Verify (re-)initialization of SDKMAN env vars works.

- Add new test that covers the two cases considered so far.

Housekeeping:

 - Add `.gitignore`
 - Add `.editorconfig`

.editorconfig

@@ -0,0 +1,5 @@
+[*]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitignore

@@ -0,0 +1,2 @@
+test/*_fish
+test/*_bash

.travis.yml

@@ -23,5 +23,6 @@ install:
 script:
     - ruby test/completion.rb
     - fish test/wrapper.fish
+    - fish test/reinitialize.fish
     - bash -c "sdk install crash 1.3.0; sdk uninstall crash 1.3.0"; fish test/10_zombies_new.fish
 

test/reinitialize.fish

@@ -0,0 +1,25 @@
+# If either of
+#   - $SDKMAN_DIR is unset
+#   - $SDKMAN_DIR points to a directory not owned by the current user
+# is true, sdkman-for-fish should run sdkman's init script.
+
+# Assumes sdkman-for-fish is installed
+set proper_value "$SDKMAN_DIR"
+
+begin
+    set -e SDKMAN_DIR
+    set in_new_shell (fish -lc 'echo $SDKMAN_DIR')
+    if [ "$in_new_shell" != "$proper_value" ]
+      echo "SDKMAN_DIR initialized to $in_new_shell instead of $proper_value"
+      exit 1
+    end
+end
+
+begin
+    set SDKMAN_DIR "/" # belongs to root, who hopefully doesn't run this
+    set in_new_shell (fish -lc 'echo $SDKMAN_DIR')
+    if [ "$in_new_shell" != "$proper_value" ]
+      echo "SDKMAN_DIR reinitialized to $in_new_shell instead of $proper_value"
+      exit 1
+    end
+end