re-add snapshot tests (#76)

Accidentally dropped it when doing the repo structure cleanup in
#68.....

tests/composition_tests.rs

@@ -0,0 +1,185 @@
+mod subgraph;
+
+#[cfg(test)]
+mod tests {
+    use apollo_compiler::Schema;
+    use apollo_federation::subgraph::Subgraph;
+    use apollo_federation::Supergraph;
+
+    fn print_sdl(schema: &Schema) -> String {
+        let mut schema = schema.clone();
+        schema.types.sort_keys();
+        schema.directive_definitions.sort_keys();
+        schema.to_string()
+    }
+
+    #[test]
+    fn can_compose_supergraph() {
+        let s1 = Subgraph::parse_and_expand(
+            "Subgraph1",
+            "https://subgraph1",
+            r#"
+                type Query {
+                  t: T
+                }
+
+                type T @key(fields: "k") {
+                  k: ID
+                }
+
+                type S {
+                  x: Int
+                }
+
+                union U = S | T
+            "#,
+        )
+        .unwrap();
+        let s2 = Subgraph::parse_and_expand(
+            "Subgraph2",
+            "https://subgraph2",
+            r#"
+                type T @key(fields: "k") {
+                  k: ID
+                  a: Int
+                  b: String
+                }
+
+                enum E {
+                  V1
+                  V2
+                }
+            "#,
+        )
+        .unwrap();
+
+        let supergraph = Supergraph::compose(vec![&s1, &s2]).unwrap();
+        insta::assert_snapshot!(print_sdl(&supergraph.schema));
+        insta::assert_snapshot!(print_sdl(&supergraph.to_api_schema()));
+    }
+
+    #[test]
+    fn can_compose_with_descriptions() {
+        let s1 = Subgraph::parse_and_expand(
+            "Subgraph1",
+            "https://subgraph1",
+            r#"
+                "The foo directive description"
+                directive @foo(url: String) on FIELD
+
+                "A cool schema"
+                schema {
+                  query: Query
+                }
+
+                """
+                Available queries
+                Not much yet
+                """
+                type Query {
+                  "Returns tea"
+                  t(
+                    "An argument that is very important"
+                    x: String!
+                  ): String
+                }
+            "#,
+        )
+        .unwrap();
+
+        let s2 = Subgraph::parse_and_expand(
+            "Subgraph2",
+            "https://subgraph2",
+            r#"
+                "The foo directive description"
+                directive @foo(url: String) on FIELD
+
+                "An enum"
+                enum E {
+                  "The A value"
+                  A
+                  "The B value"
+                  B
+                }
+            "#,
+        )
+        .unwrap();
+
+        let supergraph = Supergraph::compose(vec![&s1, &s2]).unwrap();
+        insta::assert_snapshot!(print_sdl(&supergraph.schema));
+        insta::assert_snapshot!(print_sdl(&supergraph.to_api_schema()));
+    }
+
+    #[test]
+    fn can_compose_types_from_different_subgraphs() {
+        let s1 = Subgraph::parse_and_expand(
+            "SubgraphA",
+            "https://subgraphA",
+            r#"
+                type Query {
+                    products: [Product!]
+                }
+
+                type Product {
+                    sku: String!
+                    name: String!
+                }
+            "#,
+        )
+        .unwrap();
+
+        let s2 = Subgraph::parse_and_expand(
+            "SubgraphB",
+            "https://subgraphB",
+            r#"
+                type User {
+                    name: String
+                    email: String!
+                }
+            "#,
+        )
+        .unwrap();
+        let supergraph = Supergraph::compose(vec![&s1, &s2]).unwrap();
+        insta::assert_snapshot!(print_sdl(&supergraph.schema));
+        insta::assert_snapshot!(print_sdl(&supergraph.to_api_schema()));
+    }
+
+    #[test]
+    fn compose_removes_federation_directives() {
+        let s1 = Subgraph::parse_and_expand(
+            "SubgraphA",
+            "https://subgraphA",
+            r#"
+                extend schema @link(url: "https://specs.apollo.dev/federation/v2.5", import: [ "@key", "@provides", "@external" ])
+
+                type Query {
+                  products: [Product!] @provides(fields: "name")
+                }
+
+                type Product @key(fields: "sku") {
+                  sku: String!
+                  name: String! @external
+                }
+            "#,
+        )
+            .unwrap();
+
+        let s2 = Subgraph::parse_and_expand(
+            "SubgraphB",
+            "https://subgraphB",
+            r#"
+                extend schema @link(url: "https://specs.apollo.dev/federation/v2.5", import: [ "@key", "@shareable" ])
+
+                type Product @key(fields: "sku") {
+                  sku: String!
+                  name: String! @shareable
+                }
+            "#,
+        )
+            .unwrap();
+
+        let supergraph = Supergraph::compose(vec![&s1, &s2]).unwrap();
+        insta::assert_snapshot!(print_sdl(&supergraph.schema));
+        insta::assert_snapshot!(print_sdl(&supergraph.to_api_schema()));
+    }
+}

