Add unit tests for `Bundler::PathPreserver` module

1 files changed, 54 insertions, 0 deletions

diff --git a/spec/bundler/path_preserver_spec.rb b/spec/bundler/path_preserver_spec.rb
new file mode 100644
index 0000000000..78fda9aa40
--- /dev/null
+++ b/spec/bundler/path_preserver_spec.rb
@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+require "spec_helper"
+
+describe Bundler::PathPreserver do
+  describe "#preserve_path_in_environment" do
+    subject { described_class.preserve_path_in_environment(env_var, env) }
+
+    context "env_var is PATH" do
+      let(:env_var)       { "PATH" }
+      let(:path)          { "/path/here" }
+      let(:original_path) { "/original/path/here" }
+
+      context "when _ORIGINAL_PATH in env is nil" do
+        let(:env)  { { "ORIGINAL_PATH" => nil, "PATH" => path } }
+
+        it "should set _ORIGINAL_PATH of env to value of PATH from env" do
+          expect(env["_ORIGINAL_PATH"]).to be_nil
+          subject
+          expect(env["_ORIGINAL_PATH"]).to eq("/path/here")
+        end
+      end
+
+      context "when original_path in env is empty" do
+        let(:env)  { { "_ORIGINAL_PATH" => "", "PATH" => path } }
+
+        it "should set _ORIGINAL_PATH of env to value of PATH from env" do
+          expect(env["_ORIGINAL_PATH"]).to be_empty
+          subject
+          expect(env["_ORIGINAL_PATH"]).to eq("/path/here")
+        end
+      end
+
+      context "when path in env is nil" do
+        let(:env)  { { "_ORIGINAL_PATH" => original_path, "PATH" => nil } }
+
+        it "should set PATH of env to value of _ORIGINAL_PATH from env" do
+          expect(env["PATH"]).to be_nil
+          subject
+          expect(env["PATH"]).to eq("/original/path/here")
+        end
+      end
+
+      context "when path in env is empty" do
+        let(:env)  { { "_ORIGINAL_PATH" => original_path, "PATH" => "" } }
+
+        it "should set PATH of env to value of _ORIGINAL_PATH from env" do
+          expect(env["PATH"]).to be_empty
+          subject
+          expect(env["PATH"]).to eq("/original/path/here")
+        end
+      end
+    end
+  end
+end