Add pipe_consistency tests

tests/testthat/test-pipe-consistency-linter.R

@@ -0,0 +1,43 @@
+test_that("pipe_consistency skips allowed usage", {
+  expect_lint("1:3 %>% mean() %>% as.character()", NULL, pipe_consistency_linter())
+  expect_lint("1:3 |> mean() |> as.character()", NULL, pipe_consistency_linter())
+  # With no pipes
+  expect_lint("x <- 1:5", NULL, pipe_consistency_linter())
+  # Across multiple lines
+  expect_lint(
+    c("1:3 %>%", "mean() %>%", "as.character()"),
+    NULL,
+    pipe_consistency_linter()
+  )
+})
+
+test_that("pipe_consistency lints inconsistent usage", {
+  expected_msg <- rex::rex("Use consistent pipe operators (either all %>% or all |>).")
+  expect_lint(
+    "1:3 |> mean() %>% as.character()",
+    list(
+      list(message = expected_msg, line_number = 1L, column_number = 5L),
+      list(message = expected_msg, line_number = 1L, column_number = 15L)
+    ),
+    pipe_consistency_linter()
+  )
+
+  expect_lint(
+    "1:3 %>% mean() |> as.character()",
+    list(
+      list(message = expected_msg, line_number = 1L, column_number = 5L),
+      list(message = expected_msg, line_number = 1L, column_number = 16L)
+    ),
+    pipe_consistency_linter()
+  )
+
+  # Across lines
+  expect_lint(
+    c("1:3 %>%", "mean() |>", "as.character()"),
+    list(
+      list(message = expected_msg, line_number = 1L, column_number = 5L),
+      list(message = expected_msg, line_number = 2L, column_number = 8L)
+    ),
+    pipe_consistency_linter()
+  )
+})