[llvm-strings] Improve testing of llvm-strings

This patch tidies up the llvm-strings testing by:

1. Adding comments to every test.
2. Getting rid of canned input files, and having the tests generate
   them on the fly (this makes the tests self-contained).
3. Adding missing test coverage.
4. Renaming some tests that weren't clear as to their purpose.
5. Adding extra checking of various cases, formatting etc.
6. Removing a test that didn't seem to have any useful purpose for
   testing llvm-strings.

Reviewed by: rupprecht, grimar, MaskRay

Differential Revision: https://reviews.llvm.org/D66015

llvm-svn: 368555

1 files changed, 10 insertions, 3 deletions

diff --git a/llvm/test/tools/llvm-strings/file-filename.test b/llvm/test/tools/llvm-strings/file-filename.test
index 26f3b4d334f..7284970a4cf 100644
--- a/llvm/test/tools/llvm-strings/file-filename.test
+++ b/llvm/test/tools/llvm-strings/file-filename.test
@@ -1,3 +1,10 @@
-RUN: llvm-strings -f %S/Inputs/abcd | FileCheck %s
-RUN: llvm-strings --print-file-name %S/Inputs/abcd | FileCheck %s --strict-whitespace
-CHECK: {{[\\/]}}abcd: abcd
+## Show that --print-file-name prints the name of the file before each line in
+## the output.
+
+RUN: echo abcd > %t
+RUN: echo efg >> %t
+RUN: echo hijk >> %t
+RUN: llvm-strings -f %t | FileCheck %s --strict-whitespace -DFILE=%t
+RUN: llvm-strings --print-file-name %t | FileCheck %s --strict-whitespace -DFILE=%t
+CHECK:      [[FILE]]: abcd
+CHECK-NEXT: [[FILE]]: hijk