isogram: add test generator

exercises/isogram/.meta/gen.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"log"
+	"text/template"
+
+	"../../../gen"
+)
+
+func main() {
+	t, err := template.New("").Parse(tmpl)
+	if err != nil {
+		log.Fatal(err)
+	}
+	var j js
+	if err := gen.Gen("isogram", &j, t); err != nil {
+		log.Fatal(err)
+	}
+}
+
+// The JSON structure we expect to be able to unmarshal into
+type js struct {
+	Exercise string
+	Version  string
+	Cases    []struct {
+		Description string
+		Cases       []oneCase
+	}
+}
+
+// Test cases
+type oneCase struct {
+	Description string
+	Property    string
+	Input       string
+	Expected    bool
+}
+
+// Template to generate test cases.
+var tmpl = `package isogram
+
+{{.Header}}
+
+var testCases = []struct {
+	description	string
+	input		string
+	expected	bool
+}{ {{range .J.Cases}} {{range .Cases}}
+{
+	description:	{{printf "%q"  .Description}},
+	input:		{{printf "%q"  .Input}},
+	expected:	{{printf "%t"  .Expected}},
+},{{end}}{{end}}
+}
+`

exercises/isogram/cases_test.go

@@ -0,0 +1,57 @@
+package isogram
+
+// Source: exercism/problem-specifications
+// Commit: f9e0ebb isogram: Update canonical-data.json as in #919 (#920)
+// Problem Specifications Version: 1.2.0
+
+var testCases = []struct {
+	description string
+	input       string
+	expected    bool
+}{
+	{
+		description: "empty string",
+		input:       "",
+		expected:    true,
+	},
+	{
+		description: "isogram with only lower case characters",
+		input:       "isogram",
+		expected:    true,
+	},
+	{
+		description: "word with one duplicated character",
+		input:       "eleven",
+		expected:    false,
+	},
+	{
+		description: "longest reported english isogram",
+		input:       "subdermatoglyphic",
+		expected:    true,
+	},
+	{
+		description: "word with duplicated character in mixed case",
+		input:       "Alphabet",
+		expected:    false,
+	},
+	{
+		description: "hypothetical isogrammic word with hyphen",
+		input:       "thumbscrew-japingly",
+		expected:    true,
+	},
+	{
+		description: "isogram with duplicated hyphen",
+		input:       "six-year-old",
+		expected:    true,
+	},
+	{
+		description: "made-up name that is an isogram",
+		input:       "Emily Jung Schwartzkopf",
+		expected:    true,
+	},
+	{
+		description: "duplicated character in the middle",
+		input:       "accentor",
+		expected:    false,
+	},
+}

exercises/isogram/isogram_test.go

@@ -2,29 +2,13 @@ package isogram
 
 import "testing"
 
-var testCases = []struct {
-	word     string
-	expected bool
-}{
-	{"duplicates", true},
-	{"eleven", false},
-	{"subdermatoglyphic", true},
-	{"Alphabet", false},
-	{"thumbscrew-japingly", true},
-	{"Hjelmqvist-Gryb-Zock-Pfund-Wax", true},
-	{"Heizölrückstoßabdämpfung", true},
-	{"the quick brown fox", false},
-	{"Emily Jung Schwartzkopf", true},
-	{"éléphant", false},
-}
-
 func TestIsIsogram(t *testing.T) {
 	for _, c := range testCases {
-		if IsIsogram(c.word) != c.expected {
-			t.Fatalf("FAIL: Word %q, expected %v, got %v", c.word, c.expected, !c.expected)
+		if IsIsogram(c.input) != c.expected {
+			t.Fatalf("FAIL: %s\nWord %q, expected %t, got %t", c.description, c.input, c.expected, !c.expected)
 		}
 
-		t.Logf("PASS: Word %q", c.word)
+		t.Logf("PASS: Word %q", c.input)
 	}
 }
 
@@ -34,7 +18,7 @@ func BenchmarkIsIsogram(b *testing.B) {
 		b.StartTimer()
 
 		for i := 0; i < b.N; i++ {
-			IsIsogram(c.word)
+			IsIsogram(c.input)
 		}
 
 		b.StopTimer()