Fix up assertions to be less string-oriented.

LambdaLab/test/solutions/C_DefaultMethods.java

@@ -62,7 +62,7 @@ public class C_DefaultMethods {
         // list.removeIf(s -> (s.length() % 2) != 0);
         //ENDREMOVE
 
-        assertEquals("[alfa, echo]", list.toString());
+        assertEquals(Arrays.asList("alfa", "echo"), list);
     }
     // Hint:
     // <editor-fold defaultstate="collapsed">
@@ -85,7 +85,8 @@ public class C_DefaultMethods {
         // list.replaceAll(s -> s.toUpperCase());
         //ENDREMOVE
 
-        assertEquals("[ALFA, BRAVO, CHARLIE, DELTA, ECHO, FOXTROT]", list.toString());
+        assertEquals(Arrays.asList("ALFA", "BRAVO", "CHARLIE", "DELTA", "ECHO", "FOXTROT"),
+                     list);
     }
     // Hint:
     // <editor-fold defaultstate="collapsed">
@@ -109,7 +110,11 @@ public class C_DefaultMethods {
         map.forEach((k, v) -> v.append(k));
         //ENDREMOVE
 
-        assertEquals("{1=alfa1, 2=bravo2, 3=charlie3}", map.toString());
+        assertEquals(3, map.size());
+        assertTrue(map.values().stream().allMatch(x -> x instanceof StringBuilder));
+        assertEquals("alfa1",    map.get(1).toString());
+        assertEquals("bravo2",   map.get(2).toString());
+        assertEquals("charlie3", map.get(3).toString());
     }
     // Hint:
     // <editor-fold defaultstate="collapsed">
@@ -166,8 +171,8 @@ public class C_DefaultMethods {
         //ENDREMOVE
 
         assertEquals(Arrays.asList('a', 'b', 'c'), new ArrayList<>(result.keySet()));
-        assertEquals("aardvark:alligator:avocet", result.get('a'));
-        assertEquals("bison:bushbaby:bustard", result.get('b'));
+        assertEquals("aardvark:alligator:avocet",    result.get('a'));
+        assertEquals("bison:bushbaby:bustard",       result.get('b'));
         assertEquals("capybara:chimpanzee:capuchin", result.get('c'));
     }
     // Hint:

LambdaLab/test/solutions/D_SimpleStreams.java

@@ -50,7 +50,7 @@ public class D_SimpleStreams {
             // Instead of String::toUpperCase, use w -> w.toUpperCase()
         //ENDREMOVE
 
-        assertEquals("[BRAVO, CHARLIE, DELTA, FOXTROT]", result.toString());
+        assertEquals(Arrays.asList("BRAVO", "CHARLIE", "DELTA", "FOXTROT"), result);
     }
     // Hint 1:
     // <editor-fold defaultstate="collapsed">
@@ -201,7 +201,7 @@ public class D_SimpleStreams {
                                    .collect(Collectors.toList());
         //ENDREMOVE
 
-        assertEquals("[charlie, foxtrot]", result.toString());
+        assertEquals(Arrays.asList("charlie", "foxtrot"), result);
     }
     // Hint:
     // <editor-fold defaultstate="collapsed">