Allow to pass parameters to Cucumber in Docker.

Also add some comments.

test/Dockerfile

@@ -21,6 +21,13 @@ RUN groupadd -r test \
 USER test
 RUN curl -s "https://get.sdkman.io" | bash
 
+# To speed up tests, uncomment this shared setup:
+#SHELL ["/bin/bash", "-c"]
+#RUN source "$TEST_HOME/.sdkman/bin/sdkman-init.sh" \
+# && sdk install ant 1.9.9 \
+# && sdk install ant 1.10.1 \
+# && sdk install crash
+
 # "Install" sdkman-for-fish
 RUN mkdir -p $TEST_HOME/.config/fish/
 COPY --chown=test:test completions $TEST_HOME/.config/fish/completions/
@@ -30,4 +37,5 @@ RUN ls -R $TEST_HOME/.config/fish/
 
 # Run tests
 COPY test ./
-CMD cucumber
+ENTRYPOINT ["cucumber"]
+CMD []

test/features/step_definitions/setup.rb

@@ -7,6 +7,15 @@ Given(/^SDKMAN! candidate list is up to date$/) do
 end
 
 Given(/^candidate (\w+) is installed at version (\d+(?:\.\d+)*)$/) do |candidate, version|
+  # TODO: Can we mock-install instead?
+  #       Something like
+  #
+  #         mkdir -p ${SDKMAN_CANDIDATES_DIR}/${candidate}/{version}/bin \
+  #           && touch ${SDKMAN_CANDIDATES_DIR}/${candidate}/${version}/bin/${candidate} &&
+  #           ln -s ${SDKMAN_CANDIDATES_DIR}/${candidate}/current ${SDKMAN_CANDIDATES_DIR}/${candidate}/${version}
+  #
+  #       should be quite enough to trick sdk as far as we need it to trick.
+  #       Or is it?
   run_bash_command("sdk install #{candidate} #{version}") unless installed?(candidate, version)
 end