Don't add snapshot_kind: text to snapshots (#690)

This was extremely simple, sorry to leave it hanging.

Will do a self-review tomorrow to confirm I haven't missed anything

cargo-insta/tests/functional/main.rs

@@ -359,13 +359,12 @@ Hello, world!
     assert_snapshot!(test_current_insta.diff("src/snapshots/test_force_update_current__force_update.snap"), @r#"
     --- Original: src/snapshots/test_force_update_current__force_update.snap
     +++ Updated: src/snapshots/test_force_update_current__force_update.snap
-    @@ -1,8 +1,6 @@
+    @@ -1,8 +1,5 @@
     -
      ---
      source: src/lib.rs
     -expression: 
     +expression: "\"Hello, world!\""
-    +snapshot_kind: text
      ---
      Hello, world!
     -
@@ -763,6 +762,63 @@ Hidden snapshot
     );
 }
 
+#[test]
+fn test_snapshot_kind_behavior() {
+    let test_project = TestFiles::new()
+        .add_cargo_toml("test_snapshot_kind")
+        .add_file(
+            "src/lib.rs",
+            r#"
+#[test]
+fn test_snapshots() {
+    insta::assert_snapshot!("new snapshot");
+    insta::assert_snapshot!("existing snapshot");
+}
+"#
+            .to_string(),
+        )
+        .add_file(
+            "src/snapshots/test_snapshot_kind__existing.snap",
+            r#"---
+source: src/lib.rs
+expression: "\"existing snapshot\""
+snapshot_kind: text
+---
+existing snapshot
+"#
+            .to_string(),
+        )
+        .create_project();
+
+    // Run the test with --accept to create the new snapshot
+    let output = test_project
+        .insta_cmd()
+        .args(["test", "--accept"])
+        .output()
+        .unwrap();
+
+    assert!(output.status.success());
+
+    // Verify the new snapshot was created without snapshot_kind
+    let new_snapshot = std::fs::read_to_string(
+        test_project
+            .workspace_dir
+            .join("src/snapshots/test_snapshot_kind__snapshots.snap"),
+    )
+    .unwrap();
+
+    assert!(!new_snapshot.contains("snapshot_kind:"));
+
+    // Verify both snapshots work with --require-full-match
+    let output = test_project
+        .insta_cmd()
+        .args(["test", "--require-full-match"])
+        .output()
+        .unwrap();
+
+    assert!(output.status.success());
+}
+
 #[test]
 fn test_ignored_snapshots() {
     let test_project = TestFiles::new()

cargo-insta/tests/functional/workspace.rs

@@ -576,7 +576,6 @@ fn test_hello() {
     ---
     source: "../tests/lib.rs"
     expression: hello()
-    snapshot_kind: text
     ---
     Hello, world!
     "#);

insta/src/snapshot.rs

@@ -291,15 +291,13 @@ impl MetaData {
             fields.push(("input_file", Content::from(input_file)));
         }
 
-        let snapshot_type = Content::from(match self.snapshot_kind {
-            SnapshotKind::Text => "text",
+        match self.snapshot_kind {
+            SnapshotKind::Text => {}
             SnapshotKind::Binary { ref extension } => {
                 fields.push(("extension", Content::from(extension.clone())));
-                "binary"
+                fields.push(("snapshot_kind", Content::from("binary")));
             }
-        });
-
-        fields.push(("snapshot_kind", snapshot_type));
+        }
 
         Content::Struct("MetaData", fields)
     }