In parser, read chunked input correctly

spec/runtime/parser_spec.cc

@@ -0,0 +1,36 @@
+#include "runtime_spec_helper.h"
+#include "helpers/spy_reader.h"
+
+extern ts_parse_config ts_parse_config_json;
+
+START_TEST
+
+describe("reading from an input", [&]() {
+    ts_document *doc;
+    
+    before_each([&]() {
+        doc = ts_document_make();
+        ts_document_set_parser(doc, ts_parse_config_json);
+    });
+    
+    after_each([&]() {
+        ts_document_free(doc);
+    });
+
+    it("reads the entire input", [&]() {
+        SpyReader reader("\"ok go do it!\"", 3);
+        ts_document_set_input(doc, reader.input);
+        
+        AssertThat(string(ts_document_string(doc)), Equals("(value (string))"));
+        AssertThat(reader.chunks_read, Equals(vector<string>({
+            "\"ok",
+            " go",
+            " do",
+            " it",
+            "!\"",
+            ""
+        })));
+    });
+});
+
+END_TEST