Cover extractSnippets() with basic tests.

test/evaluateSnippets.spec.js

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+const expect = require('unexpected');
+
+const evaluateSnippets = require('../lib/evaluateSnippets');
+
+describe('extractSnippets', () => {
+  it('should evaluate javascript snippets', async () => {
+    const snippets = [
+      {
+        lang: 'javascript',
+        flags: { evaluate: true },
+        index: 24,
+        code:
+          'throw new Error("foo\\n  at bar (/somewhere.js:1:2)\\n  at quux (/blah.js:3:4)\\n  at baz (/yadda.js:5:6)")'
+      },
+      {
+        lang: 'output',
+        flags: { cleanStackTrace: true, evaluate: true },
+        index: 198,
+        code:
+          'foo\n  at bar (/path/to/file.js:x:y)\n  at quux (/path/to/file.js:x:y)'
+      }
+    ];
+
+    await evaluateSnippets(snippets);
+
+    expect(snippets[0], 'to satisfy', {
+      htmlErrorMessage:
+        '<div style="font-family: monospace; white-space: nowrap"><div><span style="color: red; font-weight: bold">foo</span></div><div><span style="color: red; font-weight: bold">&nbsp;&nbsp;at&nbsp;bar&nbsp;(/somewhere.js:1:2)</span></div><div><span style="color: red; font-weight: bold">&nbsp;&nbsp;at&nbsp;quux&nbsp;(/blah.js:3:4)</span></div><div><span style="color: red; font-weight: bold">&nbsp;&nbsp;at&nbsp;baz&nbsp;(/yadda.js:5:6)</span></div></div>',
+      errorMessage:
+        'foo\n  at bar (/somewhere.js:1:2)\n  at quux (/blah.js:3:4)\n  at baz (/yadda.js:5:6)'
+    });
+  });
+
+  describe('with an aync snippet', () => {
+    it('should evaluate javascript snippets', async () => {
+      const snippets = [
+        {
+          lang: 'javascript',
+          flags: { async: true, evaluate: true },
+          index: 40,
+          code: "return Promise.reject(new Error('boom'));"
+        }
+      ];
+
+      await evaluateSnippets(snippets);
+
+      expect(snippets[0], 'to satisfy', {
+        htmlErrorMessage: '<div style="font-family: monospace; white-space: nowrap"><div><span style="color: red; font-weight: bold">boom</span></div></div>',
+        errorMessage: 'boom'
+      });
+    });
+
+    it('should record an error string if missing a return', async () => {
+      const snippets = [
+        {
+          lang: 'javascript',
+          flags: { async: true, evaluate: true },
+          index: 40,
+          code: "Promise.resolve();"
+        }
+      ];
+
+      await evaluateSnippets(snippets);
+
+      expect(snippets[0], 'to satisfy', {
+        htmlErrorMessage: '<div style="font-family: monospace; white-space: nowrap"><div><span style="color: red; font-weight: bold">Async&nbsp;code&nbsp;block&nbsp;did&nbsp;not&nbsp;return&nbsp;a&nbsp;promise&nbsp;or&nbsp;throw</span></div><div><span style="color: red; font-weight: bold">Promise.resolve();</span></div></div>',
+        errorMessage: 'Async code block did not return a promise or throw\nPromise.resolve();'
+      });
+    });
+  });
+});