Add tests for getFromUrl and update imports

Added unit tests for getFromUrl to verify correct value extraction and error handling. Updated imports in error classes to use named import for CustomError. Added @std/assert to deno.json imports for testing.

Author: Mqxx

deno.json

@@ -47,5 +47,8 @@
         "no-inferrable-types"
       ]
     }
+  },
+  "imports": {
+    "@std/assert": "jsr:@std/assert@^1.0.15"
   }
 }

deno.lock

@@ -1,4 +1,4 @@
-import CustomError from '../../error/custom_error.ts'
+import { CustomError } from '../../error/custom_error.ts'
 
 /**
  * This class represents a missing URL parameters error. This error is thrown if there is a missing URL parameter.

src/request_url/error/missing_url_parameter_key_error.ts

@@ -1,4 +1,4 @@
-import CustomError from '../../error/custom_error.ts'
+import { CustomError } from '../../error/custom_error.ts'
 
 /**
  * This class represents a missing URL parameters error. This error is thrown if there is a missing URL parameter.

src/request_url/error/missing_url_parameter_value_error.ts

@@ -0,0 +1,19 @@
+import { assertEquals, assertIsError } from '@std/assert'
+import { getFromUrl } from './index.ts';
+import {MissingURLParameterKeyError} from '../error/index.ts';
+
+Deno.test('Test getFromUrl', async (test) => {
+  await test.step({
+    name: 'Test if key gets queried correctly.',
+    fn() : void {
+      assertEquals(getFromUrl('key=value1&key=value2', 'key'), ['value1', 'value2'])
+    }
+  })
+
+  await test.step({
+    name: 'Test if function throws if the key does not exist.',
+    fn() : void {
+      assertIsError(getFromUrl('key=value1&key=value2', 'keyDoesNotExist'), MissingURLParameterKeyError)
+    }
+  })
+})