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R8244/node_modules/resolve/test/node-modules-paths.js
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node-modules-paths.js
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			var test = require('tape');
			var path = require('path');
			var parse = path.parse \|\| require('path-parse');
			var keys = require('object-keys');

			var nodeModulesPaths = require('../lib/node-modules-paths');

			var verifyDirs = function verifyDirs(t, start, dirs, moduleDirectories, paths) {
			var moduleDirs = [].concat(moduleDirectories \|\| 'node_modules');

			var foundModuleDirs = {};
			var uniqueDirs = {};
			var parsedDirs = {};
			for (var i = 0; i < dirs.length; ++i) {
			var parsed = parse(dirs[i]);
			if (!foundModuleDirs[parsed.base]) { foundModuleDirs[parsed.base] = 0; }
			foundModuleDirs[parsed.base] += 1;
			parsedDirs[parsed.dir] = true;
			uniqueDirs[dirs[i]] = true;
			}
			t.equal(keys(parsedDirs).length >= start.split(path.sep).length, true, 'there are >= dirs than "start" has');
			var foundModuleDirNames = keys(foundModuleDirs);
			t.deepEqual(foundModuleDirNames, moduleDirs.concat(paths \|\| []), 'all desired module dirs were found');
			t.equal(keys(uniqueDirs).length, dirs.length, 'all dirs provided were unique');

			var counts = {};
			for (var j = 0; j < foundModuleDirNames.length; ++j) {
			counts[foundModuleDirs[j]] = true;
			}
			t.equal(keys(counts).length, 1, 'all found module directories had the same count');
			};

			test('node-modules-paths', function (t) {
			t.test('no options', function (t) {
			var start = path.join(__dirname, 'resolver');
			var dirs = nodeModulesPaths(start);

			verifyDirs(t, start, dirs);

			t.end();
			});

			t.test('empty options', function (t) {
			var start = path.join(__dirname, 'resolver');
			var dirs = nodeModulesPaths(start, {});

			verifyDirs(t, start, dirs);

			t.end();
			});

			t.test('with paths option', function (t) {
			var start = path.join(__dirname, 'resolver');
			var paths = ['a', 'b'];
			var dirs = nodeModulesPaths(start, { paths: paths });

			verifyDirs(t, start, dirs, null, paths);

			t.end();
			});

			t.test('with moduleDirectory option', function (t) {
			var start = path.join(__dirname, 'resolver');
			var moduleDirectory = 'not node modules';
			var dirs = nodeModulesPaths(start, { moduleDirectory: moduleDirectory });

			verifyDirs(t, start, dirs, moduleDirectory);

			t.end();
			});

			t.test('with 1 moduleDirectory and paths options', function (t) {
			var start = path.join(__dirname, 'resolver');
			var paths = ['a', 'b'];
			var moduleDirectory = 'not node modules';
			var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectory });

			verifyDirs(t, start, dirs, moduleDirectory, paths);

			t.end();
			});

			t.test('with 1+ moduleDirectory and paths options', function (t) {
			var start = path.join(__dirname, 'resolver');
			var paths = ['a', 'b'];
			var moduleDirectories = ['not node modules', 'other modules'];
			var dirs = nodeModulesPaths(start, { paths: paths, moduleDirectory: moduleDirectories });

			verifyDirs(t, start, dirs, moduleDirectories, paths);

			t.end();
			});
			});