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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.test.json;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Joiner;
import com.yahoo.test.JunitCompat;
import java.io.UncheckedIOException;
/**
* @author Vegard Sjonfjell
*/
public class JsonTestHelper {
private static final ObjectMapper mapper = new ObjectMapper();
/**
* Returns a normalized JSON String.
*
* <ol>
* <li>A JSON string with each object's names in sorted order.</li>
* <li>Two JSONs are equal iff their normalized JSON strings are equal.*</li>
* <li>The normalized JSON is (by default) an indented multi-line string to facilitate
* readability and line-based diff tools.</li>
* <li>The normalized string does not end with a newline (\n).</li>
* </ol>
*
* <p>*) No effort is done to normalize decimals and may cause false non-equality,
* e.g. 1.2e1 is not equal to 12. This may be fixed at a later time if needed.</p>
*/
public static String normalize(String json) {
JsonNode jsonNode;
try {
jsonNode = mapper.readTree(json);
} catch (JsonProcessingException e) {
throw new IllegalArgumentException("Invalid JSON", e);
}
return JsonNodeFormatter.toNormalizedJson(jsonNode, false);
}
/**
* Convenience method to input JSON without escaping double quotes and newlines
* Each parameter represents a line of JSON encoded data
* The lines are joined with newline and single quotes are replaced with double quotes
*/
public static String inputJson(String... lines) {
return Joiner.on("\n").join(lines).replaceAll("'", "\"");
}
/** Structurally compare two JSON encoded strings */
public static void assertJsonEquals(String inputJson, String expectedJson) {
try {
JsonNode expected = mapper.readTree(expectedJson);
JsonNode actual = mapper.readTree(inputJson);
JunitCompat.assertEquals(expected, actual);
} catch (JsonProcessingException e) {
throw new RuntimeException("Exception when comparing json strings." , e);
}
}
/** Structurally compare a {@link JsonNode} and a JSON string. */
public static void assertJsonEquals(JsonNode left, String rightJson) {
try {
String leftJson = mapper.writeValueAsString(left);
assertJsonEquals(leftJson, rightJson);
} catch (JsonProcessingException e) {
throw new UncheckedIOException(e);
}
}
/** Structurally compare two {@link JsonNode}s. */
public static void assertJsonEquals(JsonNode left, JsonNode right) {
try {
String leftJson = mapper.writeValueAsString(left);
String rightJson = mapper.writeValueAsString(right);
assertJsonEquals(leftJson, rightJson);
} catch (JsonProcessingException e) {
throw new UncheckedIOException(e);
}
}
}
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