Add Temperature acceptance test

Author: AlexB52

test/units/temperature_test.rb

@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+Measured::Temperature = Measured.build do
+  unit :C, aliases: [:c, :celsius]
+
+  unit :K, value: [
+    {
+      conversion: ->(k) { k - BigDecimal('273.15') },
+      reverse_conversion: ->(c) { c + BigDecimal('273.15') },
+      description: 'celsius + 273.15'
+    }, 'C'], aliases: [:k, :kelvin]
+
+  unit :F, value: [
+    {
+      conversion: ->(f) { (f-32) * Rational(5,9) },
+      reverse_conversion: ->(c) { c * Rational(9,5) + 32 },
+      description: '9 * celsius / 5 + 32'
+    }, 'C'], aliases: [:f, :farenheit]
+end
+
+require "test_helper"
+
+class Measured::TemperatureTest < ActiveSupport::TestCase
+  test ".unit_names should be the list of base unit names" do
+    expected_units = %w(C F K)
+    assert_equal expected_units.sort, Measured::Temperature.unit_names
+  end
+
+  test ".name" do
+    assert_equal "temperature", Measured::Temperature.name
+  end
+
+  test "Measured::Temperature() delegates automatically to .new" do
+    assert_equal Measured::Temperature.new(1, :C), Measured::Temperature(1, :C)
+  end
+
+  test ".convert_to from C to K" do
+    assert_exact_conversion Measured::Temperature, "0 C", "273.15 K"
+    assert_exact_conversion Measured::Temperature, "10 C", "283.15 K"
+  end
+
+  test ".convert_to from C to F" do
+    assert_exact_conversion Measured::Temperature, "45 C", "113 F"
+    assert_exact_conversion Measured::Temperature, "0 C", "32 F"
+  end
+
+  test ".convert_to from F to C" do
+    assert_exact_conversion Measured::Temperature, "113 F", "45 C"
+    assert_exact_conversion Measured::Temperature, "32 F", "0 C"
+  end
+
+  test ".convert_to from F to K" do
+    assert_exact_conversion Measured::Temperature, "32 F", "273.15 K"
+  end
+
+  test ".convert_to from K to C" do
+    assert_exact_conversion Measured::Temperature, "273.15 K", "0 C"
+    assert_exact_conversion Measured::Temperature, "0 K", "-273.15 C"
+  end
+
+  test ".convert_to from K to F" do
+    assert_exact_conversion Measured::Temperature, "0 K", "-459.67 F"
+  end
+end