Avoid usethis::use_news_md() in test

It seems that the temporary package created in the test causes
usethis to infer the incorrect project name sometimes which caused
a the test to be flaky.

tests/testthat/test-show-news.R

@@ -2,7 +2,10 @@ test_that("can read NEWS.md in root directory", {
   skip_on_cran()
 
   pkg <- local_package_create()
-  suppressMessages(usethis::with_project(pkg, use_news_md()))
+  write(
+    "# test (development version)\n\n* Initial CRAN submission.",
+    path(pkg, "NEWS.md")
+  )
 
   expect_no_error(show_news(pkg))
 })
@@ -13,14 +16,17 @@ test_that("can read NEWS.Rd in inst directory", {
   pkg <- local_package_create()
 
   dir_create(pkg, "inst")
-  write("\\name{NEWS}
+  write(
+    "\\name{NEWS}
 \\title{News for Package 'test'}
 
 \\section{CHANGES IN test VERSION 0.0.1}{
   \\itemize{
     \\item First version
   }
-}", path(pkg, "inst", "NEWS.Rd"))
+}",
+    path(pkg, "inst", "NEWS.Rd")
+  )
 
   expect_no_error(show_news(pkg))
 })