FYI: New StrictMath.tanh test

[Carsten Neumann <cn-develop at gmx dot net>]

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Added a test for the tanh function.

	Cheers,
		Carsten

2006-08-02  Carsten Neumann  <cn-develop@gmx.net>

	* gnu/testlet/java/lang/StrictMath/tanh.java: New test.
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Index: gnu/testlet/java/lang/StrictMath/tanh.java
===================================================================
RCS file: gnu/testlet/java/lang/StrictMath/tanh.java
diff -N gnu/testlet/java/lang/StrictMath/tanh.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gnu/testlet/java/lang/StrictMath/tanh.java	2 Aug 2006 18:04:41 -0000
@@ -0,0 +1,116 @@
+// Tags: JDK1.5
+
+//  Copyright (C) 2006 Carsten Neumann <cn-develop@gmx.net>
+
+//  This file is part of Mauve.
+
+//  Mauve is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2, or (at your option)
+//  any later version.
+
+//  Mauve is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+
+//  You should have received a copy of the GNU General Public License
+//  along with Mauve; see the file COPYING.  If not, write to
+//  the Free Software Foundation, 59 Temple Place - Suite 330,
+//  Boston, MA 02111-1307, USA.
+
+package gnu.testlet.java.lang.StrictMath;
+
+import gnu.testlet.Testlet;
+import gnu.testlet.TestHarness;
+
+public class tanh implements Testlet
+{
+  /**
+   * These values are used as arguments to cbrt.
+   * The values are somewhat arbitrary, but ensure that all code paths
+   * are tested.
+   */
+  private static double[] inputValues =
+    {
+      0.0,
+      Double.NaN,
+      Double.POSITIVE_INFINITY,
+      Double.NEGATIVE_INFINITY,
+      2.7755575615628e-16,            // ~ 2^-55
+      -2.7755575615628e-16,           // ~ -2^-55
+      2.5123456789e-16,               // < 2^-55
+      -2.5123456789e-16,              // > -2^-55
+      0.123456789,
+      -0.123456789,
+      0.987654321,
+      -0.987654321,
+      1.0000000000000000123,
+      -1.0000000000000000123,
+      1.123456789,
+      -1.123456789,
+      21.999999999999999876,
+      -21.999999999999999876,
+      22.000000000000000123,
+      -22.000000000000000123,
+      25.987654321,
+      -25.987654321,
+    };
+
+    /**
+   * These values are the expected results, obtained from the RI.
+   */
+  private static double[] outputValues =
+    {
+      0.0,
+      Double.NaN,
+      1.0,
+      -1.0,
+      2.7755575615627996E-16,
+      -2.7755575615627996E-16,
+      2.5123456789E-16,
+      -2.5123456789E-16,
+      0.12283336405919822,
+      -0.12283336405919822,
+      0.7563603430619676,
+      -0.7563603430619676,
+      0.7615941559557649,
+      -0.7615941559557649,
+      0.8087679479619252,
+      -0.8087679479619252,
+      1.0,
+      -1.0,
+      1.0,
+      -1.0,
+      1.0,
+      -1.0,
+    };
+
+  public void test(TestHarness harness)
+  {
+    double res;
+
+    for (int i = 0; i < inputValues.length; ++i)
+      {
+	res = StrictMath.tanh(inputValues[i]);
+
+	// exact equality seems appropriate for StrictMath
+	harness.check(res, outputValues[i]);
+      }
+  }
+
+  /**
+   * Run this on the RI to obtain the expected output values.
+   */
+  public static void main(String[] argv)
+  {
+    double res;
+
+    for (int i = 0; i < inputValues.length; ++i)
+      {
+	res = StrictMath.tanh(inputValues[i]);
+
+	System.out.println(Double.toString(res));
+      }
+  }
+}