1 files changed, 47 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..7576a67002
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+++ b/spec/ruby/core/math/log10_spec.rb
@@ -0,0 +1,47 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+# The common logarithm, having base 10
+describe "Math.log10" do
+  it "returns a float" do
+    Math.log10(1).should.is_a?(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
+
+  it "raises an Math::DomainError if the argument is less than 0" do
+    -> { Math.log10(-1e-15) }.should.raise(Math::DomainError)
+  end
+
+  it "raises a TypeError if the argument cannot be coerced with Float()" do
+    -> { Math.log10("test") }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError if passed a numerical argument as a string" do
+    -> { Math.log10("1.0") }.should.raise(TypeError)
+  end
+
+  it "returns NaN given NaN" do
+    Math.log10(nan_value).nan?.should == true
+  end
+
+  it "raises a TypeError if the argument is nil" do
+    -> { Math.log10(nil) }.should.raise(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