tests/vmcheck: Display human-readable status on jq failure

So it's easier to debug.

This inlines the helper into the only function that uses it.

Closes: #1430
Approved by: jlebon

tests/common/libtest.sh

@@ -359,17 +359,6 @@ skip_one_with_asan () {
     fi
 }
 
-assert_status_file_jq() {
-    status_file=$1; shift
-    for expression in "$@"; do
-        if ! jq -e "${expression}" >/dev/null < $status_file; then
-            jq . < $status_file | sed -e 's/^/# /' >&2
-            echo 1>&2 "${expression} failed to match in $status_file"
-            exit 1
-        fi
-    done
-}
-
 get_obj_path() {
   repo=$1; shift
   csum=$1; shift

tests/common/libvm.sh

@@ -350,9 +350,19 @@ vm_assert_layered_pkg() {
   fi
 }
 
+# Takes a list of `jq` expressions, each of which should evaluate to a boolean,
+# and asserts that they are true.
 vm_assert_status_jq() {
     vm_rpmostree status --json > status.json
-    assert_status_file_jq status.json "$@"
+    vm_rpmostree status > status.txt
+    for expression in "$@"; do
+        if ! jq -e "${expression}" >/dev/null < status.json; then
+            jq . < status.json | sed -e 's/^/# /' >&2
+            echo 1>&2 "${expression} failed to match status.json"
+            cat status.txt
+            exit 1
+        fi
+    done
 }
 
 vm_pending_is_staged() {