Add testcases with functions.

powershell/ql/test/library-tests/controlflow/graph/Cfg.expected

@@ -1,3 +1,86 @@
+functions.ps1:
+#    1| enter functions.ps1
+#-----|  -> functions.ps1
+
+#    1| functions.ps1
+
+#    1| enter {...}
+#-----|  -> {...}
+
+#    1| {...}
+
+#   11| enter {...}
+#-----|  -> {...}
+
+#   11| exit {...}
+
+#   11| exit {...} (normal)
+#-----|  -> exit {...}
+
+#   11| {...}
+#-----|  -> {...}
+
+#   11| {...}
+#-----|  -> exit {...} (normal)
+
+#   13| enter {...}
+#-----|  -> {...}
+
+#   13| {...}
+
+#   22| enter {...}
+#-----|  -> {...}
+
+#   22| {...}
+#-----|  -> sum
+
+#   28| sum
+#-----|  -> 0
+
+#   28| ...=...
+
+#   28| 0
+#-----|  -> ...=...
+
+#   28| 0
+#-----|  -> 0
+
+#   36| enter {...}
+#-----|  -> {...}
+
+#   36| {...}
+#-----|  -> sum
+
+#   41| {...}
+#-----|  -> sum
+
+#   42| sum
+#-----|  -> 0
+
+#   42| ...=...
+#-----|  -> {...}
+
+#   42| 0
+#-----|  -> ...=...
+
+#   42| 0
+#-----|  -> 0
+
+#   44| {...}
+#-----|  -> sum
+
+#   46| sum
+#-----|  -> _
+
+#   46| ...=...
+#-----|  -> {...}
+
+#   46| _
+#-----|  -> ...=...
+
+#   46| _
+#-----|  -> _
+
 global.ps1:
 #    1| {...}
 #-----|  -> c

powershell/ql/test/library-tests/controlflow/graph/functions.ps1

@@ -0,0 +1,53 @@
+Function Add-Numbers-Arguments {
+    # We take in two numbers
+    param(
+        [int] $number1,
+        [int] $number2
+    )
+    # We add them together
+    $number1 + $number2
+}
+
+function foo() { param($a) }
+
+Function Default-Arguments {
+    param(
+        [int] $name0,
+        [int] $name1 = 0,
+        [int] $name2 = $name1 + 1
+    )
+    $name + $name2
+}
+
+Function Add-Numbers-From-Array {
+    # We take in a list of numbers
+    param(
+        [int[]] $numbers
+    )
+    
+    $sum = 0
+    foreach ($number in $numbers) {
+        # We add each number to the sum
+        $sum += $number
+    }
+    $sum
+}
+
+Function Add-Numbers-From-Pipeline {
+    # We take in a list of numbers
+    param(
+        [int[]] $numbers
+    )
+    Begin {
+        $sum = 0
+    }
+    Process {
+        # We add each number to the sum
+        $sum += $_
+    }
+    End {
+        # We return the sum
+        $sum
+    }
+}
+