Units.b(Clojure): add test cases for extracting methods

Co-authored-by: Masatake YAMATO <[email protected]>

Author: aartaka

Units/parser-clojure.r/clojure-methods.b/README

@@ -0,0 +1,2 @@
+About methodId kind, see #4126.
+

Units/parser-clojure.r/clojure-methods.b/args.ctags

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+--sort=no
+--fields=+KzZ

Units/parser-clojure.r/clojure-methods.b/expected.tags

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+multimethod.test	input.clj	/^(ns multimethod.test)$/;"	kind:namespace
+test	input.clj	/^(defmulti test$/;"	kind:multi	scope:namespace:multimethod.test
+documented-multimethod	input.clj	/^(defmulti documented-multimethod "Documentation"$/;"	kind:multi	scope:namespace:multimethod.test
+test	input.clj	/^(defmethod test nil$/;"	kind:method	scope:namespace:multimethod.test
+test	input.clj	/^(defmethod test :test$/;"	kind:method	scope:namespace:multimethod.test
+test	input.clj	/^(defmethod test :test2 named-method$/;"	kind:method	scope:namespace:multimethod.test
+named-method	input.clj	/^(defmethod test :test2 named-method$/;"	kind:methodId	method:test	scope:namespace:multimethod.test

Units/parser-clojure.r/clojure-methods.b/input.clj

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+(ns multimethod.test)
+
+(defmulti test
+  (fn [type] type))
+
+(defmulti documented-multimethod "Documentation"
+  (fn [type] type))
+
+(defmethod test nil
+  [& _]
+  nil)
+
+(defmethod test :test
+  [& _]
+  nil)
+
+(defmethod test :test2 named-method
+  [& _]
+  nil)