Replaced tests with jest

test/build-type-graph.test.js

@@ -0,0 +1,78 @@
+const buildTypeGraph = require('../source/build-type-graph');
+
+const emptySchema = '';
+
+const simpleSchema = `
+
+scalar Date
+
+type Book {
+	unique String title
+	Date published
+	Float rating
+}
+
+type Author {
+	unique String name
+	Book books
+}
+
+`;
+
+const missingDateSchema = `
+
+type Book {
+	unique String title
+	Date published
+	Float rating
+}
+
+type Author {
+	unique String name
+	Book books
+}
+
+`;
+
+const outOfOrderSchema = `
+
+type Book {
+	unique String title
+	Date published
+	Float rating
+}
+
+type Author {
+	unique String name
+	Book books
+}
+
+scalar Date
+
+`;
+
+//parse the input, validating the structure as you go
+test('buildTypeGraph - build an empty type graph', () => {
+	const graph = buildTypeGraph(emptySchema, { debug: false });
+
+	expect(Object.keys(graph).length).toEqual(4); //4 for the 4 base types
+});
+
+test('buildTypeGraph - build a simple type graph', () => {
+	const graph = buildTypeGraph(simpleSchema, { debug: false });
+
+	expect(Object.keys(graph).length).toEqual(7); //4 for the 4 base types + 3 for Date, Book, Author
+});
+
+test('buildTypeGraph - build an invalid type graph (missing Date)', () => {
+	const f = () => buildTypeGraph(missingDateSchema, { debug: false });
+
+	expect(f).toThrow("Unexpected value found as type field ('Date' is undefined)");
+});
+
+test('buildTypeGraph - build an invalid type graph (out of order Date)', () => {
+	const f = () => buildTypeGraph(outOfOrderSchema, { debug: false });
+
+	expect(f).toThrow("Unexpected value found as type field ('Date' is undefined)");
+});
+