Add dugite tests

.github/workflows/test.yml

@@ -12,6 +12,9 @@ jobs:
     steps:
     - name: Checkout the latest code
       uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+        # Make sure we get all commits, since testing uses the local git info
     - name: Setup Node
       uses: actions/setup-node@v3
       with:

test/fixtures/getDiff.artifact.fixture.txt

@@ -0,0 +1 @@
+DO NOT CHANGE THIS FILE

test/fixtures/getDiff.fixture.txt

@@ -0,0 +1,7 @@
+diff --git a/test/fixtures/getDiff.artifact.fixture.txt b/test/fixtures/getDiff.artifact.fixture.txt
+index 6b08561..88e9a2c 100644
+--- a/test/fixtures/getDiff.artifact.fixture.txt
++++ b/test/fixtures/getDiff.artifact.fixture.txt
+@@ -1 +1 @@
+-Never Change this File
++DO NOT CHANGE THIS FILE

test/index.test.js

@@ -1,8 +1,8 @@
 const { deepEqual } = require("assert");
-const { translateLinesGivenDiff, diffPositionToFilePosition } = require("../src/index.js");
+const { translateLinesGivenDiff, diffPositionToFilePosition, getDiff } = require("../src/index.js");
 const { readFileSync } = require("fs");
 
-const fixture = require('js-yaml').safeLoad(readFileSync(require.resolve('./index.fixture.yaml')))
+const fixture = require('js-yaml').safeLoad(readFileSync(require.resolve('./fixtures/index.fixture.yaml')))
 
 describe('translateLinesGivenDiff', () => {
   it('translates rows after applying a diff', () => {
@@ -64,3 +64,12 @@ describe('diffPositionToFilePosition', () => {
     })
   })
 })
+
+describe('getDiff', () => {
+  it('returns accurate getDiff', async () => {
+    // Use this repo's git info, checking the artifact fixture file
+    const diff = await getDiff('./', 'test/fixtures/getDiff.artifact.fixture.txt', '286ccffe38885e731ed4894989dbc6d2c0f85f72');
+    const diffFixture = readFileSync(require.resolve('./fixtures/getDiff.fixture.txt'), "utf8");
+    deepEqual(diff, diffFixture);
+  });
+});