fix: single files will not cause IO error (#194)

Running `dua <filename>` will once again provide size information
about that filename.

2 files changed, 7 insertions, 0 deletions

diff --git a/tests/snapshots/success-single-file b/tests/snapshots/success-single-file
new file mode 100644
index 0000000..8321cbf
--- /dev/null
+++ b/tests/snapshots/success-single-file
@@ -0,0 +1 @@
+   4.10 KB a
\ No newline at end of file
diff --git a/tests/stateless-journey.sh b/tests/stateless-journey.sh
index 37a32c2..2557f3a 100755
--- a/tests/stateless-journey.sh
+++ b/tests/stateless-journey.sh
@@ -31,6 +31,12 @@ WITH_FAILURE=1
               expect_run ${SUCCESSFULLY} "$exe" aggregate
             }
           )
+          (with "a single file argument"
+            it "produces a human-readable (metric) size display of that file" && {
+              WITH_SNAPSHOT="$snapshot/success-single-file" \
+              expect_run ${SUCCESSFULLY} "$exe" aggregate a
+            }
+          )
           (with "sorting disabled"
             it "produces a human-readable (metric) aggregate of everything within the current directory, alphabetically sorted, with total" && {
               WITH_SNAPSHOT="$snapshot/success-no-arguments-no-sort" \