Migrate wrapper test to Cucumber.

test/features/step_definitions/completion.rb

@@ -4,10 +4,9 @@ require 'open3'
 
 module CompletionHelper
   def complete(cmd)
-    completions = run_fish_command("complete -C\"sdk #{cmd}\"")
+    completions = run_fish_command("complete -C\"sdk #{cmd}\"")[:stdout]
 
-    completions.split("\n") \
-               .map { |line| line.split(/\s+/)[0].strip }
+    completions.map { |line| line.split(/\s+/)[0].strip }
     # TODO: Why do we get duplicates in the Docker container?
   end
 end

test/features/step_definitions/wrapper.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module WrapperHelper
+  def reject_then_select(lines, exclude, select)
+    lines.select do |e|
+      (exclude.nil? || e !~ exclude) && e =~ select
+    end.sort
+  end
+
+  def compare_env(exclude, include)
+    env_bash = reject_then_select(@response_bash[:env], exclude, include)
+    env_fish = reject_then_select(@response_fish[:env], exclude, include)
+    expect(env_fish).to eq(env_bash)
+  end
+end
+World WrapperHelper
+
+When('we run {string} in Bash and Fish') do |command|
+  @response_bash = run_bash_command(command)
+  @response_fish = run_fish_command(command)
+end
+
+Then('the exit code is the same') do
+  expect(@response_fish[:status]).to eq(@response_bash[:status])
+end
+
+Then('the output is the same') do
+  %i[stdout stderr].each do |out|
+    expect(@response_fish[out]).to eq(@response_bash[out])
+  end
+end
+
+Then('environment variable(s) {env_glob} is/are the same') do |pattern|
+  compare_env(nil, pattern)
+end
+
+Then('environment variable(s) {env_glob} is/are the same except for {env_glob}') do |pattern, exclude_pattern|
+  compare_env(exclude_pattern, pattern)
+end

test/features/support/helpers.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+require 'fileutils'
+require 'tmpdir'
+
 def list_installed_candidates
   candidates = {}
 
@@ -17,26 +20,70 @@ end
 
 def installed?(candidate, version = nil)
   candidates = list_installed_candidates
-  candidates.key?(candidate) && (version.nil? || candidates[candidate].include?(version))
+  candidates.key?(candidate) \
+                  && (version.nil? || candidates[candidate].include?(version))
 end
 
 def run_bash_command(cmd)
-  stdout, stderr, status = Open3.capture3("bash -c 'source \"$HOME/.sdkman/bin/sdkman-init.sh\"; #{cmd}'")
-  unless status.success?
-    warn(stderr)
-    raise "Bash command failed: #{stderr}"
-  end
+  Dir.mktmpdir(%w[sdkman-for-fish-test_ _fish]) do |tmp_dir|
+    files = %i[status stdout stderr env].map { |s|
+      [s, FileUtils.touch("#{tmp_dir}/#{s}")[0]]
+    }.to_h
 
-  stdout
+    out, status = Open3.capture2e(<<~BASH
+      bash -c 'source "#{ENV['HOME']}/.sdkman/bin/sdkman-init.sh" && \
+               #{cmd} > #{files[:stdout]} 2> #{files[:stderr]}; \
+               echo "$?" > #{files[:status]}; \
+               env > #{files[:env]}; \
+              '
+    BASH
+    )
+
+    unless status.success?
+      warn(out)
+      raise "Bash command failed: #{out}"
+    end
+
+    {
+      status: File.read(files[:status]).to_i,
+      stdout: File.readlines(files[:stdout]),
+      stderr: File.readlines(files[:stderr]),
+      env: File.readlines(files[:env])
+    }
+  end
 end
 
+# # For nicer diffs: one entry per line, sorted
+# string split ":" (cat path_bash) | sort > path_bash
+# string split ":" (cat path_fish) \
+#       | string split " " \
+#       | sort > path_fish
+# # split by spaces for fish 2.*
+
 def run_fish_command(cmd)
-  # NB: Fish errors out if we don't set terminal dimensions
-  stdout, stderr, status = Open3.capture3("fish -c 'stty rows 80 columns 80; #{cmd}'")
-  unless status.success?
-    warn(stderr)
-    raise 'Fish command failed'
-  end
+  Dir.mktmpdir(%w[sdkman-for-fish-test_ _fish]) do |tmp_dir|
+    files = %i[status stdout stderr env].map { |s|
+      [s, FileUtils.touch("#{tmp_dir}/#{s}")[0]]
+    }.to_h
 
-  stdout
+    out, status = Open3.capture2e(<<~FISH
+      fish -c '#{cmd} > #{files[:stdout]} ^ #{files[:stderr]}; \
+               echo $status > #{files[:status]}; \
+               env > #{files[:env]}; \
+              '
+    FISH
+    )
+
+    unless status.success?
+      warn(out)
+      raise "Fish command failed: #{out}"
+    end
+
+    {
+      status: File.read(files[:status]).to_i,
+      stdout: File.readlines(files[:stdout]),
+      stderr: File.readlines(files[:stderr]),
+      env: File.readlines(files[:env])
+    }
+  end
 end

test/features/support/parameter_types.rb

@@ -19,3 +19,12 @@ ParameterType(
                    end
                end
 )
+
+ParameterType(
+  name: 'env_glob',
+  regexp: /[A-Z_*]+/,
+  type: Regexp,
+  transformer: lambda do |glob|
+    /^#{glob.gsub('*', '[A-Z_]*')}=/
+  end
+)

test/features/wrapper.feature

@@ -0,0 +1,30 @@
+Feature: Wrapping of Bash
+    All calls to sdk are performed through Bash;
+    we need to wrap those calls in such a way that
+    the effect sdk has on the Bash environment carries
+    over the current Fish session.
+
+    We verifiy equality of (standard) output, exit code, and environment variables.
+
+    Background:
+        Given SDKMAN! candidate list is up to date
+        And   candidate ant is installed at version 1.9.9
+        And   candidate ant is installed at version 1.10.1
+
+    Scenario Outline:
+        When we run "<command>" in Bash and Fish
+        Then the exit code is the same
+        And  the output is the same
+        And  environment variable PATH is the same
+        And  environment variables *_HOME are the same
+        And  environment variables SDKMAN_* are the same except for SDKMAN_OFFLINE_MODE
+             # NB: SDKMAN_OFFLINE_MODE is not an environment variable in bash, so ignore it here.
+        Examples:
+            | command                                             |
+            | sdk                                                 |
+            | sdk version                                         |
+            | sdk list java                                       |
+            | sdk update                                          |
+            | sdk use ant 1.9.9                                   |
+            | sdk offline enable > /dev/null; sdk install ant foo |
+            | sdk use ant 1.9.9 > /dev/null; sdk broadcast        |