Increase the coverage a bit

Author: swtwsk

src/test/java/com/getindata/connectors/http/internal/ComposeHeaderPreprocessorTest.java

@@ -0,0 +1,21 @@
+package com.getindata.connectors.http.internal;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class ComposeHeaderPreprocessorTest {
+    @ParameterizedTest
+    @CsvSource({
+        "a, a",
+        "a123, a123",
+        "user:password, user:password",
+        "Basic dXNlcjpwYXNzd29yZA==, Basic dXNlcjpwYXNzd29yZA=="
+    })
+    public void testNoPreprocessors(String rawValue, String expectedValue) {
+        var noPreprocessorHeaderPreprocessor = new ComposeHeaderPreprocessor(null);
+        var obtainedValue = noPreprocessorHeaderPreprocessor
+            .preprocessValueForHeader("someHeader", rawValue);
+        assertThat(obtainedValue).isEqualTo(expectedValue);
+    }
+}