Skip math test in case that Math isn't implemented

test/t/math.rb

 ##
 # Math Test
 
-assert('Math.sin 0') do
+if MathEnabled
+  assert('Math.sin 0') do
     check_float(Math.sin(0), 0)
-end
+  end
 
-assert('Math.sin PI/2') do
+  assert('Math.sin PI/2') do
     check_float(Math.sin(Math::PI / 2), 1)
-end
-
+  end
 
-assert('Fundamental trig identities') do
+  assert('Fundamental trig identities') do
     result = true
     N = 15
     N.times do |i|
@@ -26,57 +26,57 @@ assert('Fundamental trig identities') do
       result &= check_float((1/t) ** 2 + 1, (1/s) ** 2)
     end
     result
-end
+  end
 
-assert('Math.erf 0') do
+  assert('Math.erf 0') do
     check_float(Math.erf(0), 0)
-end
+  end
 
-assert('Math.exp 0') do
+  assert('Math.exp 0') do
     check_float(Math.exp(0), 1.0)
-end
+  end
 
-assert('Math.exp 1') do
+  assert('Math.exp 1') do
     check_float(Math.exp(1), 2.718281828459045)
-end
+  end
 
-assert('Math.exp 1.5') do
+  assert('Math.exp 1.5') do
     check_float(Math.exp(1.5), 4.4816890703380645)
-end
+  end
 
-assert('Math.log 1') do
+  assert('Math.log 1') do
     check_float(Math.log(1), 0)
-end
+  end
 
-assert('Math.log E') do
+  assert('Math.log E') do
     check_float(Math.log(Math::E), 1.0)
-end
+  end
 
-assert('Math.log E**3') do
+  assert('Math.log E**3') do
     check_float(Math.log(Math::E**3), 3.0)
-end
+  end
 
-assert('Math.log2 1') do
+  assert('Math.log2 1') do
     check_float(Math.log2(1), 0.0)
-end
+  end
 
-assert('Math.log2 2') do
+  assert('Math.log2 2') do
     check_float(Math.log2(2), 1.0)
-end
+  end
 
-assert('Math.log10 1') do
+  assert('Math.log10 1') do
     check_float(Math.log10(1), 0.0)
-end
+  end
 
-assert('Math.log10 10') do
+  assert('Math.log10 10') do
     check_float(Math.log10(10), 1.0)
-end
+  end
 
-assert('Math.log10 10**100') do
+  assert('Math.log10 10**100') do
     check_float(Math.log10(10**100), 100.0)
-end
+  end
 
-assert('Math.sqrt') do
+  assert('Math.sqrt') do
     num = [0.0, 1.0, 2.0, 3.0, 4.0]
     sqr = [0, 1, 4, 9, 16]
     result = true
@@ -84,9 +84,9 @@ assert('Math.sqrt') do
       result &= check_float(Math.sqrt(v), num[i])
     end
     result
-end
+  end
 
-assert('Math.cbrt') do
+  assert('Math.cbrt') do
     num = [-2.0, -1.0, 0.0, 1.0, 2.0]
     cub = [-8, -1, 0, 1, 8]
     result = true
@@ -94,22 +94,24 @@ assert('Math.cbrt') do
       result &= check_float(Math.cbrt(v), num[i])
     end
     result
-end
+  end
 
-assert('Math.hypot') do
+  assert('Math.hypot') do
     check_float(Math.hypot(3, 4), 5.0)
-end
+  end
 
-assert('Math.frexp 1234') do
+  assert('Math.frexp 1234') do
     n = 1234
     fraction, exponent = Math.frexp(n)
     check_float(Math.ldexp(fraction, exponent), n)
-end
+  end
 
-assert('Math.erf 1') do
+  assert('Math.erf 1') do
     check_float(Math.erf(1), 0.842700792949715)
-end
+  end
 
-assert('Math.erfc 1') do
+  assert('Math.erfc 1') do
     check_float(Math.erfc(1), 0.157299207050285)
+  end
 end
+