Add tests for LaTeX alt text

tests/testit/test-hooks-latex.R

@@ -0,0 +1,17 @@
+library(testit)
+
+assert("alt text is included in LaTeX output", {
+  # no alt text
+  (hook_plot_tex('foo.pdf', list(fig.align = 'center', fig.show = 'asis')) %==%
+     '\n\n{\\centering \\includegraphics{foo} \n\n}\n\n')
+
+  # alt text
+  (hook_plot_tex('foo.pdf', list(fig.alt = 'Alt', fig.align = 'center',
+                                 fig.show = 'asis')) %==%
+     '\n\n{\\centering \\includegraphics[,alt={Alt}]{foo} \n\n}\n\n')
+
+  # with width
+  (hook_plot_tex('foo.pdf', list(fig.alt = 'Alt', fig.align = 'center',
+                                 fig.show = 'asis', out.width = '\\maxwidth')) %==%
+     '\n\n{\\centering \\includegraphics[width=\\maxwidth,alt={Alt}]{foo} \n\n}\n\n')
+})