Add dummy data

JabMapTestData/map_test.bib

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+% Encoding: UTF-8
+
+@Book{burdea2003virtual,
+  author    = {Burdea, Grigore C and Coiffet, Philippe},
+  publisher = {John Wiley \& Sons},
+  title     = {Virtual reality technology},
+  year      = {2003},
+  comment   = {Test commentius},
+}
+
+@Book{heim1994metaphysics,
+  author    = {Heim, Michael},
+  publisher = {Oxford University Press},
+  title     = {The metaphysics of virtual reality},
+  year      = {1994},
+}
+
+@Article{steuer1992defining,
+  author    = {Steuer, Jonathan},
+  journal   = {Journal of communication},
+  title     = {Defining virtual reality: Dimensions determining telepresence},
+  year      = {1992},
+  number    = {4},
+  pages     = {73--93},
+  volume    = {42},
+  publisher = {Wiley Online Library},
+}
+
+@MindMapNode{mindmapnode_1,
+  label		= {node 1},
+  bibentry = {steuer1992defining},
+  x_pos		= {0},
+  y_pos		= {0},
+}
+
+@MindMapNode{mindmapnode_2,
+  label		= {node 2},
+  x_pos		= {10},
+  y_pos		= {0},
+}
+
+@MindMapEdge{mindmapedge_from_1_to_2,
+  label		= {test edge},
+  direction	= {DEFAULT},
+}
+
+@Comment{jabref-meta: databaseType:bibtex;}