Improve printed output for failing tests

Point the user to the ${test_name}/last_output file in the event of a failure.
Improve the output when a test fails to be more readable.

tests/test.sh

@@ -34,7 +34,8 @@ test_bin() {
   bundle exec metadata-json-lint $* metadata.json >last_output 2>&1
   RESULT=$?
   if [ $RESULT -ne $expect ]; then
-    fail "Failing Test (unexpected exit code) '${name}' (bin)"
+    fail "Failing Test '${name}' (unexpected exit code '${RESULT}' instead of '${expect}') (bin)"
+    echo "    Note: you can examine '${name}/last_output' for any output"
   else
     # If the test is not expected to succeed then it should match an expected output
     if [ $expect -eq $SUCCESS ]; then
@@ -44,13 +45,14 @@ test_bin() {
         if grep --quiet "`cat expected`" last_output; then
           echo "Successful Test '${name}' (bin)"
         else
-          fail "Failing Test (did not get expected output) '${name}' (bin)"
-          echo "Expected: '`cat expected`'"
-          echo "Actual: '`cat last_output`'"
+          fail "Failing Test '${name}' (did not get expected output) (bin)"
+          echo "    Comparing '${name}/expected' with '${name}/last_output':"
+          echo "        Expected: '`cat expected`'"
+          echo "        Actual: '`cat last_output`'"
         fi
       else
-        fail "Failing Test (expected output file ${name}/expected is missing) '${name}' (bin)"
-        echo "Actual output that needs tested: '`cat last_output`'"
+        fail "Failing Test '${name}' (expected output file ${name}/expected is missing) (bin)"
+        echo "    Actual output that needs tested ('${name}/last_output'): '`cat last_output`'"
       fi
     fi
   fi