@Test
    public void simpleTest() throws Exception {
        final String release = container.execInContainer("cat", "/etc/alpine-release").getStdout();

        assertThat(release).as("/etc/alpine-release starts with " + expectedVersion).startsWith(expectedVersion);
    }
Simple test case / demonstration of creating a fresh container image from a Dockerfile DSL when the test
is parameterized.
core/src/test/java/org/testcontainers/junit/ParameterizedDockerfileContainerTest.java