Add tests for DependencyGraph

lib/DependencyGraph.test.js

@@ -0,0 +1,20 @@
+'use strict'
+const test = require('ava')
+const path = require('path')
+const createDependencyGraph = require('./DependencyGraph.js')
+
+function resolveArray(arr) {
+  return arr.map((p) => path.resolve(p))
+}
+
+test('tracks dependencies', (t) => {
+  const graph = createDependencyGraph()
+  graph.add({ file: 'aa', parent: 'a' })
+  graph.add({ file: 'bb', parent: 'b' })
+  graph.add({ file: 'ab', parent: 'a' })
+  graph.add({ file: 'ab', parent: 'b' })
+  t.deepEqual(graph.dependantsOf('aa'), resolveArray(['a']))
+  t.deepEqual(graph.dependantsOf('bb'), resolveArray(['b']))
+  t.deepEqual(graph.dependantsOf('ab'), resolveArray(['a', 'b']))
+  t.deepEqual(graph.dependantsOf('nonexistent'), [])
+})

package.json

@@ -48,7 +48,8 @@
   "files": [
     "bin",
     "index.js",
-    "lib"
+    "lib",
+    "!*.test.js"
   ],
   "keywords": [
     "cli",