Update tests strain (#2764)

Author: jagdish-15

exercises/practice/strain/.meta/config.json

@@ -4,6 +4,7 @@
   ],
   "contributors": [
     "ankorGH",
+    "jagdish-15",
     "rchavarria",
     "ryanplusplus",
     "SleeplessByte",

exercises/practice/strain/.meta/tests.toml

@@ -0,0 +1,52 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[26af8c32-ba6a-4eb3-aa0a-ebd8f136e003]
+description = "keep on empty list returns empty list"
+
+[f535cb4d-e99b-472a-bd52-9fa0ffccf454]
+description = "keeps everything"
+
+[950b8e8e-f628-42a8-85e2-9b30f09cde38]
+description = "keeps nothing"
+
+[92694259-6e76-470c-af87-156bdf75018a]
+description = "keeps first and last"
+
+[938f7867-bfc7-449e-a21b-7b00cbb56994]
+description = "keeps neither first nor last"
+
+[8908e351-4437-4d2b-a0f7-770811e48816]
+description = "keeps strings"
+
+[2728036b-102a-4f1e-a3ef-eac6160d876a]
+description = "keeps lists"
+
+[ef16beb9-8d84-451a-996a-14e80607fce6]
+description = "discard on empty list returns empty list"
+
+[2f42f9bc-8e06-4afe-a222-051b5d8cd12a]
+description = "discards everything"
+
+[ca990fdd-08c2-4f95-aa50-e0f5e1d6802b]
+description = "discards nothing"
+
+[71595dae-d283-48ca-a52b-45fa96819d2f]
+description = "discards first and last"
+
+[ae141f79-f86d-4567-b407-919eaca0f3dd]
+description = "discards neither first nor last"
+
+[daf25b36-a59f-4f29-bcfe-302eb4e43609]
+description = "discards strings"
+
+[a38d03f9-95ad-4459-80d1-48e937e4acaf]
+description = "discards lists"

exercises/practice/strain/strain.spec.js

@@ -10,6 +10,10 @@ describe('strain', () => {
     expect(keep([1, 2, 3], (e) => e < 10)).toEqual([1, 2, 3]);
   });
 
+  xtest('keeps nothing', () => {
+    expect(keep([1, 2, 3], (e) => e > 10)).toEqual([]);
+  });
+
   xtest('keeps first and last', () => {
     expect(keep([1, 2, 3], (e) => e % 2 === 1)).toEqual([1, 3]);
   });
@@ -24,7 +28,7 @@ describe('strain', () => {
     expect(result).toEqual('zebra zombies zelot'.split(' '));
   });
 
-  xtest('keeps arrays', () => {
+  xtest('keeps lists', () => {
     const rows = [
       [1, 2, 3],
       [5, 5, 5],
@@ -43,10 +47,14 @@ describe('strain', () => {
     ]);
   });
 
-  xtest('empty discard', () => {
+  xtest('discards everything', () => {
     expect(discard([], (e) => e < 10)).toEqual([]);
   });
 
+  xtest('discards everything', () => {
+    expect(discard([1, 3, 5], (e) => e < 10)).toEqual([]);
+  });
+
   xtest('discards nothing', () => {
     expect(discard([1, 2, 3], (e) => e > 10)).toEqual([1, 2, 3]);
   });
@@ -66,7 +74,7 @@ describe('strain', () => {
     expect(result).toEqual('apple banana cherimoya'.split(' '));
   });
 
-  xtest('discards arrays', () => {
+  xtest('discards lists', () => {
     const rows = [
       [1, 2, 3],
       [5, 5, 5],