tests/snapshots/composition_tests__tests__can_compose_supergraph-2.snap

@@ -0,0 +1,25 @@
+---
+source: apollo-federation/tests/composition_tests.rs
+expression: print_sdl(&supergraph.to_api_schema())
+---
+enum E {
+  V1
+  V2
+}
+
+type Query {
+  t: T
+}
+
+type S {
+  x: Int
+}
+
+type T {
+  k: ID
+  a: Int
+  b: String
+}
+
+union U = S | T
+

tests/snapshots/composition_tests__tests__can_compose_supergraph.snap

@@ -0,0 +1,59 @@
+---
+source: apollo-federation/tests/composition_tests.rs
+expression: print_sdl(&supergraph.schema)
+---
+schema @link(url: "https://specs.apollo.dev/link/v1.0") @link(url: "https://specs.apollo.dev/join/v0.3", for: EXECUTION) {
+  query: Query
+}
+
+directive @join__enumValue(graph: join__Graph!) repeatable on ENUM_VALUE
+
+directive @join__field(graph: join__Graph, requires: join__FieldSet, provides: join__FieldSet, type: String, external: Boolean, override: String, usedOverridden: Boolean) repeatable on FIELD_DEFINITION | INPUT_FIELD_DEFINITION
+
+directive @join__graph(name: String!, url: String!) on ENUM_VALUE
+
+directive @join__implements(graph: join__Graph!, interface: String!) repeatable on INTERFACE | OBJECT
+
+directive @join__type(graph: join__Graph!, key: join__FieldSet, extension: Boolean! = false, resolvable: Boolean! = true, isInterfaceObject: Boolean! = false) repeatable on ENUM | INPUT_OBJECT | INTERFACE | OBJECT | SCALAR | UNION
+
+directive @join__unionMember(graph: join__Graph!, member: String!) repeatable on UNION
+
+directive @link(url: String, as: String, for: link__Purpose, import: [link__Import]) repeatable on SCHEMA
+
+enum E @join__type(graph: SUBGRAPH2) {
+  V1 @join__enumValue(graph: SUBGRAPH2)
+  V2 @join__enumValue(graph: SUBGRAPH2)
+}
+
+type Query @join__type(graph: SUBGRAPH1) @join__type(graph: SUBGRAPH2) {
+  t: T @join__field(graph: SUBGRAPH1)
+}
+
+type S @join__type(graph: SUBGRAPH1) {
+  x: Int
+}
+
+type T @join__type(graph: SUBGRAPH1, key: "k") @join__type(graph: SUBGRAPH2, key: "k") {
+  k: ID
+  a: Int @join__field(graph: SUBGRAPH2)
+  b: String @join__field(graph: SUBGRAPH2)
+}
+
+union U @join__type(graph: SUBGRAPH1) @join__unionMember(graph: SUBGRAPH1, member: "S") @join__unionMember(graph: SUBGRAPH1, member: "T") = S | T
+
+scalar join__FieldSet
+
+enum join__Graph {
+  SUBGRAPH1 @join__graph(name: "Subgraph1", url: "https://subgraph1")
+  SUBGRAPH2 @join__graph(name: "Subgraph2", url: "https://subgraph2")
+}
+
+scalar link__Import
+
+enum link__Purpose {
+  "SECURITY features provide metadata necessary to securely resolve fields."
+  SECURITY
+  "EXECUTION features provide metadata necessary for operation execution."
+  EXECUTION
+}
+

