tests: Handle sed which append a trailing newline.

tests/example.expected

@@ -7,3 +7,4 @@ write to stderr 2<STDERR<write to stdout 2>STDERR>
 stderr ...
 <STDERR<more on stdout
 >STDERR>x<STDERR<
+EOF

tests/example_environment_empty.expected

@@ -7,3 +7,4 @@ more on stderr
 stderr ...
 more on stdout
 x
+EOF

tests/example_err.expected

@@ -9,3 +9,4 @@
 >STDERR>example_err: warning: message: Cannot allocate memory
 example_err: warning: message
 <STDERR<
+EOF

tests/example_error.expected

@@ -7,4 +7,4 @@ PROG<message>
 PROGfile:42: <message>
 PROG<message>: Cannot allocate memory
 PROGfile:42: <message>: Cannot allocate memory
-<STDERR<
+<STDERR<EOF

tests/example_exec.expected

@@ -123,3 +123,4 @@ environ[0] = |COLORED_STDERR_PRIVATE_FDS=2,|
 environ[1] = |TEST=55|
 
 Done.
+EOF

tests/example_noforce.sh.expected

@@ -1,3 +1,3 @@
 write to stdout
 write to stderr
-write to stdout without newlinewrite to stderr without newline
+write to stdout without newlinewrite to stderr without newlineEOF

tests/example_redirects.sh.expected

@@ -5,4 +5,4 @@
 write to stderr which gets redirected to stdout
 write to stdout 3
 >STDERR>another redirect to stderr
-<STDERR<
+<STDERR<EOF

tests/example_simple.sh.expected

@@ -1,3 +1,3 @@
 write to stdout
 >STDERR>write to stderr
-<STDERR<write to stdout without newline>STDERR>write to stderr without newline<STDERR<
+<STDERR<write to stdout without newline>STDERR>write to stderr without newline<STDERR<EOF

tests/example_stdio.expected

@@ -26,3 +26,4 @@ z
 >STDERR>fputs_unlocked()<STDERR<
 >STDERR>x<STDERR<
 >STDERR>y<STDERR<
+EOF

tests/example_vfork.expected

@@ -1,3 +1,4 @@
 >STDERR>Before vfork().
 After vfork().
 <STDERR<
+EOF

tests/lib.sh

@@ -99,6 +99,10 @@ run_test() {
         $valgrind_cmd "$@" "$testcase" > "$output" 2>&1
     )
 
+    # Some sed implementations (e.g. on FreeBSD 9.1) always append a trailing
+    # newline. Add "EOF" to detect if the real output had one.
+    echo EOF >> "$output"
+
     # Merge continuous regions of colored output. The exact calls don't matter
     # as long as the output is colored.
     sed 's/<STDERR<>STDERR>//g' < "$output" > "$output.tmp"