1 files changed, 45 insertions, 0 deletions
diff --git a/spec/ruby/core/math/log10_spec.rb b/spec/ruby/core/math/log10_spec.rb
new file mode 100644
index 0000000000..8164b9994d
--- /dev/null
+++ b/spec/ruby/core/math/log10_spec.rb
@@ -0,0 +1,45 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+# The common logarithm, having base 10
+describe "Math.log10" do
+  it "returns a float" do
+    Math.log10(1).should be_kind_of(Float)
+  end
+
+  it "returns the base-10 logarithm of the argument" do
+    Math.log10(0.0001).should be_close(-4.0, TOLERANCE)
+    Math.log10(0.000000000001e-15).should be_close(-27.0, TOLERANCE)
+    Math.log10(1).should be_close(0.0, TOLERANCE)
+    Math.log10(10).should be_close(1.0, TOLERANCE)
+    Math.log10(10e15).should be_close(16.0, TOLERANCE)
+  end
+
+  conflicts_with :Complex do
+    it "raises an Errno::EDOM if the argument is less than 0" do
+      lambda { Math.log10(-1e-15) }.should raise_error( Errno::EDOM)
+    end
+  end
+
+  it "raises a TypeError if the argument cannot be coerced with Float()" do
+    lambda { Math.log10("test") }.should raise_error(TypeError)
+  end
+
+  it "returns NaN given NaN" do
+    Math.log10(nan_value).nan?.should be_true
+  end
+
+  it "raises a TypeError if the argument is nil" do
+    lambda { Math.log10(nil) }.should raise_error(TypeError)
+  end
+
+  it "accepts any argument that can be coerced with Float()" do
+    Math.log10(MathSpecs::Float.new).should be_close(0.0, TOLERANCE)
+  end
+end
+
+describe "Math#log10" do
+  it "is accessible as a private instance method" do
+    IncludesMath.new.send(:log10, 4.15).should be_close(0.618048096712093, TOLERANCE)
+  end
+end