Refs #13872 Fix unit test for DimensionBuilder

Framework/Geometry/test/MDHistoDimensionBuilderTest.h

@@ -74,7 +74,8 @@ public:
     TS_ASSERT_THROWS_NOTHING(product = builder.create());
     TS_ASSERT_EQUALS("testDimName", product->getName());
     TS_ASSERT_EQUALS("testDimId", product->getDimensionId());
-    TS_ASSERT_EQUALS("A^-1", product->getUnits().ascii());
+    Mantid::Kernel::InverseAngstromsUnit expectedUnit;
+    TS_ASSERT_EQUALS(expectedUnit.getUnitLabel(), product->getUnits().ascii());
     TS_ASSERT_EQUALS(0, product->getMinimum());
     TS_ASSERT_EQUALS(2, product->getMaximum());
     TS_ASSERT_EQUALS(1, product->getNBins());