tests: Simplify shell exit status negation;

* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-lint.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh: Use the shell '!' keyword to negate command exit status
in place of 'if ...; then false; else true; fi'

1 files changed, 3 insertions, 6 deletions

diff --git a/tests/guix-package-net.sh b/tests/guix-package-net.sh
index 3876701fa21..6d21c6cff6a 100644
--- a/tests/guix-package-net.sh
+++ b/tests/guix-package-net.sh
@@ -95,10 +95,8 @@ test "`guix package -p "$profile" -l | cut -f1 | grep guile | head -n1`" \
      = "  guile-bootstrap"
 
 # Exit with 1 when a generation does not exist.
-if guix package -p "$profile" --list-generations=42;
-then false; else true; fi
-if guix package -p "$profile" --switch-generation=99;
-then false; else true; fi
+! guix package -p "$profile" --list-generations=42
+! guix package -p "$profile" --switch-generation=99
 
 # Remove a package.
 guix package --bootstrap -p "$profile" -r "guile-bootstrap"
@@ -174,8 +172,7 @@ test -z "`guix package -p "$profile" -l 3`"
 rm "$profile"
 guix package --bootstrap -p "$profile" -i guile-bootstrap
 guix package --bootstrap -p "$profile_alt" -i gcc-bootstrap
-if guix package -p "$profile" --search-paths | grep LIBRARY_PATH
-then false; fi
+! guix package -p "$profile" --search-paths | grep LIBRARY_PATH
 guix package -p "$profile" -p "$profile_alt" --search-paths \
      | grep "LIBRARY_PATH.*$profile/lib.$profile_alt/lib"