Add simple regression tests for openapi2jsonschema

scripts/Dockerfile.bats

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+FROM python:3.9.7-alpine3.14
+RUN apk --no-cache add bats
+COPY acceptance.bats openapi2jsonschema.py requirements.txt /code/
+COPY fixtures /code/fixtures
+WORKDIR /code
+RUN pip install -r requirements.txt

scripts/Makefile

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+#!/usr/bin/make -f
+
+# This is really early days
+
+build-python-bats:
+	docker build -t python-bats -f Dockerfile.bats .
+
+docker-acceptance: build-python-bats
+	docker run --entrypoint "/usr/bin/bats" -t python-bats /code/acceptance.bats

scripts/acceptance.bats

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+#!/usr/bin/env bats
+
+@test "Should generate expected prometheus resource" {
+  run ./openapi2jsonschema.py fixtures/prometheus-operator-0prometheusCustomResourceDefinition.yaml
+  [ "$status" -eq 0 ]
+  [ "$output" = "JSON schema written to prometheus_v1.json" ]
+  run diff prometheus_v1.json ./fixtures/prometheus_v1-expected.json
+  [ "$status" -eq 0 ]
+}

scripts/requirements.txt

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+pyyaml