Merge pull request #158 from pbosetti/tests

Minor edits to test suite and Math module

2 files changed, 25 insertions, 10 deletions

diff --git a/test/assert.rb b/test/assert.rb
index afc39fc24..54b50138e 100644
--- a/test/assert.rb
+++ b/test/assert.rb
@@ -22,7 +22,7 @@ end
 # iso : The ISO reference code of the feature
 #       which will be tested by this
 #       assertion
-def assert(str = 'Assertion failed', iso = '')
+def assert(str = 'Assertion failed', iso = 'No ISO')
   begin
     if(!yield)
       $asserts.push([str, iso])
diff --git a/test/t/math.rb b/test/t/math.rb
index 0f42e7d49..a9c7e7fb7 100644
--- a/test/t/math.rb
+++ b/test/t/math.rb
@@ -1,18 +1,19 @@
 ##
 # Math Test
 
-MATH_TOLERANCE = 1E-12
+##
+# Performs fuzzy check for equality on methods returning floats
+# on the basis of the Math::TOLERANCE constant.
 def check(a,b)
   a = a.to_f
   b = b.to_f
   if a.finite? and b.finite?
-    (a-b).abs < MATH_TOLERANCE
+    (a-b).abs < Math::TOLERANCE
   else
     true
   end
 end
 
-
 assert('Math.sin 0') do
   check(Math.sin(0), 0)
 end
@@ -26,12 +27,13 @@ assert('Fundamental trig identities') do
   result = true
   N = 15
   N.times do |i|
-    a = Math::PI / N * i
-    s = Math.sin(a)
-    c = Math.cos(a)
-    t = Math.tan(a)
-    result &= check(s, Math.cos(Math::PI / 2 - a))
-    result &= check(t, 1 / Math.tan(Math::PI / 2 - a))
+    a  = Math::PI / N * i
+    ca = Math::PI / 2 - a
+    s  = Math.sin(a)
+    c  = Math.cos(a)
+    t  = Math.tan(a)
+    result &= check(s, Math.cos(ca))
+    result &= check(t, 1 / Math.tan(ca))
     result &= check(s ** 2 + c ** 2, 1)
     result &= check(t ** 2 + 1, (1/c) ** 2)
     result &= check((1/t) ** 2 + 1, (1/s) ** 2)
@@ -101,3 +103,16 @@ assert('Math.hypot') do
   check(Math.hypot(3, 4), 5.0)
 end
 
+assert('Math.frexp 1234') do
+  n = 1234
+  fraction, exponent = Math.frexp(n)
+  check(Math.ldexp(fraction, exponent), n)
+end
+
+assert('Math.erf 1') do
+  check(Math.erf(1), 0.842700792949715)
+end
+
+assert('Math.erfc 1') do
+  check(Math.erfc(1), 0.157299207050285)
+end