explain jest-snapshot double json encoding

avajs · Jan 30, 2017 · 2fa8da9 · 2fa8da9
1 parent 9a27d34
commit 2fa8da9
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/assert.js b/lib/assert.js
@@ -181,7 +181,8 @@ x._snapshot = function (tree, optionalMessage, match, snapshotStateGetter) {
 	let expected;
 
 	if (result.expected) {
-		// JSON in a snapshot is surrounded with `"`
+		// JSON in a snapshot is surrounded with `"`, because jest-snapshot
+		// serializes snapshot values too, so it ends up double JSON encoded
 		expected = JSON.parse(result.expected.slice(1).slice(0, -1));
 		// Define a `$$typeof` symbol, so that pretty-format detects it as React tree
 		if (expected.jsx) {