Use do_run_from_file() for test_i64_double

tests/core/test_i64_double.in

@@ -0,0 +1,38 @@
+
+        #include <stdio.h>
+
+        typedef long long int64;
+        #define JSDOUBLE_HI32_SIGNBIT   0x80000000
+
+        bool JSDOUBLE_IS_NEGZERO(double d)
+        {
+          union {
+            struct {
+              unsigned int lo, hi;
+            } s;
+            double d;
+          } x;
+          if (d != 0)
+            return false;
+          x.d = d;
+          return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
+        }
+
+        bool JSINT64_IS_NEGZERO(int64 l)
+        {
+          union {
+            int64 i;
+            double d;
+          } x;
+          if (l != 0)
+            return false;
+          x.i = l;
+          return x.d == -0;
+        }
+
+        int main(int argc, char * argv[]) {
+          printf("*%d,%d,%d,%d*\n", JSDOUBLE_IS_NEGZERO(0), JSDOUBLE_IS_NEGZERO(-0), JSDOUBLE_IS_NEGZERO(-1), JSDOUBLE_IS_NEGZERO(+1));
+          printf("*%d,%d,%d,%d*\n", JSINT64_IS_NEGZERO(0), JSINT64_IS_NEGZERO(-0), JSINT64_IS_NEGZERO(-1), JSINT64_IS_NEGZERO(+1));
+          return 0;
+        }
+      

tests/core/test_i64_double.out

@@ -0,0 +1,2 @@
+*0,0,0,0*
+*1,1,0,0*

tests/test_core.py

@@ -285,50 +285,13 @@ class T(RunnerCore): # Short name, to make it more fun to use manually on the co
 
       self.do_run_from_file(src, output)
 
-
   def test_i64_double(self):
       if Settings.USE_TYPED_ARRAYS != 2: return self.skip('full i64 stuff only in ta2')
 
+      test_path = path_from_root('tests', 'core', 'test_i64_double')
+      src, output = (test_path + s for s in ('.in', '.out'))
 
-      src = r'''
-        #include <stdio.h>
-
-        typedef long long int64;
-        #define JSDOUBLE_HI32_SIGNBIT   0x80000000
-
-        bool JSDOUBLE_IS_NEGZERO(double d)
-        {
-          union {
-            struct {
-              unsigned int lo, hi;
-            } s;
-            double d;
-          } x;
-          if (d != 0)
-            return false;
-          x.d = d;
-          return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
-        }
-
-        bool JSINT64_IS_NEGZERO(int64 l)
-        {
-          union {
-            int64 i;
-            double d;
-          } x;
-          if (l != 0)
-            return false;
-          x.i = l;
-          return x.d == -0;
-        }
-
-        int main(int argc, char * argv[]) {
-          printf("*%d,%d,%d,%d*\n", JSDOUBLE_IS_NEGZERO(0), JSDOUBLE_IS_NEGZERO(-0), JSDOUBLE_IS_NEGZERO(-1), JSDOUBLE_IS_NEGZERO(+1));
-          printf("*%d,%d,%d,%d*\n", JSINT64_IS_NEGZERO(0), JSINT64_IS_NEGZERO(-0), JSINT64_IS_NEGZERO(-1), JSINT64_IS_NEGZERO(+1));
-          return 0;
-        }
-      '''
-      self.do_run(src, '*0,0,0,0*\n*1,1,0,0*\n') # same as gcc
+      self.do_run_from_file(src, output)
 
   def test_i64_umul(self):
       if Settings.USE_TYPED_ARRAYS != 2: return self.skip('full i64 stuff only in ta2')