New test to verify issue #17 (#19)

* add backend-config init test and fixture for #17

* remove extra file

* add missing boilerplate to fixture

test/fixtures/backend_config/backend.tf

@@ -0,0 +1,19 @@
+/**
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+terraform {
+  backend "local" {}
+}

test/fixtures/backend_config/main.tf

@@ -0,0 +1,20 @@
+/**
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+resource "local_file" "foo" {
+  content  = "foo!"
+  filename = "${path.module}/foo.bar"
+}

test/test_backend_config.py

@@ -0,0 +1,36 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"Test the plan output wrapper classes."
+
+import pytest
+import tftest
+
+
+@pytest.fixture
+def run_init(fixtures_dir):
+
+  def init_runner(**backend_config):
+    tf = tftest.TerraformTest('apply', fixtures_dir)
+    tf.setup(init_vars=backend_config)
+
+  return init_runner
+
+
+def test_simple_args(run_init):
+  run_init(path='terraform-1.tfstate')
+
+
+def test_spaced_args(run_init):
+  run_init(path='terraform 1.tfstate')