From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/test/bigdecimal/test_bigmath.rb | 80 ++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 jni/ruby/test/bigdecimal/test_bigmath.rb

(limited to 'jni/ruby/test/bigdecimal/test_bigmath.rb')

diff --git a/jni/ruby/test/bigdecimal/test_bigmath.rb b/jni/ruby/test/bigdecimal/test_bigmath.rb
new file mode 100644
index 0000000..740c755
--- /dev/null
+++ b/jni/ruby/test/bigdecimal/test_bigmath.rb
@@ -0,0 +1,80 @@
+require_relative "testbase"
+require "bigdecimal/math"
+
+class TestBigMath < Test::Unit::TestCase
+  include TestBigDecimalBase
+  include BigMath
+  N = 20
+  PINF = BigDecimal("+Infinity")
+  MINF = BigDecimal("-Infinity")
+  NAN = BigDecimal("NaN")
+
+  def test_const
+    assert_in_delta(Math::PI, PI(N))
+    assert_in_delta(Math::E, E(N))
+  end
+
+  def test_sqrt
+    assert_in_delta(2**0.5, sqrt(BigDecimal("2"), N))
+    assert_equal(10, sqrt(BigDecimal("100"), N))
+    assert_equal(0.0, sqrt(BigDecimal("0"), N))
+    assert_equal(0.0, sqrt(BigDecimal("-0"), N))
+    assert_raise(FloatDomainError) {sqrt(BigDecimal("-1.0"), N)}
+    assert_raise(FloatDomainError) {sqrt(NAN, N)}
+    assert_raise(FloatDomainError) {sqrt(PINF, N)}
+  end
+
+  def test_sin
+    assert_in_delta(0.0, sin(BigDecimal("0.0"), N))
+    assert_in_delta(Math.sqrt(2.0) / 2, sin(PI(N) / 4, N))
+    assert_in_delta(1.0, sin(PI(N) / 2, N))
+    assert_in_delta(0.0, sin(PI(N) * 2, N))
+    assert_in_delta(0.0, sin(PI(N), N))
+    assert_in_delta(-1.0, sin(PI(N) / -2, N))
+    assert_in_delta(0.0, sin(PI(N) * -2, N))
+    assert_in_delta(0.0, sin(-PI(N), N))
+    assert_in_delta(0.0, sin(PI(N) * 21, N))
+    assert_in_delta(0.0, sin(PI(N) * 30, N))
+    assert_in_delta(-1.0, sin(PI(N) * BigDecimal("301.5"), N))
+  end
+
+  def test_cos
+    assert_in_delta(1.0, cos(BigDecimal("0.0"), N))
+    assert_in_delta(Math.sqrt(2.0) / 2, cos(PI(N) / 4, N))
+    assert_in_delta(0.0, cos(PI(N) / 2, N))
+    assert_in_delta(1.0, cos(PI(N) * 2, N))
+    assert_in_delta(-1.0, cos(PI(N), N))
+    assert_in_delta(0.0, cos(PI(N) / -2, N))
+    assert_in_delta(1.0, cos(PI(N) * -2, N))
+    assert_in_delta(-1.0, cos(-PI(N), N))
+    assert_in_delta(-1.0, cos(PI(N) * 21, N))
+    assert_in_delta(1.0, cos(PI(N) * 30, N))
+    assert_in_delta(0.0, cos(PI(N) * BigDecimal("301.5"), N))
+  end
+
+  def test_atan
+    assert_equal(0.0, atan(BigDecimal("0.0"), N))
+    assert_in_delta(Math::PI/4, atan(BigDecimal("1.0"), N))
+    assert_in_delta(Math::PI/6, atan(sqrt(BigDecimal("3.0"), N) / 3, N))
+    assert_in_delta(Math::PI/2, atan(PINF, N))
+    assert_equal(BigDecimal("0.823840753418636291769355073102514088959345624027952954058347023122539489"),
+                 atan(BigDecimal("1.08"), 72).round(72), '[ruby-dev:41257]')
+  end
+
+  def test_log
+    assert_equal(0, BigMath.log(BigDecimal("1.0"), 10))
+    assert_in_epsilon(Math.log(10)*1000, BigMath.log(BigDecimal("1e1000"), 10))
+    assert_raise(Math::DomainError) {BigMath.log(BigDecimal("0"), 10)}
+    assert_raise(Math::DomainError) {BigMath.log(BigDecimal("-1"), 10)}
+    assert_separately(%w[-rbigdecimal], <<-SRC)
+    begin
+      x = BigMath.log(BigDecimal("1E19999999999999"), 10)
+    rescue FloatDomainError
+    else
+      unless x.infinite?
+        assert_in_epsilon(Math.log(10)*19999999999999, x)
+      end
+    end
+    SRC
+  end
+end
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