Automatic caching of dependencies

in a best effort manner by default
allowing to specify files to hash for computing the cache key

__tests__/crypto-utils.test.ts

@@ -0,0 +1,33 @@
+import * as cryptoUtils from '../src/crypto-utils'
+import * as path from 'path'
+
+describe('crypto-utils', () => {
+    describe('can hash', () => {
+        it('a directory', async () => {
+            const hash = await cryptoUtils.hashFiles(
+                path.resolve('__tests__/data/basic/gradle')
+            )
+            expect(hash).toBe(
+                '4ebb65b45e6f6796d5ec6ace96e9471cc6573d294c54f99c4920fe5328e75bab'
+            )
+        })
+        it('a directory with a glob', async () => {
+            const hash = await cryptoUtils.hashFiles(
+                path.resolve('__tests__/data/basic/'),
+                ['gradle/**']
+            )
+            expect(hash).toBe(
+                '4ebb65b45e6f6796d5ec6ace96e9471cc6573d294c54f99c4920fe5328e75bab'
+            )
+        })
+        it('a directory with globs', async () => {
+            const hash = await cryptoUtils.hashFiles(
+                path.resolve('__tests__/data/basic/'),
+                ['**/*.gradle', 'gradle/**']
+            )
+            expect(hash).toBe(
+                '2db1d5291774949ab89e18e9d82ee24748ca0f6cc78de69ea9104357c50ad4a5'
+            )
+        })
+    })
+})

__tests__/data/basic/build.gradle

@@ -1,6 +1,11 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * This is a general purpose Gradle build.
- * Learn how to create Gradle builds at https://guides.gradle.org/creating-new-gradle-builds
- */
+plugins {
+    id 'java'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation('junit:junit:4.12')
+}

__tests__/data/basic/src/test/java/basic/BasicTest.java

@@ -0,0 +1,10 @@
+package basic;
+
+import org.junit.Test;
+
+public class BasicTest {
+    @Test
+    public void test() {
+        assert true;
+    }
+}