Add preview "e2e" test for a basic RDS module

This uses the db.t4g.large but the test just crashes on the provisioning so that's fun

Working preview

Author: guineveresaenger

tests/acc_test.go

@@ -556,6 +556,63 @@ func TestIntegration(t *testing.T) {
 	}
 }
 
+// Some resources take minutes to provision and destroy.
+// TestPreview is for such resources, where we only verify that preview works as expected.
+func TestPreview(t *testing.T) {
+
+	type testCase struct {
+		name            string // Must be same as project folder in testdata/programs/ts
+		moduleName      string
+		moduleVersion   string
+		moduleNamespace string
+		previewExpect   map[apitype.OpType]int
+	}
+
+	testcases := []testCase{
+		{
+			name:            "rdsmod",
+			moduleName:      "terraform-aws-modules/rds/aws",
+			moduleVersion:   "6.10.0",
+			moduleNamespace: "rds",
+			previewExpect: map[apitype.OpType]int{
+				apitype.OpType("create"): 6,
+			},
+		},
+	}
+
+	for _, tc := range testcases {
+		tc := tc
+		localProviderBinPath := ensureCompiledProvider(t)
+		skipLocalRunsWithoutCreds(t)
+		t.Run(tc.name, func(t *testing.T) {
+			testProgram := filepath.Join("testdata", "programs", "ts", tc.name)
+			localPath := opttest.LocalProviderPath("terraform-module", filepath.Dir(localProviderBinPath))
+			previewTest := pulumitest.NewPulumiTest(t, testProgram, localPath)
+
+			// Get a prefix for resource names
+			prefix := generateTestResourcePrefix()
+
+			// Set prefix via config
+			previewTest.SetConfig(t, "prefix", prefix)
+
+			// Generate package
+			pulumiPackageAdd(
+				t,
+				previewTest,
+				localProviderBinPath,
+				tc.moduleName,
+				tc.moduleVersion,
+				tc.moduleNamespace)
+
+			// Preview
+			previewResult := previewTest.Preview(t)
+			t.Log(previewResult.StdOut)
+			t.Log(previewResult.StdErr)
+			autogold.Expect(tc.previewExpect).Equal(t, previewResult.ChangeSummary)
+		})
+	}
+}
+
 func TestDiffDetail(t *testing.T) {
 	// Set up a test Bucket
 	localProviderBinPath := ensureCompiledProvider(t)

tests/testdata/programs/ts/rdsmod/Pulumi.yaml

@@ -0,0 +1,7 @@
+name: rdsmod
+runtime: nodejs
+description: A minimal TypeScript Pulumi program
+config:
+  pulumi:tags:
+    value:
+      pulumi:template: typescript

tests/testdata/programs/ts/rdsmod/index.ts

@@ -0,0 +1,21 @@
+import * as pulumi from "@pulumi/pulumi";
+import * as rds from "@pulumi/rds";
+
+
+const testrds = new rds.Module("test-rds", {
+    identifier: "test-rds-module",
+    engine: "mysql",
+    instance_class: "db.t3.micro",
+    allocated_storage: 20,
+    db_name: "testrdsmoduledatabase",
+    username: "pulumipus",
+    password: "hawaii",
+    skip_final_snapshot: true,
+    deletion_protection: false,
+
+    // DB parameter group
+    family: "mysql8.0",
+
+    // DB option group
+    major_engine_version: "8.0",
+})

tests/testdata/programs/ts/rdsmod/package.json

@@ -0,0 +1,11 @@
+{
+	"name": "rdsmod",
+	"devDependencies": {
+		"@types/node": "^14"
+	},
+	"dependencies": {
+		"@pulumi/pulumi": "^3.0.0",
+		"@pulumi/terraform-aws-modules": "file:sdks/terraform-aws-modules",
+		"typescript": "^4.0.0"
+	}
+}