Create trim_characters.test.ts

Author: Mqxx

src/format/trim_characters.test.ts

@@ -0,0 +1,77 @@
+import { assertEquals } from "https://deno.land/std@0.203.0/assert/assert_equals.ts";
+import trimCharacters from "./trim_characters.ts";
+
+Deno.test(
+    'Trim characters at the start of a string.',
+    async (test) => {
+        await test.step({
+            name: 'Empty input string, empty characters',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('', ''),
+                    ''
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Empty characters',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('abc123', ''),
+                    'abc123'
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Empty input string',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('', 'abc'),
+                    ''
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Fake Escaped characters in input string',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('\aabc123\a', '\a'),
+                    'bc123'
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Real Escaped characters in input string',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('\ttabc123t\t', '\t'),
+                    'tabc123'
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Skip characters in input string',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('321abc123', '1'),
+                    '321abc123'
+                )
+            }
+        })
+
+        await test.step({
+            name: 'Normal trim',
+            fn: () => {
+                assertEquals(
+                    trimCharacters('abc123', 'cab23'),
+                    '1'
+                )
+            }
+        })
+    }
+)