Remove punctuation in test-layer.R that was failing

Author: clairemcwhite

tests/testthat/test-layer.r

@@ -42,15 +42,15 @@ test_that("function aesthetics are wrapped with stat()", {
   df <- data_frame(x = 1:10)
   expect_error(
     ggplot_build(ggplot(df, aes(density)) + geom_tile(stat = "density")),
-    "Aesthetics must be valid data columns:"
+    "Aesthetics must be valid data columns"
   )
 })
 
 test_that("computed stats are in appropriate layer", {
   df <- data_frame(x = 1:10)
   expect_error(
     ggplot_build(ggplot(df, aes(x = x, stat(density))) + geom_tile(stat = "density") + geom_point()),
-    "Aesthetics must be valid computed stats:"
+    "Aesthetics must be valid computed stats"
   )
 })