diff --git a/tests/testthat/test-test_spectral.R b/tests/testthat/test-test_spectral.R
index e1ac8fe..37a08c0 100644
--- a/tests/testthat/test-test_spectral.R
+++ b/tests/testthat/test-test_spectral.R
@@ -16,13 +16,18 @@ test_that("calculate_cv works", {
 })
 
 test_that("extract_pixel_values works", {
- aoi_files <- list.files('../../inst/extdata/fishnet',
-    pattern = '_fishnet.shp$', full.names = TRUE)
- raster_files <- list.files('../../inst/extdata/multiband_image',
-    pattern = '.tif$', full.names = TRUE)
- pixelvalues <- extract_pixel_values(raster_files, aoi_files,
-    c('blue', 'green', 'red', 'red_edge', 'nir'))
- expect_true(dim(pixelvalues)[1]>20000)
- expect_true(mean(pixelvalues[,3])>0.05 & mean(pixelvalues[,3])<0.06)
+  aoi_files <- list.files(
+    system.file("extdata/fishnet", package = "saltbush"),
+    pattern = '_fishnet.shp$', full.names = TRUE
+  )
+  raster_files <- list.files(
+    system.file("extdata/multiband_image", package = "saltbush"),
+    pattern = '.tif$', full.names = TRUE
+  )
+  pixelvalues <- extract_pixel_values(
+    raster_files, aoi_files, c('blue', 'green', 'red', 'red_edge', 'nir')
+  )
+  expect_true(dim(pixelvalues)[1] > 20000)
+  expect_true(mean(pixelvalues[,3]) > 0.05 & mean(pixelvalues[,3]) < 0.06)
 })