Example unit test for the article "Count with JsonPath"

json-path/src/main/resources/online_store.json

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+{
+	"items": {
+		"book": [
+			{
+				"author": "Arthur Conan Doyle",
+				"title": "Sherlock Holmes",
+				"price": 8.99
+			},
+			{
+				"author": "J. R. R. Tolkien",
+				"title": "The Lord of the Rings",
+				"isbn": "0-395-19395-8",
+				"price": 22.99
+			}
+		],
+		"bicycle": {
+			"color": "red",
+			"price": 19.95
+		}
+	}
+}

json-path/src/test/java/com/baeldung/jsonpath/introduction/JsonPathUnitTest.java

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+package com.baeldung.jsonpath.introduction;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.Map;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.jayway.jsonpath.JsonPath;
+
+import net.minidev.json.JSONArray;
+
+public class JsonPathUnitTest {
+
+    private static String json;
+    private static File jsonFile = new File("src/main/resources/online_store.json");
+
+    private static String readFile(File file, Charset charset) throws IOException {
+        return new String(Files.readAllBytes(file.toPath()), charset);
+    }
+
+    @BeforeClass
+    public static void init() throws IOException {
+        json = readFile(jsonFile, StandardCharsets.UTF_8);
+    }
+
+    @Test
+    public void shouldMatchCountOfObjects() {
+        Map<String, String> objectMap = JsonPath.read(json, "$");
+        assertEquals(1, objectMap.keySet()
+            .size());
+    }
+
+    @Test
+    public void shouldMatchCountOfArrays() {
+        JSONArray jsonArray = JsonPath.read(json, "$.items.book[*]");
+        assertEquals(2, jsonArray.size());
+    }
+
+}