[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, 22 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-strings/stdin.test b/llvm/test/tools/llvm-strings/stdin.test
new file mode 100644
index 00000000000..b8ccc12e52f
--- /dev/null
+++ b/llvm/test/tools/llvm-strings/stdin.test
@@ -0,0 +1,22 @@
+## Show that llvm-strings can handle stdin input properly.
+
+## Case 1: output with single string.
+RUN: echo -n "abcdefg" | llvm-strings - | FileCheck %s --check-prefix=CASE1 --implicit-check-not={{.}}
+CASE1: abcdefg
+
+## Case 2: output too short for string.
+RUN: echo -n "abc" | llvm-strings - | FileCheck %s --implicit-check-not={{.}} --allow-empty
+
+## Case 3: output with new line.
+RUN: echo -e "abcd\nefgh" | llvm-strings - | FileCheck %s --check-prefix=CASE3 --implicit-check-not={{.}}
+CASE3:      abcd
+CASE3-NEXT: efgh
+
+## Case 4: output containing unprintable characters.
+RUN: echo -e "abcd\x00ef\x1fghij\x7fklmn" | llvm-strings - | FileCheck %s --check-prefix=CASE4 --implicit-check-not={{.}} 
+CASE4:      abcd
+CASE4-NEXT: ghij
+CASE4-NEXT: klmn
+
+## Case 5: no file name specified is equivalent to explicitly requesting stdin.
+RUN: echo -n "abcdefg" | llvm-strings | FileCheck %s --check-prefix=CASE1 --implicit-check-not={{.}}