```
# Integration Test
require(ggplot2)
require(gridExtra)
require(testthat)
# Generate small data to test our function
set.seed(4)
X <- data.frame('X1' = rnorm(10))
y <- X$X1 + rnorm(10)
# EDA Function: This function is independent of LinearRegression() function and plot_karl()
summary <- EDA(X,y)
# Linear Regression Function
lm <- LinearRegression(X,y)
# Plot Linear Model Function: plot_karl() is dependent on the output from LinearRegression()
plots <- plot_karl(lm)
test_that("plot_karl(): returns various plots using the linear model object", {
# expected outputs:
expect_match(typeof(plots), "list") # Checks to see if the plotting type is correct
expect_equal(length(plots), 2) # Checks to see if the number of outputs is correct.
expect_false(plots$respect) # Respective to eachother the outputs.
})
```

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