Add zero-length line test

dr-jts · May 13, 2024 · b427535 · b427535
1 parent 1a79936
commit b427535
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Showing 2 changed files with 15 additions and 3 deletions.
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/package-info.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/package-info.java
@@ -87,8 +87,8 @@
  * and the boundary of a LineString has location <code>Interior</code>.
  * </ul>
  * 
- * <h3>Zero-length Line Handling</h3>
- * Zero-length lines are treated as if they are a Point at the same location. 
+ * <h3>Zero-length LineString Handling</h3>
+ * Zero-length LineStrings are handled as topologically identical to a Point at the same coordinate. 
  *  
  * <h2>Package Specification</h2>
  * <ul>

diff --git a/modules/core/src/test/java/org/locationtech/jts/operation/relateng/RelateNGTest.java b/modules/core/src/test/java/org/locationtech/jts/operation/relateng/RelateNGTest.java
@@ -85,7 +85,7 @@ public void testLinePointOverlaps() {
     checkCoversCoveredBy(b, a, false);
   }
 
-  public void testLinePointZeroLength() {
+  public void testZeroLengthLinePoint() {
     String a = "LINESTRING (0 0, 0 0)";
     String b = "POINT (0 0)";
     checkRelate(a, b, "0FFFFFFF2");
@@ -97,6 +97,18 @@ public void testLinePointZeroLength() {
     checkEquals(a, b, true);
   }
 
+  public void testZeroLengthLineLine() {
+    String a = "LINESTRING (10 10, 10 10, 10 10)";
+    String b = "LINESTRING (10 10, 10 10)";
+    checkRelate(a, b, "0FFFFFFF2");
+    checkIntersectsDisjoint(a, b, true);
+    checkContainsWithin(a, b, true);
+    checkContainsWithin(b, a, true);
+    checkCoversCoveredBy(a, b, true);
+    checkCoversCoveredBy(b, a, true);
+    checkEquals(a, b, true);
+  }
+
   public void testLinePointIntAndExt() {
     String a = "MULTIPOINT((60 60), (100 100))";
     String b = "LINESTRING(40 40, 80 80)";