Add dropna test

src/panthera/pandas/reshape.clj

@@ -718,12 +718,13 @@
   ```
   "
   [df-or-srs & [{:keys [com span halflife min-periods adjust ignore-na axis]
-                 :as attrs}]]
+                 :as   attrs}]]
   (u/simple-kw-call df-or-srs "ewm" attrs))
 
-; remove :inplace as an attr
 (defn dropna
-  [df-or-srs & [attrs]]
+  "Drop missing values"
+  [df-or-srs & [{:keys [axis how thresh subset]
+                 :as   attrs}]]
   (u/simple-kw-call df-or-srs "dropna" attrs))
 
 (defn melt

test/panthera/reshape_test.clj

@@ -374,3 +374,29 @@
                                 {:b 1.6153846153846152}
                                 {:b 1.6153846153846152}
                                 {:b 3.2249999999999996}]))
+
+(deftest dropna
+  (are [s o d]
+      (m/same?
+        (-> (g/series s)
+          r/dropna)
+        (g/series o d))
+    []        []        {}
+    [1 nil 2] [1.0 2.0] {:index [0 2]})
+
+  (are [att out opt]
+      (m/same?
+        (-> (g/data-frame {:name ["Alfred" "Batman" "Robin"]
+                           :toy  [nil "Batmobile" "Whip"]
+                           :born [nil "1940-04-25" nil]})
+          (r/dropna att))
+        (g/data-frame out opt))
+    {} [{:name "Batman", :toy "Batmobile", :born "1940-04-25"}] {:index [1]}
+    {:axis 1} [{:name "Alfred"} {:name "Batman"} {:name "Robin"}] {}
+    {:how :all} [{:name "Alfred", :toy nil, :born nil}
+                 {:name "Batman", :toy "Batmobile", :born "1940-04-25"}
+                 {:name "Robin", :toy "Whip", :born nil}] {}
+    {:thresh 2} [{:name "Batman", :toy "Batmobile", :born "1940-04-25"}
+                 {:name "Robin", :toy "Whip", :born nil}] {:index [1 2]}
+    {:subset [:toy]} [{:name "Batman", :toy "Batmobile", :born "1940-04-25"}
+                      {:name "Robin", :toy "Whip", :born nil}] {:index [1 2]}))