diff --git a/.gitignore b/.gitignore
index add6044..c1bfe9d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,11 @@ ContributorsCheck/contributors-check/src/main/resources/auth.properties
 .project
 .settings
 */target/*
+target/
 .recommenders
 NullCheck/src/main/resources/auth.properties
 auth.properties
+
+# ItelliJ Files
+.idea/
+release-qa.iml
diff --git a/pom.xml b/pom.xml
index b26a597..98956db 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
     <properties>
         <bundle.symbolicName>reactome-release-qa</bundle.symbolicName>
         <bundle.namespace>org.reactome</bundle.namespace>
-        <!-- Prevent Using platform encoding (UTF-8 actually) to copy filtered 
+        <!-- Prevent Using platform encoding (UTF-8 actually) to copy filtered
             resources, i.e. build is platform dependent! See: https://maven.apache.org/general.html -->
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <opencsv.version>4.2</opencsv.version>
@@ -159,6 +159,19 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest</artifactId>
+            <version>2.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>2.18.3</version>
+            <scope>test</scope>
+        </dependency>
+
         <!-- The CSV parser. -->
         <dependency>
             <groupId>com.opencsv</groupId>
@@ -182,7 +195,7 @@
             <artifactId>log4j-core</artifactId>
             <version>${log4j2.version}</version>
         </dependency>
-        <!-- Log4j2-to-Log4j1.x bridge - just in case something in reactome-base 
+        <!-- Log4j2-to-Log4j1.x bridge - just in case something in reactome-base
             depends on log4j 1.x code. -->
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
@@ -200,8 +213,8 @@
             <groupId>org.reactome.base</groupId>
             <artifactId>reactome-base</artifactId>
             <version>${reactome.base.version}</version>
-            <!-- exclude old log4j 1.x libraries - log4j 1.x has not been 
-                supported for a while ( See: https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces 
+            <!-- exclude old log4j 1.x libraries - log4j 1.x has not been
+                supported for a while ( See: https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces
                 ) -->
             <exclusions>
                 <exclusion>
diff --git a/src/main/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheck.java b/src/main/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheck.java
index 9f5e732..4ce9fa3 100644
--- a/src/main/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheck.java
+++ b/src/main/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheck.java
@@ -5,17 +5,10 @@
 import org.gk.persistence.MySQLAdaptor;
 import org.reactome.release.qa.annotations.ReleaseQACheck;
 import org.reactome.release.qa.common.AbstractQACheck;
-import org.reactome.release.qa.common.QACheckerHelper;
 import org.reactome.release.qa.common.QAReport;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.net.URL;
 import java.util.*;
 import java.util.function.Function;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 /**
@@ -26,7 +19,12 @@
 @ReleaseQACheck
 public class EHLDSubpathwayChangeCheck extends AbstractQACheck implements ChecksTwoDatabases
 {
-	final private String NOT_AVAILABLE = "N/A";
+	private final String NOT_AVAILABLE = "N/A";
+	// Need to create the following value in org/gk/model/ReactomeJavaConstants.java in the Curator Tool project
+	// source code
+	public static final String HAS_EHLD = "hasEHLD";
+
+
 	private MySQLAdaptor olderDatabase;
 
 	@Override
@@ -42,7 +40,7 @@ public QAReport executeQACheck() throws Exception
 			"Subpathway Names removed in " + this.dba.getDBName()
 		);
 
-		List<Long> pathwayIds = new ArrayList<>(getPathwayIDsWithEHLD());
+		List<Long> pathwayIds = new ArrayList<>(getPathwayIDsWithEHLD(this.dba));
 		List<EHLDPathway> oldPathways = getEHLDPathways(pathwayIds, getOtherDBAdaptor());
 		List<EHLDPathway> newPathways = getEHLDPathways(pathwayIds, this.dba);
 
@@ -73,54 +71,28 @@ public QAReport executeQACheck() throws Exception
 	}
 
 	@Override
-	public void setOtherDBAdaptor(MySQLAdaptor olderDatabase)	{ this.olderDatabase = olderDatabase; }
-
-	public MySQLAdaptor getOtherDBAdaptor() { return this.olderDatabase; };
-
-	private List<Long> getPathwayIDsWithEHLD() throws EHLDPathwayIDRetrievalException {
-		final String reactomeEHLDURL = "https://reactome.org/download/current/ehld/";
-		List<Long> pathwayIds = new ArrayList<>();
-		try {
-			BufferedReader ehldWebSource = new BufferedReader(
-				new InputStreamReader(new URL(reactomeEHLDURL).openStream())
-			);
-
-			pathwayIds.addAll(parsePathwayIds(ehldWebSource));
-			pathwayIds.sort(Comparator.comparing(Long::longValue));
-
-			ehldWebSource.close();
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-
-		if (pathwayIds.isEmpty()) {
-			throw new EHLDPathwayIDRetrievalException("Unable to retrieve pathway ids from " + reactomeEHLDURL);
-		}
-
-		return pathwayIds;
+	public void setOtherDBAdaptor(MySQLAdaptor olderDatabase) {
+		this.olderDatabase = olderDatabase;
 	}
 
-	private List<Long> parsePathwayIds(BufferedReader ehldWebSource) throws IOException {
-		List<Long> pathwayIds = new ArrayList<>();
-
-		Pattern svgFileName = getSVGFileNamePattern();
-		String sourceLine;
-		while ((sourceLine = ehldWebSource.readLine()) != null) {
-			Matcher svgMatcher = svgFileName.matcher(sourceLine);
-			if (svgMatcher.find()) {
-				Long pathwayId = Long.parseLong(svgMatcher.group(1));
-				pathwayIds.add(pathwayId);
-			}
-		}
-
-		return pathwayIds;
+	public MySQLAdaptor getOtherDBAdaptor() {
+		return this.olderDatabase;
 	}
 
