provider/aws: add test for provider aliases

Not sure if this test has value /cc @mitchellh (who requested one be
added) to see what I might be missing here.

refs #2495

terraform/context_test.go

@@ -4423,6 +4423,37 @@ func TestContext2Apply_moduleProviderAlias(t *testing.T) {
 	}
 }
 
+func TestContext2Apply_moduleProviderAliasTargets(t *testing.T) {
+	m := testModule(t, "apply-module-provider-alias")
+	p := testProvider("aws")
+	p.ApplyFn = testApplyFn
+	p.DiffFn = testDiffFn
+	ctx := testContext2(t, &ContextOpts{
+		Module: m,
+		Providers: map[string]ResourceProviderFactory{
+			"aws": testProviderFuncFixed(p),
+		},
+		Targets: []string{"no.thing"},
+	})
+
+	if _, err := ctx.Plan(); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	state, err := ctx.Apply()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	actual := strings.TrimSpace(state.String())
+	expected := strings.TrimSpace(`
+<no state>
+	`)
+	if actual != expected {
+		t.Fatalf("bad: \n%s", actual)
+	}
+}
+
 func TestContext2Apply_moduleVarResourceCount(t *testing.T) {
 	m := testModule(t, "apply-module-var-resource-count")
 	p := testProvider("aws")