Merge #179

179: Add test for `filter` paramter with spaces r=brunoocasali a=ShakyaCsun

# Pull Request

## What does this PR do?
Fixes #96 
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## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

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Co-authored-by: Srishan Shakya <[email protected]>

Author: bors[bot]

test/search_test.dart

@@ -91,6 +91,19 @@ void main() {
         expect(result.hits, hasLength(1));
       });
 
+      test('filter parameter with spaces', () async {
+        var index = await createBooksIndex();
+        var response = await index
+            .updateSettings(IndexSettings(
+              filterableAttributes: ['tag'],
+            ))
+            .waitFor();
+        expect(response.status, 'succeeded');
+        var result =
+            await index.search('prince', filter: 'tag = "Epic fantasy"');
+        expect(result.hits, hasLength(1));
+      });
+
       test('filter parameter with number', () async {
         var index = await createBooksIndex();
         var response = await index