-	private Pattern getSVGFileNamePattern() {
-		return Pattern.compile("\"(\\d+)\\.svg\"");
+	List<Long> getPathwayIDsWithEHLD(MySQLAdaptor newerDatabase) throws EHLDPathwayIDRetrievalException {
+		try {
+			return asGKInstanceCollection(
+				newerDatabase.fetchInstanceByAttribute(ReactomeJavaConstants.Pathway, HAS_EHLD, "=", true)
+			)
+			.stream()
+			.map(GKInstance::getDBID)
+			.collect(Collectors.toList());
+		} catch (Exception e) {
+			throw new EHLDPathwayIDRetrievalException("Unable to retrieve pathway ids from " + newerDatabase, e);
+		}
 	}
 
-	private List<EHLDPathway> getEHLDPathways(Collection<Long> dbIds, MySQLAdaptor database) {
+	List<EHLDPathway> getEHLDPathways(Collection<Long> dbIds, MySQLAdaptor database) {
 		List<EHLDPathway> ehldPathways = new ArrayList<>();
 		try {
 			ehldPathways.addAll(
@@ -178,13 +150,13 @@ private boolean isPathway(GKInstance instance) {
 		return instance.getSchemClass().isa(ReactomeJavaConstants.Pathway);
 	}
 
-	private class EHLDPathwayIDRetrievalException extends Exception {
-		public EHLDPathwayIDRetrievalException(String retrievalError) {
-			super(retrievalError);
+	private static class EHLDPathwayIDRetrievalException extends Exception {
+		public EHLDPathwayIDRetrievalException(String retrievalError, Throwable cause) {
+			super(retrievalError, cause);
 		}
 	}
 
-	private class EHLDPathway {
+	class EHLDPathway {
 		final private GKInstance pathway;
 		final private List<GKInstance> subPathways;
 		final private Integer reactomeVersion;
diff --git a/src/test/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheckTest.java b/src/test/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheckTest.java
new file mode 100644
index 0000000..69afa9c
--- /dev/null
+++ b/src/test/java/org/reactome/release/qa/check/EHLDSubpathwayChangeCheckTest.java
@@ -0,0 +1,85 @@
+package org.reactome.release.qa.check;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.equalTo;
+import static org.reactome.release.qa.check.EHLDSubpathwayChangeCheck.HAS_EHLD;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import org.gk.model.GKInstance;
+import org.gk.model.ReactomeJavaConstants;
+import org.gk.persistence.MySQLAdaptor;
+import org.gk.schema.SchemaClass;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.reactome.release.qa.check.EHLDSubpathwayChangeCheck.EHLDPathway;
+
+public class EHLDSubpathwayChangeCheckTest {
+	@Mock
+	MySQLAdaptor adaptor;
+
+	@Mock
+	SchemaClass pathwaySchemaClass;
+
+	@Mock
+	GKInstance firstPathway;
+
+	@Mock
+	GKInstance secondPathway;
+
+	private static final long FIRST_PATHWAY_DB_ID = 1L;
+	private static final long SECOND_PATHWAY_DB_ID = 2L;
+
+	@Before
+	public void setUp() {
+		MockitoAnnotations.initMocks(this);
+	}
+
+	@Test
+	public void testGetEHLDPathwayIDs() throws Exception {
+		setUpMockPathways();
+
+		EHLDSubpathwayChangeCheck ehldSubpathwayChangeCheck = new EHLDSubpathwayChangeCheck();
+		List<Long> pathwayIDs = ehldSubpathwayChangeCheck.getPathwayIDsWithEHLD(adaptor);
+
+		assertThat(pathwayIDs, contains(firstPathway.getDBID())); // Contains firstPathway id only
+	}
+
+	@Test
+	public void testGetEHLDSubPathways() throws Exception {
+		setUpMockPathways();
+		Mockito.when(adaptor.fetchInstance((Collection<Long>) Collections.singletonList(FIRST_PATHWAY_DB_ID)))
+			.thenReturn(Collections.singletonList(firstPathway));
+		Mockito.when(firstPathway.getAttributeValuesList(ReactomeJavaConstants.hasEvent))
+			.thenReturn(Collections.singletonList(secondPathway));
+
+		EHLDSubpathwayChangeCheck ehldSubpathwayChangeCheck = new EHLDSubpathwayChangeCheck();
+		EHLDPathway firstEHLDPathway = ehldSubpathwayChangeCheck.getEHLDPathways(
+			Collections.singletonList(FIRST_PATHWAY_DB_ID), adaptor
+		).get(0);
+
+		assertThat(firstEHLDPathway.getPathway(), equalTo(firstPathway));
+		assertThat(firstEHLDPathway.getSubPathways(), contains(secondPathway));
+	}
+
+	private void setUpMockPathways() throws Exception {
+		setUpMockPathway(firstPathway, FIRST_PATHWAY_DB_ID, true);
+		setUpMockPathway(secondPathway, SECOND_PATHWAY_DB_ID, false);
+		Collection<GKInstance> ehldPathways = Arrays.asList(firstPathway);
+
+		Mockito.when(adaptor.fetchInstanceByAttribute(ReactomeJavaConstants.Pathway, HAS_EHLD, "=", true))
+			.thenReturn(ehldPathways);
+	}
+
+	private void setUpMockPathway(GKInstance pathway, long dbId, boolean hasEHLD) throws Exception {
+		Mockito.when(pathway.getSchemClass()).thenReturn(pathwaySchemaClass);
+		Mockito.when(pathwaySchemaClass.isa(ReactomeJavaConstants.Pathway)).thenReturn(true);
+		Mockito.when(pathway.getDBID()).thenReturn(dbId);
+	}
+}