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Task/Test-a-function/Lasso/test-a-function.lasso

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+// Taken from the Lasso entry in Palindrome page
+define isPalindrome(text::string) => {
+
+    local(_text = string(#text)) // need to make copy to get rid of reference issues
+
+    #_text -> replace(regexp(`(?:$|\W)+`), -ignorecase)
+
+    local(reversed = string(#_text))
+    #reversed -> reverse
+
+    return #_text == #reversed
+}
+
+// The tests
+describe(::isPalindrome) => {
+    it(`throws an error when not passed a string`) => {
+        expect->error =>{
+            isPalindrome(43)
+        }
+    }
+
+    it(`returns true if the string is the same forward and backwords`) => {
+        expect(isPalindrome('abba'))
+    }
+
+    it(`returns false if the string is different forward and backwords`) => {
+        expect(not isPalindrome('aab'))
+    }
+
+    it(`ignores spaces and punctuation`) => {
+        expect(isPalindrome(`Madam, I'm Adam`))
+    }
+}
+
+// Run the tests and get the summary
+// (This normally isn't in the code as the test suite is run via command-line.)
+lspec->stop