Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 56 insertions, 0 deletions

diff --git a/spec/rubyspec/core/exception/set_backtrace_spec.rb b/spec/rubyspec/core/exception/set_backtrace_spec.rb
new file mode 100644
index 0000000000..db58a193ef
--- /dev/null
+++ b/spec/rubyspec/core/exception/set_backtrace_spec.rb
@@ -0,0 +1,56 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#set_backtrace" do
+  it "accepts an Array of Strings" do
+    err = RuntimeError.new
+    err.set_backtrace ["unhappy"]
+    err.backtrace.should == ["unhappy"]
+  end
+
+  it "allows the user to set the backtrace from a rescued exception" do
+    bt  = ExceptionSpecs::Backtrace.backtrace
+    err = RuntimeError.new
+
+    err.set_backtrace bt
+    err.backtrace.should == bt
+  end
+
+  it "accepts an empty Array" do
+    err = RuntimeError.new
+    err.set_backtrace []
+    err.backtrace.should == []
+  end
+
+  it "accepts a String" do
+    err = RuntimeError.new
+    err.set_backtrace "unhappy"
+    err.backtrace.should == ["unhappy"]
+  end
+
+  it "accepts nil" do
+    err = RuntimeError.new
+    err.set_backtrace nil
+    err.backtrace.should be_nil
+  end
+
+  it "raises a TypeError when passed a Symbol" do
+    err = RuntimeError.new
+    lambda { err.set_backtrace :unhappy }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the Array contains a Symbol" do
+    err = RuntimeError.new
+    lambda { err.set_backtrace ["String", :unhappy] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the array contains nil" do
+    err = Exception.new
+    lambda { err.set_backtrace ["String", nil] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the argument is a nested array" do
+    err = Exception.new
+    lambda { err.set_backtrace ["String", ["String"]] }.should raise_error(TypeError)
+  end
+end