Add spec for Tempfile.create

Author: trinistr

library/tempfile/callback_spec.rb

@@ -0,0 +1,114 @@
+require_relative '../../spec_helper'
+require 'tempfile'
+
+describe "Tempfile.create" do
+  after :each do
+    if @tempfile
+      @tempfile.close
+      File.unlink(@tempfile.path) if File.file?(@tempfile.path)
+    end
+  end
+
+  it "returns a new, open File instance placed in tmpdir" do
+    @tempfile = Tempfile.create
+    # Unlike Tempfile.open this returns a true File,
+    # but `.should be_an_instance_of(File)` would be true either way.
+    @tempfile.instance_of?(File).should be_true
+
+    @tempfile.should_not.closed?
+    File.file?(@tempfile.path).should be_true
+
+    @tempfile.path.should.start_with?(Dir.tmpdir)
+    @tempfile.path.should_not == "#{Dir.tmpdir}/"
+  end
+
+  it "returns a writable, readable file" do
+    @tempfile = Tempfile.create
+    File.writable?(@tempfile.path).should be_true
+    @tempfile << "Test!\nMore test!"
+    @tempfile.seek(0)
+    @tempfile.gets.should == "Test!\n"
+  end
+
+  it "returns a private file" do
+    @tempfile = Tempfile.create
+    @tempfile.stat.mode.to_s(8).should.end_with?("600")
+  end
+
+  context "when called with a block" do
+    it "returns the value of the block" do
+      value = Tempfile.create do |tempfile|
+        tempfile << "Test!"
+        @tempfile = tempfile
+        "return"
+      end
+      value.should == "return"
+    end
+
+    it "closes and unlinks file after block execution" do
+      Tempfile.create do |tempfile|
+        @tempfile = tempfile
+        @tempfile.should_not.closed?
+        File.file?(@tempfile.path).should be_true
+      end
+
+      @tempfile.should.closed?
+      File.file?(@tempfile.path).should be_false
+    end
+  end
+
+  context "when called with a single positional argument" do
+    it "uses a String as a prefix for the filename" do
+      @tempfile = Tempfile.create("create_spec")
+      @tempfile.path.should.start_with?("#{Dir.tmpdir}/create_spec")
+      @tempfile.path.should_not == "#{Dir.tmpdir}/create_spec"
+    end
+
+    it "uses an array of two Strings as a prefix and suffix for the filename" do
+      @tempfile = Tempfile.create(["create_spec", ".temp"])
+      @tempfile.path.should.start_with?("#{Dir.tmpdir}/create_spec")
+      @tempfile.path.should.end_with?(".temp")
+    end
+
+    it "ignores more than two elements in the array" do
+      @tempfile = Tempfile.create(["create_spec", ".temp", :".txt"])
+      @tempfile.path.should.start_with?("#{Dir.tmpdir}/create_spec")
+      @tempfile.path.should.end_with?(".temp")
+    end
+
+    it "raises ArgumentError if passed something else than a String or an array of Strings" do
+      -> { Tempfile.create(:temp) }.should raise_error(ArgumentError, "unexpected prefix: :temp")
+      -> { Tempfile.create(["create_spec", :temp]) }.should raise_error(ArgumentError, "unexpected suffix: :temp")
+    end
+  end
+
+  context "when called with a second positional argument" do
+    it "uses it as a directory for the tempfile" do
+      @tempfile = Tempfile.create("create_spec", "./")
+      @tempfile.path.should.start_with?("./create_spec")
+    end
+
+    it "raises TypeError if argument can not be converted to a String" do
+      -> { Tempfile.create("create_spec", :temp) }.should raise_error(TypeError, "no implicit conversion of Symbol into String")
+    end
+  end
+
+  context "when called with a mode option" do
+    it "ORs it with the default mode, forcing it to be writable" do
+      @tempfile = Tempfile.create(mode: File::RDONLY)
+      File.writable?(@tempfile.path).should be_true
+    end
+
+    it "raises NoMethodError if passed something else than an Integer" do
+      -> { Tempfile.create(mode: "wb") }.should raise_error(NoMethodError, "undefined method '|' for an instance of String")
+    end
+  end
+
+  context "when called with other options" do
+    it "passes them along to File.open" do
+      @tempfile = Tempfile.create(encoding: "IBM037:IBM037", binmode: true)
+      @tempfile.external_encoding.should == Encoding.find("IBM037")
+      @tempfile.binmode?.should be_true
+    end
+  end
+end