tests/snapshots/composition_tests__tests__can_compose_types_from_different_subgraphs-2.snap

@@ -0,0 +1,18 @@
+---
+source: apollo-federation/tests/composition_tests.rs
+expression: print_sdl(&supergraph.to_api_schema())
+---
+type Product {
+  sku: String!
+  name: String!
+}
+
+type Query {
+  products: [Product!]
+}
+
+type User {
+  name: String
+  email: String!
+}
+

tests/snapshots/composition_tests__tests__can_compose_types_from_different_subgraphs.snap

@@ -0,0 +1,52 @@
+---
+source: apollo-federation/tests/composition_tests.rs
+expression: print_sdl(&supergraph.schema)
+---
+schema @link(url: "https://specs.apollo.dev/link/v1.0") @link(url: "https://specs.apollo.dev/join/v0.3", for: EXECUTION) {
+  query: Query
+}
+
+directive @join__enumValue(graph: join__Graph!) repeatable on ENUM_VALUE
+
+directive @join__field(graph: join__Graph, requires: join__FieldSet, provides: join__FieldSet, type: String, external: Boolean, override: String, usedOverridden: Boolean) repeatable on FIELD_DEFINITION | INPUT_FIELD_DEFINITION
+
+directive @join__graph(name: String!, url: String!) on ENUM_VALUE
+
+directive @join__implements(graph: join__Graph!, interface: String!) repeatable on INTERFACE | OBJECT
+
+directive @join__type(graph: join__Graph!, key: join__FieldSet, extension: Boolean! = false, resolvable: Boolean! = true, isInterfaceObject: Boolean! = false) repeatable on ENUM | INPUT_OBJECT | INTERFACE | OBJECT | SCALAR | UNION
+
+directive @join__unionMember(graph: join__Graph!, member: String!) repeatable on UNION
+
+directive @link(url: String, as: String, for: link__Purpose, import: [link__Import]) repeatable on SCHEMA
+
+type Product @join__type(graph: SUBGRAPHA) {
+  sku: String!
+  name: String!
+}
+
+type Query @join__type(graph: SUBGRAPHA) @join__type(graph: SUBGRAPHB) {
+  products: [Product!] @join__field(graph: SUBGRAPHA)
+}
+
+type User @join__type(graph: SUBGRAPHB) {
+  name: String
+  email: String!
+}
+
+scalar join__FieldSet
+
+enum join__Graph {
+  SUBGRAPHA @join__graph(name: "SubgraphA", url: "https://subgraphA")
+  SUBGRAPHB @join__graph(name: "SubgraphB", url: "https://subgraphB")
+}
+
+scalar link__Import
+
+enum link__Purpose {
+  "SECURITY features provide metadata necessary to securely resolve fields."
+  SECURITY
+  "EXECUTION features provide metadata necessary for operation execution."
+  EXECUTION
+}
+

tests/snapshots/composition_tests__tests__can_compose_with_descriptions-2.snap

@@ -0,0 +1,26 @@
+---
+source: apollo-federation/tests/composition_tests.rs
+expression: print_sdl(&supergraph.to_api_schema())
+---
+"A cool schema"
+schema {
+  query: Query
+}
+
+"An enum"
+enum E {
+  "The A value"
+  A
+  "The B value"
+  B
+}
+
+"Available queries\nNot much yet"
+type Query {
+  "Returns tea"
+  t(
+    "An argument that is very important"
+    x: String!,
+  ): String
+}
+