cmd/go: make pattern matching tests less repetitive

Change-Id: I25db1d637dd461cec67ba70659d523b46895c113
Reviewed-on: https://go-review.googlesource.com/38744Reviewed-by: Alan Donovan <adonovan@google.com>

src/cmd/go/internal/load/match_test.go

@@ -4,60 +4,75 @@
 
 package load
 
-import "testing"
-
-var matchPatternTests = []stringPairTest{
-	{"...", "foo", true},
-	{"net", "net", true},
-	{"net", "net/http", false},
-	{"net/http", "net", false},
-	{"net/http", "net/http", true},
-	{"net...", "netchan", true},
-	{"net...", "net", true},
-	{"net...", "net/http", true},
-	{"net...", "not/http", false},
-	{"net/...", "netchan", false},
-	{"net/...", "net", true},
-	{"net/...", "net/http", true},
-	{"net/...", "not/http", false},
-}
+import (
+	"strings"
+	"testing"
+)
+
+var matchPatternTests = `
+	pattern ...
+	match foo
+	
+	pattern net
+	match net
+	not net/http
+	
+	pattern net/http
+	match net/http
+	not net
+	
+	pattern net...
+	match net net/http netchan
+	not not/http not/net/http
+	
+	pattern net/...
+	match net net/http
+	not not/http not/net/http netchan
+`
 
 func TestMatchPattern(t *testing.T) {
-	testStringPairs(t, "matchPattern", matchPatternTests, func(pattern, name string) bool {
+	testPatterns(t, "matchPattern", matchPatternTests, func(pattern, name string) bool {
 		return matchPattern(pattern)(name)
 	})
 }
 
-var treeCanMatchPatternTests = []stringPairTest{
-	{"...", "foo", true},
-	{"net", "net", true},
-	{"net", "net/http", false},
-	{"net/http", "net", true},
-	{"net/http", "net/http", true},
-	{"net...", "netchan", true},
-	{"net...", "net", true},
-	{"net...", "net/http", true},
-	{"net...", "not/http", false},
-	{"net/...", "netchan", false},
-	{"net/...", "net", true},
-	{"net/...", "net/http", true},
-	{"net/...", "not/http", false},
-	{"abc.../def", "abcxyz", true},
-	{"abc.../def", "xyxabc", false},
-	{"x/y/z/...", "x", true},
-	{"x/y/z/...", "x/y", true},
-	{"x/y/z/...", "x/y/z", true},
-	{"x/y/z/...", "x/y/z/w", true},
-	{"x/y/z", "x", true},
-	{"x/y/z", "x/y", true},
-	{"x/y/z", "x/y/z", true},
-	{"x/y/z", "x/y/z/w", false},
-	{"x/.../y/z", "x/a/b/c", true},
-	{"x/.../y/z", "y/x/a/b/c", false},
-}
+var treeCanMatchPatternTests = `
+	pattern ...
+	match foo
+	
+	pattern net
+	match net
+	not net/http
+	
+	pattern net/http
+	match net net/http
+	
+	pattern net...
+	match net netchan net/http
+	not not/http not/net/http
+
+	pattern net/...
+	match net net/http
+	not not/http netchan
+	
+	pattern abc.../def
+	match abcxyz
+	not xyzabc
 	
-func TestChildrenCanMatchPattern(t *testing.T) {
-	testStringPairs(t, "treeCanMatchPattern", treeCanMatchPatternTests, func(pattern, name string) bool {
+	pattern x/y/z/...
+	match x x/y x/y/z x/y/z/w
+	
+	pattern x/y/z
+	match x x/y x/y/z
+	not x/y/z/w
+	
+	pattern x/.../y/z
+	match x/a/b/c
+	not y/x/a/b/c
+`
+
+func TestTreeCanMatchPattern(t *testing.T) {
+	testPatterns(t, "treeCanMatchPattern", treeCanMatchPatternTests, func(pattern, name string) bool {
 		return treeCanMatchPattern(pattern)(name)
 	})
 }
@@ -86,3 +101,31 @@ func testStringPairs(t *testing.T, name string, tests []stringPairTest, f func(s
 		}
 	}
 }
+
+func testPatterns(t *testing.T, name, tests string, fn func(string, string) bool) {
+	var patterns []string
+	for _, line := range strings.Split(tests, "\n") {
+		if i := strings.Index(line, "#"); i >= 0 {
+			line = line[:i]
+		}
+		f := strings.Fields(line)
+		if len(f) == 0 {
+			continue
+		}
+		switch f[0] {
+		default:
+			t.Fatalf("unknown directive %q", f[0])
+		case "pattern":
+			patterns = f[1:]
+		case "match", "not":
+			want := f[0] == "match"
+			for _, pattern := range patterns {
+				for _, in := range f[1:] {
+					if fn(pattern, in) != want {
+						t.Errorf("%s(%q, %q) = %v, want %v", name, pattern, in, !want, want)
+					}
+				}
+			}
+		}
+	}
+}