Added tests

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "test/shunit2"]
+	path = test/shunit2
+	url = https://github.com/kward/shunit2

package.json

@@ -4,7 +4,7 @@
   "description": "Command-Line Interface for the jsonpath-plus library",
   "main": "bin/jpp",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "test/jpp.test.sh"
   },
   "author": "John Scott",
   "license": "ISC",

test/jpp.test.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+test="$(dirname $0)"
+jpp="$test/../bin/jpp"
+
+testBasic() {
+  result=$($jpp "$test/openapi.json" '$'|wc -l)
+  assertEquals $result 1
+}
+
+testPretty() {
+  count=$(cat $test/openapi.json|wc -l)
+  result=$($jpp --pretty "$test/openapi.json" '$'|wc -l)
+  assertEquals $result $((count +2))
+}
+
+testSeparate() {
+  result=$($jpp --separate --jsonpath '$.paths[?(@.get && @.get.parameters)]~' $test/openapi.json|wc -l)
+
+  assertEquals $result 7
+}
+
+# Load shUnit2.
+. $test/shunit2/shunit2