diff --git a/lib/spack/spack/test/cmd/info.py b/lib/spack/spack/test/cmd/info.py
index e3d7b383a5e..a0ea57b03e4 100644
--- a/lib/spack/spack/test/cmd/info.py
+++ b/lib/spack/spack/test/cmd/info.py
@@ -57,9 +57,9 @@ def test_info_noversion(mock_packages, print_buffer):
 
 
 @pytest.mark.parametrize(
-    "pkg_query,expected", [("zlib", "False"), ("gcc", "True (version, variants)")]
+    "pkg_query,expected", [("zlib", "False"), ("find-externals1", "True (version)")]
 )
-def test_is_externally_detectable(pkg_query, expected, parser, print_buffer):
+def test_is_externally_detectable(mock_packages, pkg_query, expected, parser, print_buffer):
     args = parser.parse_args(["--detectable", pkg_query])
     spack.cmd.info.info(parser, args)
 
diff --git a/var/spack/repos/builtin.mock/packages/find-externals1/package.py b/var/spack/repos/builtin.mock/packages/find-externals1/package.py
index 2a82fad9b55..07d16a8f221 100644
--- a/var/spack/repos/builtin.mock/packages/find-externals1/package.py
+++ b/var/spack/repos/builtin.mock/packages/find-externals1/package.py
@@ -16,6 +16,10 @@ class FindExternals1(AutotoolsPackage):
 
     version("1.0", md5="abcdef1234567890abcdef1234567890")
 
+    @classmethod
+    def determine_version(cls, exe):
+        return "1.0"
+
     @classmethod
     def determine_spec_details(cls, prefix, exes_in_prefix):
         exe_to_path = dict((os.path.basename(p), p) for p in exes_in_prefix)