Test case that generates expressions

src/kiss/Kiss.hx

@@ -76,6 +76,7 @@ class Kiss {
                 "count" => Symbol("Lambda.count"),
                 "enumerate" => Symbol("Prelude.enumerate"),
                 "assertProcess" => Symbol("Prelude.assertProcess"),
+                "random" => Symbol("Std.random"),
                 // These work with (apply) because they are added as "opAliases" in Macros.kiss:
                 "min" => Symbol("Prelude.min"),
                 "max" => Symbol("Prelude.max"),
@@ -93,6 +94,8 @@ class Kiss {
                 "<" => Symbol("Prelude.lessThan"),
                 "<=" => Symbol("Prelude.lesserEqual"),
                 "=" => Symbol("Prelude.areEqual"),
+                // These ones *probably* won't conflict with variables and might be passed as functions
+                "chooseRandom" => Symbol("Prelude.chooseRandom"),
                 // These ones *probably* won't conflict with variables and might commonly be used with (apply) because they are variadic
                 "concat" => Symbol("Prelude.concat"),
                 "zipKeep" => Symbol("Prelude.zipKeep"),

src/kiss/Prelude.hx

@@ -301,6 +301,10 @@ class Prelude {
         }
     }
 
+    public static function chooseRandom<T>(l:kiss.List<T>) {
+        return l[Std.random(l.length)];
+    }
+
     // Based on: http://old.haxe.org/doc/snip/memoize
     public static function memoize(func:Function, ?caller:Dynamic):Function {
         var argMap = new Map<String, Dynamic>();

src/test/cases/GenerativeTestCase.hx

@@ -0,0 +1,17 @@
+package test.cases;
+
+import kiss.Prelude;
+import kiss.List;
+import utest.Test;
+import utest.Assert;
+
+@:build(kiss.Kiss.build())
+class GenerativeTestCase extends Test {
+    function testTruthy() {
+        _testTruthy();
+    }
+
+    function testFalsy() {
+        _testFalsy();
+    }
+}

src/test/cases/GenerativeTestCase.kiss

@@ -0,0 +1,55 @@
+(defMacroVar maxInt 1000000000)
+(defMacroVar maxStringLength 20)
+(defMacroVar maxExps 4)
+
+(defMacroFunction _macroList [func length]
+    ~(for _ (range length) (func)))
+
+(defMacro macroRepeat [exp length]
+    `(begin ,@(_macroList ->{exp} (eval length))))
+
+(defMacroFunction _randomLengthMacroList [func]
+    (_macroList func (+ 2 (random (- maxExps 2)))))
+
+(defMacroFunction _randomLetterString []
+    (ReaderExp.StrExp (apply + (for _ (range (random maxStringLength)) (chooseRandom (.split "abcdefghijklmnopqrstuvwxyz" ""))))))
+
+(defMacroFunction _randomFalsyExp []
+    ((chooseRandom
+        [
+            ->{`null}
+            ->{`false}
+            ->{`""}
+            ->{`[]}
+            ->{`(or ,@(_randomLengthMacroList _randomFalsyExp))}
+            ->{`(and
+                    ,@(_randomLengthMacroList _randomUncertainExp)
+                    (_randomFalsyExp)
+                    ,@(_randomLengthMacroList _randomUncertainExp))}
+        ])))
+(defMacro randomFalsyExp []
+    ~(_randomFalsyExp))
+
+(defMacroFunction _randomTruthyExp []
+    ((chooseRandom
+        [
+            ->{`true}
+            ->{(_randomLetterString)}
+        ])))
+(defMacro randomTruthyExp []
+    ~(_randomTruthyExp))
+
+(defMacroFunction _randomUncertainExp []
+    ((chooseRandom
+        [
+            ->(_randomFalsyExp)
+            ->(_randomTruthyExp)
+        ])))
+(defMacro randomUncertainExp []
+    ~(_randomUncertainExp))
+
+(function _testTruthy []
+    (macroRepeat (Assert.isTrue ?(randomTruthyExp)) maxExps))
+
+(function _testFalsy []
+    (macroRepeat (Assert.isFalse ?(randomFalsyExp)) maxExps))