add test case

test/configCases/context-exclusion/simple/index.js

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+function requireInContext(someVariable) {
+	return require(`./some-dir/${someVariable}`);
+}
+
+it("should not exclude paths not matching the exclusion pattern", function() {
+	requireInContext("file").should.be.eql("thats good");
+	requireInContext("check-here/file").should.be.eql("thats good");
+	requireInContext("check-here/check-here/file").should.be.eql("thats good");
+});
+
+it("should exclude paths/files matching the exclusion pattern", function() {
+		(() => requireInContext("dont")).
+			should.throw(/Cannot find module '.\/dont'/);
+
+		(() => requireInContext("dont-check-here/file")).
+			should.throw(/Cannot find module '.\/dont-check-here\/file'/);
+
+		(() => requireInContext("check-here/dont-check-here/file")).
+			should.throw(/Cannot find module '.\/check-here\/dont-check-here\/file'/);
+});

test/configCases/context-exclusion/simple/some-dir/check-here/check-here/file.js

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+module.exports = "thats good";

test/configCases/context-exclusion/simple/some-dir/check-here/dont-check-here/file.js

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+module.exports = "thats bad";

test/configCases/context-exclusion/simple/some-dir/check-here/file.js

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+module.exports = "thats good";

test/configCases/context-exclusion/simple/some-dir/dont-check-here/file.js

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+module.exports = "thats bad";

test/configCases/context-exclusion/simple/some-dir/dont.js

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+module.exports = "thats bad";

test/configCases/context-exclusion/simple/some-dir/file.js

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+module.exports = "thats good";

test/configCases/context-exclusion/simple/webpack.config.js

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+var webpack = require("../../../../");
+
+module.exports = {
+	plugins: [
+		new webpack.ContextExclusionPlugin(/dont/)
+	]
+};