Use table-driven tests for specific parsers

spec/runtime/node_position_spec.cc

@@ -0,0 +1,46 @@
+#include "runtime_spec_helper.h"
+
+extern "C" ts_parser ts_parser_json();
+
+START_TEST
+
+describe("tracking the positions of AST nodes", []() {
+    ts_document *doc;
+
+    before_each([&]() {
+        doc = ts_document_make();
+        ts_document_set_parser(doc, ts_parser_json());
+    });
+
+    after_each([&]() {
+        ts_document_free(doc);
+    });
+
+    it("records the widths and offsets of nodes", [&]() {
+        ts_document_set_input_string(doc, "  [12, 5]");
+        const ts_tree *tree = ts_document_tree(doc);
+
+        // TODO - make this better
+        const ts_tree *array = ts_tree_children(tree, NULL)[0];
+        const ts_tree *number1 = ts_tree_children(ts_tree_children(array, NULL)[1], NULL)[0];
+        const ts_tree *number2 = ts_tree_children(ts_tree_children(ts_tree_children(array, NULL)[2], NULL)[1], NULL)[0];
+
+        AssertThat(ts_document_symbol_name(doc, array), Equals("array"));
+        AssertThat(ts_document_symbol_name(doc, number1), Equals("number"));
+        AssertThat(ts_document_symbol_name(doc, number2), Equals("number"));
+
+        AssertThat(number1->offset, Equals<size_t>(0));
+        AssertThat(number1->size, Equals<size_t>(2));
+
+        AssertThat(number2->offset, Equals<size_t>(1));
+        AssertThat(number2->size, Equals<size_t>(1));
+
+        AssertThat(array->offset, Equals<size_t>(2));
+        AssertThat(array->size, Equals<size_t>(7));
+
+        AssertThat(tree->offset, Equals<size_t>(2));
+        AssertThat(tree->size, Equals<size_t>(7));
+    });
+});
+
+END_TEST