fix: correct query parameter in AJAX call

The correct query parameter to get a file from GitHub API is `ref` but
we've been using `branch` this whole time. This has worked so far
because all the tests have been performed on a file
(`https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc`) that
has only one version in git history. Providing a `branch` parameter
instead of a `ref` parameter causes GitHub to assume no `ref` has been
specified and as such to return the latest version of that file on the
`master` branch, which coincidentally is the correct content of the
tested file (which ever only has one version).

This commit fixes that error and also updates all test files so that
they don't use the special case of files with only one version in git
history.

src/__fixtures__/no-ellipsis-comments/expected.md

@@ -3,10 +3,11 @@ This is a test of the plugin
 Should include language and range in code block:
 
 ```javascript
-{
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
 ```

src/__fixtures__/no-ellipsis-comments/input.md

@@ -2,4 +2,4 @@ This is a test of the plugin
 
 Should include language and range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc javascript 1,5-8,14 GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js javascript 1,2,27-31 GITHUB-EMBED

src/__fixtures__/simple-example/expected.md

@@ -3,54 +3,93 @@ This is a test of the plugin
 Should not include language or range in code block:
 
 ```
-{
-  "presets": [
-    [
-      "env", {
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-      }
-    ]
-  ],
-  "plugins": [
-  ]
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
+
+/**
+ * This method is like `_.sum` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the value to be summed.
+ * The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Math
+ * @param {Array} array The array to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+ *
+ * _.sumBy(objects, function(o) { return o.n; });
+ * // => 20
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sumBy(objects, 'n');
+ * // => 20
+ */
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
 
+export default sumBy;
+
 ```
 
 Should include language but not range in code block:
 
 ```javascript
-{
-  "presets": [
-    [
-      "env", {
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-      }
-    ]
-  ],
-  "plugins": [
-  ]
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
+
+/**
+ * This method is like `_.sum` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the value to be summed.
+ * The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Math
+ * @param {Array} array The array to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+ *
+ * _.sumBy(objects, function(o) { return o.n; });
+ * // => 20
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sumBy(objects, 'n');
+ * // => 20
+ */
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
 
+export default sumBy;
+
 ```
 
 Should include language and range in code block:
 
 ```javascript
-{
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
 // ...
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-        // ...
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
+// ...
 ```
 
 Should not transform this:

src/__fixtures__/simple-example/input.md

@@ -2,15 +2,15 @@ This is a test of the plugin
 
 Should not include language or range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js GITHUB-EMBED
 
 Should include language but not range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc javascript GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js javascript GITHUB-EMBED
 
 Should include language and range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc javascript 1,5-8,14 GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js javascript 1,2,27-31 GITHUB-EMBED
 
 Should not transform this:
 

src/__fixtures__/with-cache/expected.md

@@ -3,54 +3,93 @@ This is a test of the plugin
 Should not include language or range in code block:
 
 ```
-{
-  "presets": [
-    [
-      "env", {
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-      }
-    ]
-  ],
-  "plugins": [
-  ]
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
+
+/**
+ * This method is like `_.sum` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the value to be summed.
+ * The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Math
+ * @param {Array} array The array to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+ *
+ * _.sumBy(objects, function(o) { return o.n; });
+ * // => 20
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sumBy(objects, 'n');
+ * // => 20
+ */
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
 
+export default sumBy;
+
 ```
 
 Should include language but not range in code block:
 
 ```javascript
-{
-  "presets": [
-    [
-      "env", {
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-      }
-    ]
-  ],
-  "plugins": [
-  ]
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
+
+/**
+ * This method is like `_.sum` except that it accepts `iteratee` which is
+ * invoked for each element in `array` to generate the value to be summed.
+ * The iteratee is invoked with one argument: (value).
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Math
+ * @param {Array} array The array to iterate over.
+ * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
+ * @returns {number} Returns the sum.
+ * @example
+ *
+ * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
+ *
+ * _.sumBy(objects, function(o) { return o.n; });
+ * // => 20
+ *
+ * // The `_.property` iteratee shorthand.
+ * _.sumBy(objects, 'n');
+ * // => 20
+ */
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
 
+export default sumBy;
+
 ```
 
 Should include language and range in code block:
 
 ```javascript
-{
+import baseIteratee from './_baseIteratee.js';
+import baseSum from './_baseSum.js';
 // ...
-        "targets": {
-          "node": "current",
-        },
-        "spec": true
-        // ...
+function sumBy(array, iteratee) {
+  return (array && array.length)
+    ? baseSum(array, baseIteratee(iteratee, 2))
+    : 0;
 }
+// ...
 ```
 
 Should not transform this:

src/__fixtures__/with-cache/input.md

@@ -2,15 +2,15 @@ This is a test of the plugin
 
 Should not include language or range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js GITHUB-EMBED
 
 Should include language but not range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc javascript GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js javascript GITHUB-EMBED
 
 Should include language and range in code block:
 
-GITHUB-EMBED https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc javascript 1,5-8,14 GITHUB-EMBED
+GITHUB-EMBED https://github.com/lodash/lodash/blob/2900cfd/sumBy.js javascript 1,2,27-31 GITHUB-EMBED
 
 Should not transform this:
 

src/__tests__/fetchGithubContent.js

@@ -7,11 +7,11 @@ const token = process.env.GITHUB_TOKEN;
 
 test('Should succeed with valid GitHub URL', async () => {
   const actual = await fetchGithubFile(
-    'https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc',
+    'https://github.com/lodash/lodash/blob/2900cfd/sumBy.js',
     token,
     fetch,
   );
-  expect(actual.startsWith('{\n  "presets": [')).toBe(true);
+  expect(actual.startsWith('import baseIteratee from \'./_baseIteratee.js\';')).toBe(true);
 });
 
 test('Should throw if called with invalid GitHub URL', async () => {
@@ -27,7 +27,7 @@ test('Should throw when given URL points to non-existent GitHub content', async
   expect.assertions(1);
   try {
     await fetchGithubFile(
-      'https://github.com/huy-nguyen/squarify/blob/d7074c2/someFile',
+      'https://github.com/lodash/lodash/blob/2900cfd/someFile.js',
       token,
       fetch
     );
@@ -40,7 +40,7 @@ test('Should throw when given URL points to a GitHub directory', async () => {
   expect.assertions(1);
   try {
     await fetchGithubFile(
-      'https://github.com/huy-nguyen/squarify/blob/d7074c2/src',
+      'https://github.com/lodash/lodash/tree/2900cfd/.github',
       token,
       fetch
     );

src/__tests__/fetchGithubContentFail.js

@@ -11,7 +11,7 @@ test('Should handle failed AJAX request to valid GitHub URL', async () => {
   fetch.mockRejectedValue(new Error('Network error'));
   try {
     await fetchGithubFile(
-      'https://github.com/huy-nguyen/squarify/blob/d7074c2/.babelrc', token, fetch
+      'https://github.com/lodash/lodash/blob/2900cfd/sumBy.js', token, fetch
     );
   } catch (e) {
     expect(e.message).toMatch(/Network error/);

src/fetchGithubContent.ts

@@ -10,7 +10,7 @@ export const fetchGithubFile =
   if (parseResult !== null) {
     // If the provided URL is a valid GitHub URL:
     const {branch, path, repo, user} = parseResult;
-    const fetchUrl = `https://api.github.com/repos/${user}/${repo}/contents/${path}?branch=${branch}`;
+    const fetchUrl = `https://api.github.com/repos/${user}/${repo}/contents/${path}?ref=${branch}`;
 
     let response: Response;
     try {