C#: Add some string interpolation tests with alignment and formatting.

Author: michaelnebel

csharp/ql/test/library-tests/stringinterpolation/StringInterpolation.cs

@@ -0,0 +1,17 @@
+using System;
+
+public class MyStringInterpolationClass
+{
+
+    public void M()
+    {
+        float i = 3.14159f;
+        const int align = 5;
+        var x1 = $"Hello, Pi {i}";
+        var x2 = $"Hello, Pi {i:F1}";
+        var x3 = $"Hello, Pi {i,6}";
+        var x4 = $"Hello, Pi {i,6:F3}";
+        var x5 = $"Hello, Pi {i,align}";
+        var x6 = $"Hello, Pi {i,align:F2}";
+    }
+}

csharp/ql/test/library-tests/stringinterpolation/options

@@ -0,0 +1,2 @@
+semmle-extractor-options: /nostdlib /noconfig
+semmle-extractor-options: --load-sources-from-project:${testdir}/../../resources/stubs/_frameworks/Microsoft.NETCore.App/Microsoft.NETCore.App.csproj

csharp/ql/test/library-tests/stringinterpolation/stringInterpolation.expected

@@ -0,0 +1,23 @@
+inserts
+| StringInterpolation.cs:10:18:10:33 | $"..." | StringInterpolation.cs:10:31:10:31 | access to local variable i |
+| StringInterpolation.cs:11:18:11:36 | $"..." | StringInterpolation.cs:11:31:11:31 | access to local variable i |
+| StringInterpolation.cs:12:18:12:35 | $"..." | StringInterpolation.cs:12:31:12:31 | access to local variable i |
+| StringInterpolation.cs:13:18:13:38 | $"..." | StringInterpolation.cs:13:31:13:31 | access to local variable i |
+| StringInterpolation.cs:14:18:14:39 | $"..." | StringInterpolation.cs:14:31:14:31 | access to local variable i |
+| StringInterpolation.cs:15:18:15:42 | $"..." | StringInterpolation.cs:15:31:15:31 | access to local variable i |
+texts
+| StringInterpolation.cs:10:18:10:33 | $"..." | StringInterpolation.cs:10:20:10:29 | "Hello, Pi " |
+| StringInterpolation.cs:11:18:11:36 | $"..." | StringInterpolation.cs:11:20:11:29 | "Hello, Pi " |
+| StringInterpolation.cs:12:18:12:35 | $"..." | StringInterpolation.cs:12:20:12:29 | "Hello, Pi " |
+| StringInterpolation.cs:13:18:13:38 | $"..." | StringInterpolation.cs:13:20:13:29 | "Hello, Pi " |
+| StringInterpolation.cs:14:18:14:39 | $"..." | StringInterpolation.cs:14:20:14:29 | "Hello, Pi " |
+| StringInterpolation.cs:15:18:15:42 | $"..." | StringInterpolation.cs:15:20:15:29 | "Hello, Pi " |
+interpolationInsertsWithAlign
+| StringInterpolation.cs:12:18:12:35 | $"..." | StringInterpolation.cs:12:31:12:31 | access to local variable i | StringInterpolation.cs:12:33:12:33 | 6 |
+| StringInterpolation.cs:13:18:13:38 | $"..." | StringInterpolation.cs:13:31:13:31 | access to local variable i | StringInterpolation.cs:13:33:13:33 | 6 |
+| StringInterpolation.cs:14:18:14:39 | $"..." | StringInterpolation.cs:14:31:14:31 | access to local variable i | StringInterpolation.cs:14:33:14:37 | access to local variable align |
+| StringInterpolation.cs:15:18:15:42 | $"..." | StringInterpolation.cs:15:31:15:31 | access to local variable i | StringInterpolation.cs:15:33:15:37 | access to local variable align |
+interpolationInsertsWithFormat
+| StringInterpolation.cs:11:18:11:36 | $"..." | StringInterpolation.cs:11:31:11:31 | access to local variable i | StringInterpolation.cs:11:32:11:34 | "F1" |
+| StringInterpolation.cs:13:18:13:38 | $"..." | StringInterpolation.cs:13:31:13:31 | access to local variable i | StringInterpolation.cs:13:34:13:36 | "F3" |
+| StringInterpolation.cs:15:18:15:42 | $"..." | StringInterpolation.cs:15:31:15:31 | access to local variable i | StringInterpolation.cs:15:38:15:40 | "F2" |

csharp/ql/test/library-tests/stringinterpolation/stringInterpolation.ql

@@ -0,0 +1,25 @@
+import csharp
+
+query predicate inserts(InterpolatedStringExpr expr, Expr e) {
+  expr.getAnInsert() = e // and inSpecificSource(expr)
+}
+
+query predicate texts(InterpolatedStringExpr expr, StringLiteral literal) {
+  expr.getAText() = literal // and inSpecificSource(expr)
+}
+
+query predicate interpolationInsertsWithAlign(InterpolatedStringExpr expr, Expr insert, Expr align) {
+  exists(InterpolatedStringInsertExpr e | expr.getInterpolatedInsert(_) = e |
+    insert = e.getInsert() and
+    align = e.getAlignment()
+  )
+}
+
+query predicate interpolationInsertsWithFormat(
+  InterpolatedStringExpr expr, Expr insert, StringLiteral format
+) {
+  exists(InterpolatedStringInsertExpr e | expr.getInterpolatedInsert(_) = e |
+    insert = e.getInsert() and
+    format = e.getFormat()
+  )
+}