[no-relnote] Add failing libcuda locate test

Signed-off-by: Evan Lezar <elezar@nvidia.com>

internal/lookup/ldcache_test.go

@@ -0,0 +1,59 @@
+package lookup
+
+import (
+	"path/filepath"
+	"testing"
+
+	testlog "github.com/sirupsen/logrus/hooks/test"
+	"github.com/stretchr/testify/require"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/test"
+)
+
+func TestLDCacheLookup(t *testing.T) {
+	logger, _ := testlog.NewNullLogger()
+
+	moduleRoot, err := test.GetModuleRoot()
+	require.NoError(t, err)
+
+	testCases := []struct {
+		rootFs        string
+		inputs        []string
+		expected      string
+		expectedError error
+	}{
+		{
+			rootFs:        "rootfs-empty",
+			inputs:        []string{"libcuda.so.1", "libcuda.so.*", "libcuda.so.*.*", "libcuda.so.999.88.77"},
+			expectedError: ErrNotFound,
+		},
+		{
+			rootFs:   "rootfs-1",
+			inputs:   []string{"libcuda.so.1", "libcuda.so.*", "libcuda.so.*.*", "libcuda.so.999.88.77"},
+			expected: "/lib/x86_64-linux-gnu/libcuda.so.999.88.77",
+		},
+		{
+			rootFs:   "rootfs-2",
+			inputs:   []string{"libcuda.so.1", "libcuda.so.*", "libcuda.so.*.*", "libcuda.so.999.88.77"},
+			expected: "/var/lib/nvidia/lib64/libcuda.so.999.88.77",
+		},
+	}
+
+	for _, tc := range testCases {
+		for _, input := range tc.inputs {
+			t.Run(tc.rootFs+input, func(t *testing.T) {
+				rootfs := filepath.Join(moduleRoot, "testdata", "lookup", tc.rootFs)
+				l := newLdcacheLocator(
+					WithLogger(logger),
+					WithRoot(rootfs),
+				)
+
+				candidates, err := l.Locate(input)
+				require.ErrorIs(t, err, tc.expectedError)
+				if tc.expectedError == nil {
+					require.Equal(t, []string{filepath.Join(rootfs, tc.expected)}, candidates)
+				}
+			})
+		}
+	}
+}