diff --git a/tests/testthat/test-expand.R b/tests/testthat/test-expand.R
new file mode 100644
index 00000000..1bfd8991
--- /dev/null
+++ b/tests/testthat/test-expand.R
@@ -0,0 +1,45 @@
+context("Default values for plot configuration expand and scales")
+
+# To prevent copy/paste, expressions are used in the sequel
+plotNames <- c("DDIRatio", "", "TimeProfile", "ObsVsPred", "ResVsPred", "Histogram", "PKRatio", "BoxWhisker", "Tornado")
+
+# Epression is "<plotname>plotConfiguration <- <PlotName>PlotConfiguration$new()"
+createPlotConfigurations <- parse(text = paste0(tolower(plotNames), "plotConfiguration <- ", plotNames, "PlotConfiguration$new()"))
+eval(createPlotConfigurations)
+
+# Epression is "expect_false(<plotname>plotConfiguration$defaultExpand)"
+# Use -1 to remove first element ie DDI Ratio from the evaluation
+checkExpandIsFalse <- parse(text = paste0("expect_false(", tolower(plotNames[-1]), "plotConfiguration$defaultExpand)"))
+
+test_that("Default expand is true for DDI ratio only", {
+  eval(checkExpandIsFalse)
+  expect_true(ddiratioplotConfiguration$defaultExpand)
+})
+
+
+test_that("Default x and y scales is log for ddi ratio", {
+  expect_equal(ddiratioplotConfiguration$defaultXScale, Scaling$log)
+  expect_equal(ddiratioplotConfiguration$defaultYScale, Scaling$log)
+})
+
+test_that("Default x scale is linear and y scale is log for pk ratio", {
+  expect_equal(pkratioplotConfiguration$defaultXScale, Scaling$lin)
+  expect_equal(pkratioplotConfiguration$defaultYScale, Scaling$log)
+})
+
+test_that("Default x scale is linear and y scale is discrete for tornado plot", {
+  expect_equal(tornadoplotConfiguration$defaultXScale, Scaling$lin)
+  expect_equal(tornadoplotConfiguration$defaultYScale, Scaling$discrete)
+})
+
+test_that("Default x scale is discrete and y scale is linear for box-whisker plot", {
+  expect_equal(boxwhiskerplotConfiguration$defaultXScale, Scaling$discrete)
+  expect_equal(boxwhiskerplotConfiguration$defaultYScale, Scaling$lin)
+})
+
+checkXScaleIsLinear <- parse(text = paste0("expect_equal(", tolower(plotNames[2:6]), "plotConfiguration$defaultXScale, Scaling$lin)"))
+checkYScaleIsLinear <- parse(text = paste0("expect_equal(", tolower(plotNames[2:6]), "plotConfiguration$defaultYScale, Scaling$lin)"))
+test_that("Default scales are linear for other plots", {
+  eval(checkXScaleIsLinear)
+  eval(checkYScaleIsLinear)
+})