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app/node_modules/binary/test/negbs.js

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+var binary = require('../');
+var test = require('tap').test;
+
+test('negbs', function (t) {
+    t.plan(4);
+    // note: can't store -12667700813876161 exactly in an ieee float
+    
+    var buf = new Buffer([
+        226, // a == -30
+        246, 219, // b == -2341
+        255, 243, 245, 236, // c == -789012
+        255, 210, 254, 203, 16, 222, 52, 63, // d == -12667700813876161
+    ]);
+    
+    binary.parse(buf)
+        .word8bs('a')
+        .word16bs('b')
+        .word32bs('c')
+        .word64bs('d')
+        .tap(function (vars) {
+            t.same(vars.a, -30);
+            t.same(vars.b, -2341);
+            t.same(vars.c, -789012);
+            t.ok(
+                Math.abs(vars.d - -12667700813876161) < 1500
+            );
+        })
+    ;
+});