fix(python): classes do not correctly implement interfaces

packages/@jsii/python-runtime/tests/test_python.py

@@ -1,8 +1,10 @@
 import jsii
 import pytest
+from typing import Any, cast
 
 from jsii.errors import JSIIError
 import jsii_calc
+from jsii_calc.module2702 import IVpc, Vpc, IBaz, Baz
 
 
 class TestErrorHandling:
@@ -27,8 +29,24 @@ def test_descriptive_error_when_passing_function(self):
         obj = jsii_calc.Calculator()
 
         with pytest.raises(JSIIError, match="Cannot pass function as argument here.*"):
+            # types: ignore
             obj.add(self.test_descriptive_error_when_passing_function)
 
+    def test_implements_interface(self) -> None:
+        """Checks that jsii-generated classes correctly implement the relevant jsii-generated interfaces."""
+
+        def vpc_interface_func(v: IVpc) -> None:
+            assert v is not None
+
+        vpc = Vpc()
+        vpc_interface_func(vpc)
+
+        def baz_interface_func(b: IBaz) -> None:
+            assert b is not None
+
+        baz = Baz()
+        baz_interface_func(baz)
+
 
 def find_struct_bases(x):
     ret = []

packages/jsii-calc/lib/module2702/index.ts

@@ -30,3 +30,45 @@ export class Class3 implements IBaseInterface {
 export interface IFoo extends IBaseInterface {
   readonly iBaseInterface: string;
 }
+
+// See https://github.com/aws/aws-cdk/issues/13474
+
+export interface IConstruct {
+  constructMethod(): void;
+}
+
+export interface IResource extends IConstruct {
+  resourceMethod(): void;
+}
+
+export interface IVpc extends IResource {
+  vpcMethod(): void;
+}
+
+export class Construct implements IConstruct {
+  public constructMethod(): void {
+    return;
+  }
+}
+
+export abstract class Resource extends Construct implements IResource {
+  public resourceMethod(): void {
+    return;
+  }
+}
+
+export class Vpc extends Resource implements IVpc {
+  public vpcMethod(): void {
+    return;
+  }
+}
+
+export interface IBaz extends IBaseInterface {
+  bazMethod(): void;
+}
+
+export class Baz extends Class3 implements IBaz {
+  public bazMethod(): void {
+    return;
+  }
+}

packages/jsii-calc/test/assembly.jsii

@@ -14968,6 +14968,42 @@
         }
       ]
     },
+    "jsii-calc.module2702.Baz": {
+      "assembly": "jsii-calc",
+      "base": "jsii-calc.module2702.Class3",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.Baz",
+      "initializer": {
+        "docs": {
+          "stability": "stable"
+        }
+      },
+      "interfaces": [
+        "jsii-calc.module2702.IBaz"
+      ],
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 70
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 71
+          },
+          "name": "bazMethod",
+          "overrides": "jsii-calc.module2702.IBaz"
+        }
+      ],
+      "name": "Baz",
+      "namespace": "module2702"
+    },
     "jsii-calc.module2702.Class1": {
       "assembly": "jsii-calc",
       "base": "@scope/jsii-calc-base.Base",
@@ -15084,6 +15120,98 @@
       "name": "Class3",
       "namespace": "module2702"
     },
+    "jsii-calc.module2702.Construct": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.Construct",
+      "initializer": {
+        "docs": {
+          "stability": "stable"
+        }
+      },
+      "interfaces": [
+        "jsii-calc.module2702.IConstruct"
+      ],
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 48
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 49
+          },
+          "name": "constructMethod",
+          "overrides": "jsii-calc.module2702.IConstruct"
+        }
+      ],
+      "name": "Construct",
+      "namespace": "module2702"
+    },
+    "jsii-calc.module2702.IBaz": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.IBaz",
+      "interfaces": [
+        "@scope/jsii-calc-base.IBaseInterface"
+      ],
+      "kind": "interface",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 66
+      },
+      "methods": [
+        {
+          "abstract": true,
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 67
+          },
+          "name": "bazMethod"
+        }
+      ],
+      "name": "IBaz",
+      "namespace": "module2702"
+    },
+    "jsii-calc.module2702.IConstruct": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.IConstruct",
+      "kind": "interface",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 36
+      },
+      "methods": [
+        {
+          "abstract": true,
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 37
+          },
+          "name": "constructMethod"
+        }
+      ],
+      "name": "IConstruct",
+      "namespace": "module2702"
+    },
     "jsii-calc.module2702.IFoo": {
       "assembly": "jsii-calc",
       "docs": {
@@ -15118,6 +15246,139 @@
         }
       ]
     },
+    "jsii-calc.module2702.IResource": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.IResource",
+      "interfaces": [
+        "jsii-calc.module2702.IConstruct"
+      ],
+      "kind": "interface",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 40
+      },
+      "methods": [
+        {
+          "abstract": true,
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 41
+          },
+          "name": "resourceMethod"
+        }
+      ],
+      "name": "IResource",
+      "namespace": "module2702"
+    },
+    "jsii-calc.module2702.IVpc": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.IVpc",
+      "interfaces": [
+        "jsii-calc.module2702.IResource"
+      ],
+      "kind": "interface",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 44
+      },
+      "methods": [
+        {
+          "abstract": true,
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 45
+          },
+          "name": "vpcMethod"
+        }
+      ],
+      "name": "IVpc",
+      "namespace": "module2702"
+    },
+    "jsii-calc.module2702.Resource": {
+      "abstract": true,
+      "assembly": "jsii-calc",
+      "base": "jsii-calc.module2702.Construct",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.Resource",
+      "initializer": {
+        "docs": {
+          "stability": "stable"
+        }
+      },
+      "interfaces": [
+        "jsii-calc.module2702.IResource"
+      ],
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 54
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 55
+          },
+          "name": "resourceMethod",
+          "overrides": "jsii-calc.module2702.IResource"
+        }
+      ],
+      "name": "Resource",
+      "namespace": "module2702"
+    },
+    "jsii-calc.module2702.Vpc": {
+      "assembly": "jsii-calc",
+      "base": "jsii-calc.module2702.Resource",
+      "docs": {
+        "stability": "stable"
+      },
+      "fqn": "jsii-calc.module2702.Vpc",
+      "initializer": {
+        "docs": {
+          "stability": "stable"
+        }
+      },
+      "interfaces": [
+        "jsii-calc.module2702.IVpc"
+      ],
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/module2702/index.ts",
+        "line": 60
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "stable"
+          },
+          "locationInModule": {
+            "filename": "lib/module2702/index.ts",
+            "line": 61
+          },
+          "name": "vpcMethod",
+          "overrides": "jsii-calc.module2702.IVpc"
+        }
+      ],
+      "name": "Vpc",
+      "namespace": "module2702"
+    },
     "jsii-calc.nodirect.sub1.TypeFromSub1": {
       "assembly": "jsii-calc",
       "docs": {
@@ -15874,5 +16135,5 @@
     }
   },
   "version": "3.20.120",
-  "fingerprint": "ezY52AR44agRJClz62BLSJU4fF1Dhh+7vRL5LX9Fcgc="
+  "fingerprint": "Ouku0wagXKUVN9v9Ud7ocXYRaRl10KuCazRDvU/7iNk="
 }