Add dash unit tests

tests/unit/vector.spec.js

@@ -0,0 +1,115 @@
+import PDFDocument from '../../lib/document';
+import { logData } from './helpers';
+
+describe('Vector Graphics', () => {
+  let document;
+
+  beforeEach(() => {
+    document = new PDFDocument({
+      info: { CreationDate: new Date(Date.UTC(2018, 1, 1)) },
+      compress: false
+    });
+  });
+
+  describe('dash', () => {
+    test('with numeric length argument', () => {
+      const docData = logData(document);
+      const vectorStream = new Buffer(
+        '1 0 0 -1 0 792 cm\n50 20 m\n[2 2] 0 d\nS\n',
+        'binary'
+      );
+
+      document
+        .moveTo(50, 20)
+        .dash(2)
+        .stroke();
+      document.end();
+
+      expect(docData).toContainChunk([
+        `5 0 obj`,
+        `<<
+/Length 38
+>>`,
+        `stream`,
+        vectorStream,
+        `\nendstream`,
+        `endobj`
+      ]);
+    });
+
+    test('with array length argument', () => {
+      const docData = logData(document);
+      const vectorStream = new Buffer(
+        '1 0 0 -1 0 792 cm\n50 20 m\n[1 2] 0 d\nS\n',
+        'binary'
+      );
+
+      document
+        .moveTo(50, 20)
+        .dash([1, 2])
+        .stroke();
+      document.end();
+
+      expect(docData).toContainChunk([
+        `5 0 obj`,
+        `<<
+/Length 38
+>>`,
+        `stream`,
+        vectorStream,
+        `\nendstream`,
+        `endobj`
+      ]);
+    });
+
+    test('with space option', () => {
+      const docData = logData(document);
+      const vectorStream = new Buffer(
+        '1 0 0 -1 0 792 cm\n50 20 m\n[2 10] 0 d\nS\n',
+        'binary'
+      );
+
+      document
+        .moveTo(50, 20)
+        .dash(2, { space: 10 })
+        .stroke();
+      document.end();
+
+      expect(docData).toContainChunk([
+        `5 0 obj`,
+        `<<
+/Length 39
+>>`,
+        `stream`,
+        vectorStream,
+        `\nendstream`,
+        `endobj`
+      ]);
+    });
+
+    test('with phase option', () => {
+      const docData = logData(document);
+      const vectorStream = new Buffer(
+        '1 0 0 -1 0 792 cm\n50 20 m\n[2 2] 8 d\nS\n',
+        'binary'
+      );
+
+      document
+        .moveTo(50, 20)
+        .dash(2, { phase: 8 })
+        .stroke();
+      document.end();
+
+      expect(docData).toContainChunk([
+        `5 0 obj`,
+        `<<
+/Length 38
+>>`,
+        `stream`,
+        vectorStream,
+        `\nendstream`,
+        `endobj`
+      ]);
+    });
+  });
+});