Use test from issue

Author: deepy

src/test/groovy/com/github/gradle/node/npm/task/NpmInstall_integTest.groovy

@@ -148,6 +148,19 @@ class NpmInstall_integTest extends AbstractIntegTest {
         then:
         result.task(':deleteNodeModules').outcome == TaskOutcome.SUCCESS
 
+        when:
+        result = build('npmInstall')
+
+        then:
+        result.task(":npmInstall").outcome == TaskOutcome.SUCCESS
+
+        when:
+        // when the node_modules is removed
+        result = build('deleteNodeModules')
+
+        then:
+        result.task(':deleteNodeModules').outcome == TaskOutcome.SUCCESS
+
         when:
         result = build('taskWithDependency')