Add analyzer tests to switch statements

analyzer/control-flow_test.go

@@ -100,6 +100,78 @@ U: (| Int F64 UInt)
 `)
 }
 
+func TestSwitch (test *testing.T) {
+testString (test,
+`
+[switch x:Int]:Int = switch x
+	| 0 5
+	| 1 4
+	| 2 3
+	* 0
+`)
+}
+
+func TestSwitchReturn (test *testing.T) {
+testString (test,
+`
+[is5 x:Int]:Bool = {
+	switch x | 5 [return true]
+	false
+}
+`)
+}
+
+func TestSwitchReturnValueUsed (test *testing.T) {
+testString (test,
+`
+[is5 x:Int]:Bool = switch x
+	| 5 [return true]
+	* false
+`)
+}
+
+func TestSwitchErrBadLiteral (test *testing.T) {
+testStringErr (test,
+"cannot use array literal as Int", 4, 4,
+`
+[switch x:Int]:Int = switch x
+	| 0 5
+	| (1) 4
+	| 2 3
+	* 0
+`)
+}
+
+func TestSwitchErrNotConstant (test *testing.T) {
+testStringErr (test,
+"y cannot represent a constant integer", 7, 4,
+`
+[switch x:Int]:Int = {
+	y:Int = 1
+
+	switch x
+	| 0 5
+	| y 4
+	| 2 3
+	* 0
+}
+`)
+}
+
+func TestSwitchErrDuplicate (test *testing.T) {
+testStringErr (test,
+"65 already listed in match at stream0.fspl:6:2", 7, 4,
+`
+[switch x:I8]:Int = switch x
+	| 0   5
+	| 1   4
+	| 2   3
+	| 65  2
+	| 'A' 1
+	* 0
+`)
+}
+
 func TestIfElseReturnValueUsed (test *testing.T) {
 testString (test,
 `