Add test support classes for passive package

- Add TestTrackableValue implementation with Jackson support
- Add AnotherTestTrackableValue for mixed type testing
- Add TestState class for StatExtractor testing
- Add TestStatExtractor concrete implementation

Author: ic0ns

src/test/java/de/rub/nds/scanner/core/passive/AnotherTestTrackableValue.java

@@ -0,0 +1,44 @@
+/*
+ * Scanner Core - A Modular Framework for Probe Definition, Execution, and Result Analysis.
+ *
+ * Copyright 2017-2023 Ruhr University Bochum, Paderborn University, Technology Innovation Institute, and Hackmanit GmbH
+ *
+ * Licensed under Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0.txt
+ */
+package de.rub.nds.scanner.core.passive;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.Objects;
+
+public class AnotherTestTrackableValue implements TrackableValue {
+    private final int number;
+
+    @JsonCreator
+    public AnotherTestTrackableValue(@JsonProperty("number") int number) {
+        this.number = number;
+    }
+
+    public int getNumber() {
+        return number;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        AnotherTestTrackableValue that = (AnotherTestTrackableValue) o;
+        return number == that.number;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(number);
+    }
+
+    @Override
+    public String toString() {
+        return "AnotherTestTrackableValue{" + "number=" + number + '}';
+    }
+}

src/test/java/de/rub/nds/scanner/core/passive/TestStatExtractor.java

@@ -0,0 +1,31 @@
+/*
+ * Scanner Core - A Modular Framework for Probe Definition, Execution, and Result Analysis.
+ *
+ * Copyright 2017-2023 Ruhr University Bochum, Paderborn University, Technology Innovation Institute, and Hackmanit GmbH
+ *
+ * Licensed under Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0.txt
+ */
+package de.rub.nds.scanner.core.passive;
+
+public class TestStatExtractor extends StatExtractor<TestState, TestTrackableValue> {
+
+    private boolean shouldExtractNull = false;
+
+    public TestStatExtractor() {
+        super(new TestTrackableValue("type"));
+    }
+
+    public void setShouldExtractNull(boolean shouldExtractNull) {
+        this.shouldExtractNull = shouldExtractNull;
+    }
+
+    @Override
+    public void extract(TestState state) {
+        if (shouldExtractNull) {
+            put(null);
+        } else if (state != null && state.getValue() != null) {
+            put(new TestTrackableValue(state.getValue()));
+        }
+    }
+}

src/test/java/de/rub/nds/scanner/core/passive/TestState.java

@@ -0,0 +1,21 @@
+/*
+ * Scanner Core - A Modular Framework for Probe Definition, Execution, and Result Analysis.
+ *
+ * Copyright 2017-2023 Ruhr University Bochum, Paderborn University, Technology Innovation Institute, and Hackmanit GmbH
+ *
+ * Licensed under Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0.txt
+ */
+package de.rub.nds.scanner.core.passive;
+
+public class TestState {
+    private final String value;
+
+    public TestState(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+}

src/test/java/de/rub/nds/scanner/core/passive/TestTrackableValue.java

@@ -0,0 +1,44 @@
+/*
+ * Scanner Core - A Modular Framework for Probe Definition, Execution, and Result Analysis.
+ *
+ * Copyright 2017-2023 Ruhr University Bochum, Paderborn University, Technology Innovation Institute, and Hackmanit GmbH
+ *
+ * Licensed under Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0.txt
+ */
+package de.rub.nds.scanner.core.passive;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.Objects;
+
+public class TestTrackableValue implements TrackableValue {
+    private final String value;
+
+    @JsonCreator
+    public TestTrackableValue(@JsonProperty("value") String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        TestTrackableValue that = (TestTrackableValue) o;
+        return Objects.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value);
+    }
+
+    @Override
+    public String toString() {
+        return "TestTrackableValue{" + "value='" + value + '\'' + '}';
+    }
+}