Add expectations

Signed-off-by: Nathanael Esayeas <nathanael.esayeas@protonmail.com>

fixtures/empty-fixture-has-no-errors/expectations.json

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+{
+    "errors": []
+}

fixtures/test-something/expectations.json

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+{
+    "errors": [
+        {
+            "file": "code.php",
+            "message": "PHPUnit\\Framework\\Exception is thrown but not caught - please either catch or add a @throws annotation",
+            "severity": "error",
+            "type": "MissingThrowsDocblock"
+        }
+    ]
+}

fixtures/testcase-expect-exception-accepts-throwables/expectations.json

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+{
+    "errors": []
+}

fixtures/testcase-expect-exception-rejects-non-throwables/expectations.json

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+{
+    "errors": [
+        {
+            "file": "code.php",
+            "message": "Argument 1 of Vendor\\Package\\MyTestCase::expectException expects class-string<Throwable>, but Vendor\\Package\\MyTestCase::class provided",
+            "severity": "error",
+            "type": "InvalidArgument"
+        },
+        {
+            "file": "code.php",
+            "message": "Cannot find any calls to method Vendor\\Package\\MyTestCase::testSomething",
+            "severity": "error",
+            "type": "PossiblyUnusedMethod"
+        }
+    ]
+}

fixtures/testcase-with-data-provider-attribute-double-quotes/expectations.json

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+{
+    "errors": []
+}

fixtures/testcase-with-data-provider-attribute-single-quotes/expectations.json

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+{
+    "errors": []
+}

fixtures/testcase-with-data-provider-tag/expectations.json

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+{
+    "errors": []
+}

fixtures/unreferenced-providers-are-marked-as-unused/expectations.json

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+{
+    "errors": []
+}