diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Understanding assertions/base_conversion/octal_converter.rb b/Understanding assertions/base_conversion/octal_converter.rb
new file mode 100644
index 0000000..e7ca4fa
--- /dev/null
+++ b/Understanding assertions/base_conversion/octal_converter.rb	
@@ -0,0 +1,19 @@
+class OctalConverter
+  def initialize(number)
+    @number = number
+  end
+
+  def convert
+    octal = []
+    if @number < 8
+      octal << @number
+    else
+      until @number.zero?
+        remainder = @number % 8
+        @number = @number / 8
+        octal.unshift(remainder)
+      end
+    end
+    octal
+  end
+end
\ No newline at end of file
diff --git a/Understanding assertions/base_conversion/test_octal_converter.rb b/Understanding assertions/base_conversion/test_octal_converter.rb
new file mode 100644
index 0000000..d1dc6b8
--- /dev/null
+++ b/Understanding assertions/base_conversion/test_octal_converter.rb	
@@ -0,0 +1,10 @@
+require 'minitest/autorun'
+require_relative 'octal_converter'
+
+describe OctalConverter do
+  it 'should return 137 for 95' do
+    converter = OctalConverter.new(137)
+    result = converter.convert
+    assert_equal [2, 1, 1], result
+  end
+end
\ No newline at end of file