Use table-driven tests for specific parsers

spec/runtime/language_specs.cc

@@ -0,0 +1,46 @@
+#include "runtime_spec_helper.h"
+#include "helpers/read_test_entries.h"
+
+extern "C" ts_parser ts_parser_json();
+extern "C" ts_parser ts_parser_arithmetic();
+
+START_TEST
+
+describe("Languages", [&]() {
+    ts_document *doc;
+
+    before_each([&]() {
+        doc = ts_document_make();
+    });
+
+    after_each([&]() {
+        ts_document_free(doc);
+    });
+
+    auto run_tests_for_language = [&](string language) {
+        for (auto &entry : test_entries_for_language(language)) {
+            it(entry.description.c_str(), [&]() {
+                ts_document_set_input_string(doc, entry.input.c_str());
+                AssertThat(ts_document_string(doc), Equals(entry.tree_string.c_str()));
+            });
+        }
+    };
+
+    describe("json", [&]() {
+        before_each([&]() {
+            ts_document_set_parser(doc, ts_parser_json());
+        });
+
+        run_tests_for_language("json");
+    });
+
+    describe("arithmetic", [&]() {
+        before_each([&]() {
+            ts_document_set_parser(doc, ts_parser_arithmetic());
+        });
+
+        run_tests_for_language("arithmetic");
+    });
+});
+
+END_TEST