Add unit test for minified d3.call().

Makefile

@@ -136,6 +136,7 @@ d3.geom.js: \
 tests: \
 	tests/test-append.test \
 	tests/test-attr.test \
+	tests/test-call.test \
 	tests/test-format.test \
 	tests/test-transition.test \
 	tests/test-scale-linear.test

tests/test-call.js

@@ -0,0 +1,11 @@
+require("./../lib/env-js/envjs/node");
+require("./../lib/sizzle/sizzle");
+require("./../d3.min");
+
+var vis = d3.select("body").append('svg:svg');
+
+console.log("simple:");
+vis.call(function(a, b) {
+  console.log("  ", b);
+}, "test");
+console.log("");

tests/test-call.out

@@ -0,0 +1,3 @@
+simple:
+   test
+