1# RUN: echo foo > %t.foo
2# RUN: echo bar > %t.bar
3
4# Check output pipe.
5# RUN: diff %t.foo %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s
6# RUN: diff -u %t.foo %t.bar | FileCheck %s && false || true
7
8# Check input pipe.
9# RUN: cat %t.foo | diff -u - %t.foo
10# RUN: cat %t.foo | diff -u %t.foo -
11# RUN: cat %t.bar | diff -u %t.foo - && false || true
12# RUN: cat %t.bar | diff -u - %t.foo && false || true
13
14# Check output and input pipes at the same time.
15# RUN: cat %t.foo | diff - %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s
16# RUN: cat %t.bar | diff -u %t.foo - | FileCheck %s && false || true
17
18# Fail so lit will print output.
19# RUN: false
20
21# CHECK:      @@
22# CHECK-NEXT: -foo
23# CHECK-NEXT: +bar
24
25# EMPTY-NOT: {{.}}
26