2 files changed, 51 insertions, 1 deletions
diff --git a/Library/Homebrew/language/node.rb b/Library/Homebrew/language/node.rb
index 47431e8e5..01d41041b 100644
--- a/Library/Homebrew/language/node.rb
+++ b/Library/Homebrew/language/node.rb
@@ -25,7 +25,11 @@ module Language
       npmrc.write npm_cache_config
       # explicitly use our npm and node-gyp executables instead of the user
       # managed ones in HOMEBREW_PREFIX/lib/node_modules which might be broken
-      ENV.prepend_path "PATH", Formula["node"].opt_libexec/"bin"
+      begin
+        ENV.prepend_path "PATH", Formula["node"].opt_libexec/"bin"
+      rescue FormulaUnavailableError
+        nil
+      end
     end
 
     def self.std_npm_install_args(libexec)
diff --git a/Library/Homebrew/test/language/node_spec.rb b/Library/Homebrew/test/language/node_spec.rb
new file mode 100644
index 000000000..b2114bc4f
--- /dev/null
+++ b/Library/Homebrew/test/language/node_spec.rb
@@ -0,0 +1,46 @@
+require "language/node"
+
+describe Language::Node do
+  describe "#setup_npm_environment" do
+    it "does nothing when npmrc exists" do
+      expect(subject.setup_npm_environment).to be_nil
+    end
+
+    it "calls prepend_path when node formula exists and npmrc does not exist" do
+      node = formula "node" do
+        url "node-test"
+      end
+      stub_formula_loader(node)
+      allow_any_instance_of(Pathname).to receive(:exist?).and_return(false)
+      expect(ENV).to receive(:prepend_path)
+      subject.setup_npm_environment
+    end
+
+    it "does not call prepend_path when node formula does not exist but npmrc exists" do
+      allow_any_instance_of(Pathname).to receive(:exist?).and_return(false)
+      expect(subject.setup_npm_environment).to be_nil
+    end
+  end
+
+  describe "#std_npm_install_args" do
+    npm_install_arg = "libexec"
+
+    it "raises error with non zero exitstatus" do
+      expect { subject.std_npm_install_args(npm_install_arg) }.to \
+        raise_error("npm failed to pack #{Dir.pwd}")
+    end
+
+    it "does not raise error with a zero exitstatus" do
+      allow(Utils).to receive(:popen_read).with("npm pack").and_return("pack")
+      allow_any_instance_of(Process::Status).to receive(:exitstatus).and_return(0)
+      allow_any_instance_of(nil::NilClass).to receive(:exitstatus).and_return(0)
+      resp = subject.std_npm_install_args(npm_install_arg)
+      expect(resp).to include("--prefix=#{npm_install_arg}", "#{Dir.pwd}/pack")
+    end
+  end
+
+  specify "#local_npm_install_args" do
+    resp = subject.local_npm_install_args
+    expect(resp).to include("--verbose")
+  end
+end