
+GEOLOGICAL_FEATURE Top_S1
+PROPERTIES normal
+PROP_LEGAL_RANGES **none**  **none** 
+NO_DATA_VALUES -99999 
+PROPERTY_CLASSES vector3d
+PROPERTY_KINDS Length
+PROPERTY_SUBCLASSES LINEARFUNCTION Float 1  0 
+ESIZES 3 
+UNITS m
+PROPERTY_CLASS_HEADER X {
+kind: X
+unit: m
+}
+PROPERTY_CLASS_HEADER Y {
+kind: Y
+unit: m
+}
+PROPERTY_CLASS_HEADER Z {
+kind: Z
+unit: m
+is_z: on
+}
+PROPERTY_CLASS_HEADER vector3d {
+kind: Length
+unit: m
+}
+PVRTX 1 526771.3388671875 4845393.0419921875 216.72999572753906 0 0 0 
+PVRTX 2 526798.7607421875 4845580.1118164062 217.63999938964844 0 0 0 
+PVRTX 3 526798.88720703125 4845548.6440429688 214.69000244140625 0 0 0 
+PVRTX 4 526760.10107421875 4845518.87109375 219.10000610351562 0 0 0 
+PVRTX 5 526765.60107421875 4845485.5732421875 219.77000427246094 0 0 0 
+PVRTX 6 526725.5615234375 4845433.5830078125 221.00999450683594 0 0 0 
+END