Completed HL7Parser coverage

rs-e2e/src/main/java/gov/hhs/cdc/trustedintermediary/rse2e/hl7/HL7Parser.java

@@ -81,10 +81,7 @@ public static Map<String, Character> getEncodingCharacterMap(String encodingChar
 
         return Map.of(
                 FIELD_DELIMITER_NAME, HL7Parser.DEFAULT_FIELD_DELIMITER,
-                COMPONENT_DELIMITER_NAME,
-                        encodingCharacters.length > 0
-                                ? encodingCharacters[0]
-                                : HL7Parser.DEFAULT_COMPONENT_DELIMITER,
+                COMPONENT_DELIMITER_NAME, HL7Parser.DEFAULT_COMPONENT_DELIMITER,
                 REPETITION_DELIMITER_NAME,
                         encodingCharacters.length > 1
                                 ? encodingCharacters[1]

rs-e2e/src/test/groovy/gov/hhs/cdc/trustedintermediary/rse2e/hl7/HL7ParserTest.groovy

@@ -71,4 +71,36 @@ OBX|1|ST|57723-9^Unique bar code number of Current sample^LN||123456||||||F|||20
         then:
         out == null
     }
+
+    def "getEncodingCharacterMap uses default definitions when encoding characters are not available"() {
+        when:
+        def out = HL7Parser.getEncodingCharacterMap("tes")
+
+        then:
+        out.size() > 0
+    }
+
+    def "getEncodingCharacterMap uses default definitions if the encoding characters are blank"() {
+        when:
+        def out = HL7Parser.getEncodingCharacterMap(" ")
+
+        then:
+        out.size() > 0
+    }
+
+    def "getEncodingCharacterMap uses default definitions if the encoding characters are whitespace"() {
+        when:
+        def out = HL7Parser.getEncodingCharacterMap("")
+
+        then:
+        out.size() > 0
+    }
+
+    def "getEncodingCharacterMap uses default definitions if the encoding characters are null"() {
+        when:
+        def out = HL7Parser.getEncodingCharacterMap(null)
+
+        then:
+        out.size() > 0
+    }
 }