-cat > "$expected_file" <<END
-TestSourceABCDE: ABCDE
-TestSourceExt: ${trace_dir}${dir_sep}aaa1, ${trace_dir}${dir_sep}aaa2, ${trace_dir}${dir_sep}aaa3
-TestSourceExt: ${trace_dir}${dir_sep}bbb1, ${trace_dir}${dir_sep}bbb2
-TestSourceExt: ${trace_dir}${dir_sep}ccc1
-TestSourceExt: ${trace_dir}${dir_sep}ccc2
-TestSourceExt: ${trace_dir}${dir_sep}ccc3
-TestSourceExt: ${trace_dir}${dir_sep}ccc4
-TestSourceSomeDir: ${trace_dir}${dir_sep}some-dir
-END
+# Check components and their inputs.
+bt_diff "$stdout_expected_file" "$stdout_actual_file"
+ok "$?" "expected components are instantiated with expected inputs"