correct broken testcase

correct broken testcase

Summary:
Turns out that phabricator and arc unit do not actually run
tests in our internal repo and this one had a bunch of syntax errors.

doh

No test cases were changed, just fixing syntax.

Test Plan:
- fbconfig folly/test

- fbmake runtests

- saw all ok

- _bin/folly/test/json_test

[==========] Running 10 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 10 tests from Json
[ RUN      ] Json.Unicode
[       OK ] Json.Unicode (0 ms)
[ RUN      ] Json.Parse
[       OK ] Json.Parse (1 ms)
[ RUN      ] Json.JavascriptSafe
[       OK ] Json.JavascriptSafe (0 ms)
[ RUN      ] Json.Produce
[       OK ] Json.Produce (0 ms)
[ RUN      ] Json.JsonEscape
[       OK ] Json.JsonEscape (0 ms)
[ RUN      ] Json.JsonNonAsciiEncoding
[       OK ] Json.JsonNonAsciiEncoding (0 ms)
[ RUN      ] Json.UTF8Retention
WARNING: Logging before InitGoogleLogging() is written to STDERR
I0528 11:29:43.879976 17977 JsonTest.cpp:257] input: ♥ => json: "♥"
I0528 11:29:43.880077 17977 JsonTest.cpp:259] output: ♥ => json: "♥"
[       OK ] Json.UTF8Retention (1 ms)
[ RUN      ] Json.UTF8EncodeNonAsciiRetention
I0528 11:29:43.880122 17977 JsonTest.cpp:284] input: ♥ => json: "\u2665"
I0528 11:29:43.880131 17977 JsonTest.cpp:286] output: ♥ => json: "\u2665"
[       OK ] Json.UTF8EncodeNonAsciiRetention (0 ms)
[ RUN      ] Json.UTF8Validation
[       OK ] Json.UTF8Validation (0 ms)
[ RUN      ] Json.ParseNonStringKeys
[       OK ] Json.ParseNonStringKeys (0 ms)
[----------] 10 tests from Json (2 ms total)

[----------] Global test environment tear-down
[==========] 10 tests from 1 test case ran. (2 ms total)
[  PASSED  ] 10 tests.

Reviewed By: delong.j@fb.com

FB internal diff: D826413

Blame Revision: D805218