1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/string/lstrip_spec.rb b/spec/ruby/core/string/lstrip_spec.rb
new file mode 100644
index 0000000000..7ef94be567
--- /dev/null
+++ b/spec/ruby/core/string/lstrip_spec.rb
@@ -0,0 +1,50 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#lstrip" do
+  it "returns a copy of self with leading whitespace removed" do
+   "  hello  ".lstrip.should == "hello  "
+   "  hello world  ".lstrip.should == "hello world  "
+   "\n\r\t\n\v\r hello world  ".lstrip.should == "hello world  "
+   "hello".lstrip.should == "hello"
+   "\000 \000hello\000 \000".lstrip.should == "\000 \000hello\000 \000"
+  end
+
+  it "does not strip leading \\0" do
+   "\x00hello".lstrip.should == "\x00hello"
+  end
+
+  it "taints the result when self is tainted" do
+    "".taint.lstrip.tainted?.should == true
+    "ok".taint.lstrip.tainted?.should == true
+    "   ok".taint.lstrip.tainted?.should == true
+  end
+end
+
+describe "String#lstrip!" do
+  it "modifies self in place and returns self" do
+    a = "  hello  "
+    a.lstrip!.should equal(a)
+    a.should == "hello  "
+
+    a = "\000 \000hello\000 \000"
+    a.lstrip!
+    a.should == "\000 \000hello\000 \000"
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "hello"
+    a.lstrip!.should == nil
+    a.should == "hello"
+  end
+
+  it "raises a RuntimeError on a frozen instance that is modified" do
+    lambda { "  hello  ".freeze.lstrip! }.should raise_error(RuntimeError)
+  end
+
+  # see [ruby-core:23657]
+  it "raises a RuntimeError on a frozen instance that would not be modified" do
+    lambda { "hello".freeze.lstrip! }.should raise_error(RuntimeError)
+    lambda { "".freeze.lstrip!      }.should raise_error(RuntimeError)
+  end
+end