Add pending test support to two-fer (#149)

exercises/practice/two-fer/two-fer-test.arr

@@ -2,14 +2,40 @@ use context essentials2020
 
 include file("two-fer.arr")
 
-check "no name given":
-  two-fer("") is "One for you, one for me."
+#|
+  When working offline, all tests except the first one are skipped by default.
+  Once you get the first test running, unskip the next one until all tests pass locally.
+  Check the block comment below for further details.
+|#
+
+fun no-name-given():
+  check "no name given":
+    two-fer("") is "One for you, one for me."
+  end
 end
 
-check "a name given":
-  two-fer("Alice") is "One for Alice, one for me."
+fun a-name-given():
+  check "a name given":
+    two-fer("Alice") is "One for Alice, one for me."
+  end
 end
 
-check "another name given":
-  two-fer("Bob") is "One for Bob, one for me."
+fun another-name-given():
+  check "another name given":
+    two-fer("Bob") is "One for Bob, one for me."
+  end
 end
+
+#|
+  Code to run each test. Each line corresponds to a test above and whether it should be run.
+  To mark a test to be run, replace `false` with `true` on that same line after the comma.
+  test(test-a, true) will be run. test(test-a, false) will be skipped.
+|#
+
+data TestRun: test(run, active) end
+
+[list: 
+  test(no-name-given, true),
+  test(a-name-given, false),
+  test(another-name-given, false)
+].each(lam(t): when t.active: t.run() end end)

exercises/practice/two-fer/two-fer.arr

@@ -3,5 +3,5 @@ use context essentials2020 # Don't delete this line when using Pyret on Exercism
 provide: two-fer end
 
 fun two-fer(name):
-  panic("Please implement the two-fer function")
+  raise("please implement the two-fer function")
 end