1 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/library/coverage/supported_spec.rb b/spec/ruby/library/coverage/supported_spec.rb
new file mode 100644
index 0000000000..fcf8a76d79
--- /dev/null
+++ b/spec/ruby/library/coverage/supported_spec.rb
@@ -0,0 +1,30 @@
+require_relative '../../spec_helper'
+require 'coverage'
+
+describe "Coverage.supported?" do
+  it "returns true or false if coverage measurement is supported for the given mode" do
+    [true, false].should.include?(Coverage.supported?(:lines))
+    [true, false].should.include?(Coverage.supported?(:branches))
+    [true, false].should.include?(Coverage.supported?(:methods))
+    [true, false].should.include?(Coverage.supported?(:eval))
+  end
+
+  it "returns false for not existing modes" do
+    Coverage.supported?(:foo).should == false
+    Coverage.supported?(:bar).should == false
+  end
+
+  it "raise TypeError if argument is not Symbol" do
+    -> {
+      Coverage.supported?("lines")
+    }.should.raise(TypeError, "wrong argument type String (expected Symbol)")
+
+    -> {
+      Coverage.supported?([])
+    }.should.raise(TypeError, "wrong argument type Array (expected Symbol)")
+
+    -> {
+      Coverage.supported?(1)
+    }.should.raise(TypeError, "wrong argument type Integer (expected Symbol)")
+  end
+end