Turns out there is a test for this - test_basic_sin.py; this change was causing the test to fail. I have updated the reference tex file and removed the tests that I added since they aren't necessary.

Author: fsgeek

test/test_basic_sin_reference.tex

@@ -23,7 +23,7 @@
 ytick style={color=white!33.33333333333333!black}
 ]
 \addplot [semithick, color0, mark=*, mark size=3, mark options={solid}]
-table {%
+table [row sep=\\] {%
 0 0\\
 0.1 0.587785252292473\\
 0.2 0.951056516295154\\
@@ -47,7 +47,7 @@
 };
 \addlegendentry{sin}
 \addplot [very thick, color1, opacity=0.3, mark=*, mark size=3, mark options={solid}]
-table {%
+table [row sep=\\] {%
 0 1\\
 0.1 0.809016994374947\\
 0.2 0.309016994374947\\