diff --git a/tests/testthat/test-load.lcms.R b/tests/testthat/test-load.lcms.R
index 8bfae4a..0b026f9 100644
--- a/tests/testthat/test-load.lcms.R
+++ b/tests/testthat/test-load.lcms.R
@@ -1,23 +1,39 @@
+create_test_case <- function(filename, mz_length, rt_length, intensities_length) {
+  list(
+    filename = filename,
+    expected_type = "list",
+    expected_lengths = c(mz = mz_length, rt = rt_length, intensities = intensities_length),
+    expected_num_na = c(mz = 0, rt = 0, intensities = 0)
+  )
+}
+
 patrick::with_parameters_test_that(
-  "test load.lcms reads mzML file",
+  "test load.lcms reads different file types",
   {
     # Arrange: Set up test inputs
     testdata <- file.path("..", "testdata")
-    input_path <- file.path(testdata, filename)
+    input_path <- file.path(testdata, "input", filename)
 
     # Act: Execute the function with the test inputs
-    sut <- load.lcms(input_path)
+    data <- recetox.aplcms::load.lcms(input_path)
 
     # Assert: Verify the function output matches expected results
     # Check that the function returns an object of the expected type
-    testthat::expect_s3_class(sut, "tbl_df")
+    actual_type <- data
+    testthat::expect_type(actual_type, expected_type)
+    
+    # Check the lengths of the vectors in the list
+    actual_lengths <- lengths(data)
+    testthat::expect_equal(actual_lengths, expected_lengths)
+
+    # Check the number of NA values in each vector
+    actual_num_na <- sapply(data, function(x) sum(is.na(x)))
+    testthat::expect_equal(actual_num_na, expected_num_na)
   },
+  
   patrick::cases(
-    test_case_1 = list(
-      filename = c("mbr_test0_copy.mzml")
-    ),
-    test_case_2 = list(
-      filename = c("test0_copy.mzxml")
-    )
+    test_case_1 = create_test_case("RCX_06_shortened.mzML", 879476, 879476, 879476),
+    test_case_2 = create_test_case("test_file.mzXML", 9647575, 9647575, 9647575),
+    test_case_3 = create_test_case("alg3.mzdata", 543894, 543894, 543894)
   )
 )
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