feat: Add mutators for lowercase/uppercase expanding strings

src/main/java/com/endava/cats/fuzzer/special/mutators/impl/LowercaseExpandingBytesMutator.java

@@ -0,0 +1,22 @@
+package com.endava.cats.fuzzer.special.mutators.impl;
+
+import com.endava.cats.fuzzer.special.mutators.api.BodyMutator;
+import com.endava.cats.generator.simple.UnicodeGenerator;
+import com.endava.cats.util.CatsUtil;
+import com.endava.cats.util.JsonUtils;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class LowercaseExpandingBytesMutator implements BodyMutator {
+    @Override
+    public String mutate(String inputJson, String selectedField) {
+        int length = String.valueOf(JsonUtils.getVariableFromJson(inputJson, selectedField)).length();
+        String generated = CatsUtil.selectRandom(UnicodeGenerator.getLowercaseExpandingBytes(), length);
+        return CatsUtil.justReplaceField(inputJson, selectedField, generated).json();
+    }
+
+    @Override
+    public String description() {
+        return "replace field with strings that expand bytes when lowercased";
+    }
+}

src/main/java/com/endava/cats/fuzzer/special/mutators/impl/LowercaseExpandingLengthMutator.java

@@ -0,0 +1,22 @@
+package com.endava.cats.fuzzer.special.mutators.impl;
+
+import com.endava.cats.fuzzer.special.mutators.api.BodyMutator;
+import com.endava.cats.generator.simple.UnicodeGenerator;
+import com.endava.cats.util.CatsUtil;
+import com.endava.cats.util.JsonUtils;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class LowercaseExpandingLengthMutator implements BodyMutator {
+    @Override
+    public String mutate(String inputJson, String selectedField) {
+        int length = String.valueOf(JsonUtils.getVariableFromJson(inputJson, selectedField)).length();
+        String generated = CatsUtil.selectRandom(UnicodeGenerator.getLowercaseExpandingLength(), length);
+        return CatsUtil.justReplaceField(inputJson, selectedField, generated).json();
+    }
+
+    @Override
+    public String description() {
+        return "replace field with strings that expand length when lowercased";
+    }
+}

src/main/java/com/endava/cats/fuzzer/special/mutators/impl/UppercaseExpandingBytesMutator.java

@@ -0,0 +1,22 @@
+package com.endava.cats.fuzzer.special.mutators.impl;
+
+import com.endava.cats.fuzzer.special.mutators.api.BodyMutator;
+import com.endava.cats.generator.simple.UnicodeGenerator;
+import com.endava.cats.util.CatsUtil;
+import com.endava.cats.util.JsonUtils;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class UppercaseExpandingBytesMutator implements BodyMutator {
+    @Override
+    public String mutate(String inputJson, String selectedField) {
+        int length = String.valueOf(JsonUtils.getVariableFromJson(inputJson, selectedField)).length();
+        String generated = CatsUtil.selectRandom(UnicodeGenerator.getUppercaseExpandingBytes(), length);
+        return CatsUtil.justReplaceField(inputJson, selectedField, generated).json();
+    }
+
+    @Override
+    public String description() {
+        return "replace field with strings that expand bytes when uppercased";
+    }
+}

src/main/java/com/endava/cats/fuzzer/special/mutators/impl/UppercaseExpandingLengthMutator.java

@@ -0,0 +1,22 @@
+package com.endava.cats.fuzzer.special.mutators.impl;
+
+import com.endava.cats.fuzzer.special.mutators.api.BodyMutator;
+import com.endava.cats.generator.simple.UnicodeGenerator;
+import com.endava.cats.util.CatsUtil;
+import com.endava.cats.util.JsonUtils;
+import jakarta.inject.Singleton;
+
+@Singleton
+public class UppercaseExpandingLengthMutator implements BodyMutator {
+    @Override
+    public String mutate(String inputJson, String selectedField) {
+        int length = String.valueOf(JsonUtils.getVariableFromJson(inputJson, selectedField)).length();
+        String generated = CatsUtil.selectRandom(UnicodeGenerator.getUppercaseExpandingLength(), length);
+        return CatsUtil.justReplaceField(inputJson, selectedField, generated).json();
+    }
+
+    @Override
+    public String description() {
+        return "replace field with strings that expand length when uppercased";
+    }
+}