Sample Rmd file to use for testing knitr with class options

test_class.Rmd

---
title: Background color
output: 
  html_document:
    keep_md: yes
---

You will need a development version of knitr to get this to work (for now).

```
# install.packages("devtools")
install_github("ijlyttle/knitr", ref = "option_class")
```

```{r}
a <- 2
```

```{css}
.badSource { background-color: red; }
.badOutput { background-color: orange; }
```

```{r mtcars}
library("magrittr")

mtcars %>%
  summary()
```

Putting in a second (meaningless) class in `class.output`, just to be sure that multiple classes work how I expect.

```{r cars, class.source="badSource", class.output=c("badOutput", "foo")}
summary(cars)
```