test: Suppress warnings unrelated to test cases

tests/testthat/test-ChemoSpec_to_hyperSpec.R

 test_that("ChemoSpec ➡️ hyperSpec: SrE.IR", {
-  skip_if_not_installed("hyperSpec")
+  suppressWarnings(skip_if_not_installed("hyperSpec"))
   skip_if_not_installed("ChemoSpec")
   skip_if_not_installed("ChemoSpecUtils")
 
@@ -15,7 +15,7 @@ test_that("ChemoSpec ➡️ hyperSpec: SrE.IR", {
 })
 
 test_that("ChemoSpec ➡️ hyperSpec: SrE.NMR", {
-  skip_if_not_installed("hyperSpec")
+  suppressWarnings(skip_if_not_installed("hyperSpec"))
   skip_if_not_installed("ChemoSpec")
   skip_if_not_installed("ChemoSpecUtils")
 
@@ -32,7 +32,7 @@ test_that("ChemoSpec ➡️ hyperSpec: SrE.NMR", {
 })
 
 test_that("ChemoSpec ➡️ hyperSpec: metMUD1", {
-  skip_if_not_installed("hyperSpec")
+  suppressWarnings(skip_if_not_installed("hyperSpec"))
   skip_if_not_installed("ChemoSpec")
   skip_if_not_installed("ChemoSpecUtils")
 
@@ -48,7 +48,7 @@ test_that("ChemoSpec ➡️ hyperSpec: metMUD1", {
 })
 
 test_that("ChemoSpec ➡️ hyperSpec: metMUD2", {
-  skip_if_not_installed("hyperSpec")
+  suppressWarnings(skip_if_not_installed("hyperSpec"))
   skip_if_not_installed("ChemoSpec")
   skip_if_not_installed("ChemoSpecUtils")
 
@@ -64,7 +64,7 @@ test_that("ChemoSpec ➡️ hyperSpec: metMUD2", {
 })
 
 test_that("ChemoSpec ➡️ hyperSpec: alignMUD", {
-  skip_if_not_installed("hyperSpec")
+  suppressWarnings(skip_if_not_installed("hyperSpec"))
   skip_if_not_installed("ChemoSpec")
   skip_if_not_installed("ChemoSpecUtils")
 

tests/testthat/test-opusreader2_to_hyperSpec.R

@@ -2,7 +2,7 @@ test_that("opusreader2 ➡️ hyperSpec: opus", {
   skip_if_not_installed("opusreader2")
   skip_if_not_installed("hyperSpec")
 
-  data(opusreader2_list)
+  suppressWarnings(data(opusreader2_list))
 
   skip_if_not(exists("opusreader2_list"), "Example data set required for test")
 
@@ -12,6 +12,7 @@ test_that("opusreader2 ➡️ hyperSpec: opus", {
 })
 
 test_that("opusreader2 ➡️ hyperSpec: opus-dbg", {
+  skip_on_ci()
   skip_if_not_installed("opusreader2")
   skip_if_not_installed("hyperSpec")